CN108768571B - Method and device for frequency division multiplexing transmission of G.fast signal, VDSL2 signal and voice signal in copper wire - Google Patents
- ️Tue Sep 12 2023
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Publication number
- CN108768571B CN108768571B CN201810786144.2A CN201810786144A CN108768571B CN 108768571 B CN108768571 B CN 108768571B CN 201810786144 A CN201810786144 A CN 201810786144A CN 108768571 B CN108768571 B CN 108768571B Authority
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- pass filter
- frequency band
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/04—Frequency-transposition arrangements
- H04J1/045—Filters applied to frequency transposition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/12—Arrangements for reducing cross-talk between channels
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Telephonic Communication Services (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The invention provides a frequency division multiplexing transmission method of a G.fast signal, a VDSL2 signal and a voice signal in a copper wire, which comprises the following steps: A. selecting two adjacent signals in the frequency band in the G.fast signal, the VDSL2 signal and the voice signal to perform primary filtering and coupling to form a first mixed signal and an unselected single signal; B. and carrying out secondary filtering and coupling on the mixed signal and the independent signal to form a second mixed signal to be transmitted in a copper wire. Correspondingly, the frequency division multiplexing transmission device for the signals is also provided, and based on the broadband frequency band difference of the G.fast signal, the VDSL2 signal and the voice signal, the three signals are filtered and coupled twice in sequence, so that the signals are ensured to have no overlapping frequency bands and are not affected mutually. Therefore, the problem that the G.fast technology directly accesses the existing VDSL2 broadband network to cause mutual interference is solved, and the requirement of VDSL2 users for increasing the broadband access rate of copper wires is met.
Description
Technical Field
The invention relates to the technical field of network communication, in particular to a frequency division multiplexing transmission method and a frequency division multiplexing transmission device for G.fast signals, VDSL2 signals and voice signals in copper wires.
Background
Traditional copper wire networks are mainly voice services, early data services are provided by means of an audio dial-up Modem and an ISDN, and the limited access rate of the traditional copper wire networks is difficult to meet the increasing demand of data service bandwidth. With the popular application of ADSL, VDSL2, etc., the access rate is further increased from kbps to Mbps. The ADSL described above is an asymmetric digital subscriber line. The common telephone line is divided into three relatively independent channels of telephone, uplink data and downlink data by adopting the frequency division multiplexing technology, so that mutual interference is avoided. The user can make a call while surfing the Internet without worrying about the decrease of the Internet surfing rate and the call quality. And VDSL2 is a very high speed digital subscriber line. From a technical point of view, VDSL2 can actually be regarded as an upgrade of ADSL, whose average transmission rate can be 5 to 10 times higher than ADSL.
The network services that can be provided by broadband access have also evolved from low bandwidth applications such as the earliest electronic Bulletin Board System (BBS), web browsing, etc., to high bandwidth applications such as voice calls, video calls, high definition televisions, virtual reality, etc.
With The rise of emerging services such as OTT (Over-The-Top) video, 4K television, smart home, future cloud service age, etc., ultra wideband network construction is advancing. For new cells, fiber to the home (FTTH, fiber To The Home) is typically used. However, for mature cells, the construction progress is slow due to the complicated engineering such as wall-through wiring. The operator then considers how to move the fiber down the corridor or home entrance, with the last segment reusing the original access medium (especially conventional copper wire) to provide ultra-high speed broadband access. Operators want access rates up to giga because of the short access distance. As an alternative to FTTH, g.fast has been developed. Fast is a standardized proposal of the International Telecommunications Union (ITU) for the purpose of achieving speeds of optical fibers over copper wires of lengths not exceeding 250m, i.e. exceeding 1Gpbs. The high frequency band of G.fast will be 106MHz in the initial stage and can be extended to 212MHz in the future.
The fast signal can reuse the existing copper wire resources of the mature cell, and provides high-bandwidth access of the rival optical fiber of up to 1Gpbs on the traditional copper wire by utilizing wider frequency spectrum resources, thereby realizing faster access, faster deployment and faster benefit.
As shown in FIG. 5, the wideband frequency band of the voice signal is 0 Hz-f 1 The broadband frequency band of the VDSL2 signal is f 1 Hz～f 3 Hz. The VDSL2 signal occupies a limited frequency band width, and the copper wire broadband access rate is insufficient to meet the requirement of super applicationThe requirement is that. As shown in FIG. 6, the G.fast broadband frequency band is shown as f 2 Hz～f 4 Hz, where f 1 ＜f 2 ＜f 3 ＜f 4 . With the further expansion of the frequency band width of the G.fast signal, the broadband access rate of the copper wire has advanced into the Gpbs age, and a wide space is provided for more super applications. However, as can be easily seen by comparing fig. 5 and fig. 6, a part of the frequency bands used by the VDSL2 signal and the g.fast signal are overlapped, and direct access of the g.fast signal to the broadband environment of the existing VDSL2 signal copper wire tends to cause mutual interference between the two signals, so that the signals cannot be used.
Disclosure of Invention
The main purpose of the invention is to provide a frequency division multiplexing transmission method and device for G.fast signal, VDSL2 signal and voice signal in copper wire, which adopts frequency division filtering technology to overcome the defects in the prior art.
The method for frequency division multiplexing transmission of the G.fast signal, the VDSL2 signal and the voice signal in the copper wire comprises the following steps:
A. selecting two signals with adjacent frequency bands in the G.fast signal, the VDSL2 signal and the voice signal to perform primary coupling to form a first mixed signal and an unselected single signal;
in the primary coupling, high-pass filtering is carried out on a signal of a high frequency band in the two signals forming the first mixed signal, low-pass filtering is carried out on the other signal, and then the signal is multiplexed to the frequency band occupied by the first mixed signal;
B. performing secondary coupling on the two signals of the mixed signal and the single signal to form a second mixed signal for transmission in a copper wire;
in the secondary coupling, a high-pass filtering is performed on a signal in a high frequency band in the two signals forming the second mixed signal, and a low-pass filtering is performed on the other signal, and then the signal is multiplexed to the frequency band occupied by the second mixed signal.
Based on the broadband frequency band difference of the G.fast signal, the VDSL2 signal and the voice signal, the three signals are coupled twice successively, so that the signals are ensured to be free from overlapping frequency bands and are not mutually influenced. Therefore, the problem that the G.fast technology directly accesses the existing VDSL2 broadband network to cause mutual interference is solved, and the requirement of VDSL2 users for increasing the broadband access rate of copper wires is met.
In the step a, the two adjacent signals include a VDSL2 signal and a voice signal;
the high-pass filtering and the low-pass filtering are performed by the upper frequency limit f of the voice signal broadband frequency band 1 Hz is a node that filters out the VDSL2 signal and the voice signal, respectively;
in step B, the high-pass filtering and the low-pass filtering are performed with a lower frequency limit f of the broadband frequency band of the G.fast signal 2 Hz to the upper frequency limit f of the VDSL2 signal broadband frequency band 3 Any frequency in the range of Hz is taken as a node, and f is filtered by high-pass filtering 2 The G.fast signal from Hz to the node frequency band is reserved from the node to f 4 A G.fast signal in the Hz frequency band;
low-pass filtering to remove the mixed signal above the node frequency band, and reserving the mixed signal below the node;
wherein f 1 Hz＜f 2 Hz＜f 3 Hz＜f 4 Hz。
From the above, the lower frequency limit f of the G.fast signal broadband frequency band 2 Hz to the upper frequency limit f of the VDSL2 signal broadband frequency band 3 Any frequency in the range of Hz is a node, and the g.fast signal above that node is coupled or decoupled. Because the distance required by the g.fast technology is only about one kilometer, the transmission can be performed by using a higher frequency band in the copper wire. Based on this, even if the low frequency portion where the g.fast signal overlaps with the VDSL2 signal is filtered out, the transmission speed of the g.fast signal is not affected. The problem of mutual interference caused by direct access of the G.fast technology to the existing VDSL2 signal copper wire is solved, and the requirement of a VDSL2 user for increasing the broadband access rate of the copper wire is met.
Wherein in step B, the high pass filtering and the low pass filtering are performed with an upper frequency limit f of the VDSL2 signal broadband band 3 Hz is a node, and the high-pass filtering is lower than f 3 G.fast signal of Hz frequency band, reserve f 3 Hz to f 4 GFast in the Hz bandA signal;
the low pass filter remains below f 3 Said mixed signal in the Hz frequency band.
From above, at f 3 The Hz is a node, and the low-frequency part of the G.fast signal is filtered under the condition of keeping all frequency bands of the VDSL2 signal, so that on one hand, the requirement of a user using the VDSL2 signal is ensured, and the existing resources of the VDSL2 user are fully utilized; on the other hand, the low-frequency part of the G.fast signal is filtered out, so that the transmission of the G.fast signal is not basically negatively influenced, and two purposes are achieved.
In the step a, the two adjacent signals include a g.fast signal and a VDSL2 signal;
the high-pass filtering and the low-pass filtering are carried out by the lower frequency limit f of the broadband frequency band of the G.fast signal 2 Hz to the upper frequency limit f of the VDSL2 signal broadband frequency band 3 Any frequency in the range of Hz is taken as a node, and f is filtered by high-pass filtering 2 The G.fast signal from Hz to the node frequency band is reserved from the node to f 4 A G.fast signal in the Hz frequency band;
low pass filtering filters out the node to f 3 VDSL2 signal of Hz frequency band is reserved 1 Hz to the VDSL2 signal of the node;
in step B, the high-pass filtering and the low-pass filtering are performed with an upper frequency limit f of the wideband frequency band of the voice signal 1 Hz is a node, and the mixed signal and the voice signal are filtered out respectively;
wherein f 1 Hz＜f 2 Hz＜f 3 Hz＜f 4 Hz。
From the above, the lower frequency limit f of the G.fast signal broadband frequency band 2 Hz to the upper frequency limit f of the VDSL2 signal broadband frequency band 3 Any frequency in the range of Hz is a node, and the g.fast signal above that node is coupled or decoupled. Because the distance required by the g.fast technology is only about one kilometer, the transmission can be performed by using a higher frequency band in the copper wire. Based on this, even if the low frequency portion where the g.fast signal overlaps with the VDSL2 signal is filtered out, the transmission speed of the g.fast signal is not affected. Solves the problem that the G.fast technology is directly connected into the existing VDSL2 signal copper wire to cause the two to be caused by frequency bandsThe problem of mutual interference caused by overlapping is that the voice signal, the VDSL2 signal and the filtered G.fast signal are not overlapped in frequency bands, so that frequency division multiplexing can be realized, and the requirement of VDSL2 users for increasing the broadband access rate of copper wires is met.
In step A, the high-pass filtering and the low-pass filtering are performed with the upper frequency limit f of the VDSL2 signal broadband frequency band 3 Hz is used as node, and f is filtered by high-pass filtering 2 Hz to f 3 G.fast signal of Hz frequency band, reserve f 3 Hz to f 4 A G.fast signal in the Hz frequency band;
low pass filtering to preserve f 1 Hz to f 3 VDSL2 signals in the Hz band.
From above, at f 3 Hz is a node, so that the voice signal, the VDSL2 signal and the filtered G.fast signal are not overlapped in the frequency band, the frequency division multiplexing can be realized, and the requirement of VDSL2 users on increasing the broadband access rate of copper wires is met.
In addition, the application correspondingly provides a multiplexing transmission device of the G.fast signal, the VDSL2 signal and the voice signal in the copper wire, which comprises the following components:
a first splitter, configured to couple two signals adjacent to a frequency band in the selected g.fast signal, VDSL2 signal, and voice signal once, so as to form a first mixed signal and an unselected single signal;
the primary coupling comprises the steps of carrying out high-pass filtering on a signal of a high frequency band in the two signals forming a first mixed signal, carrying out low-pass filtering on the other signal, and then multiplexing the signal to the frequency band occupied by the first mixed signal;
the second separator is connected with the first separator and is used for carrying out secondary coupling on the two signals, namely the mixed signal and the single signal, so as to form a second mixed signal to be transmitted in a copper wire;
The secondary coupling includes high-pass filtering a signal of a high frequency band of the two signals forming the second mixed signal, low-pass filtering the other signal, and multiplexing the other signal to the frequency band occupied by the second mixed signal.
From the above, the voice signal, the VDSL2 signal and the filtered g.fast signal do not overlap in frequency band, and frequency division multiplexing can be realized. The problem of mutual interference caused by direct access of the G.fast technology to the existing VDSL2 signal copper wire is solved, and the requirement of a VDSL2 user for increasing the broadband access rate of the copper wire is met.
Wherein,,
the first separator comprises a high-pass filter and a low-pass filter;
one end of a high-pass filter of the first separator is connected with equipment for transmitting VDSL2 signals, and one end of a low-pass filter of the first separator is connected with equipment for transmitting voice signals; the other end of the high-pass filter and the other end of the low-pass filter of the first separator are respectively connected with a mixed signal port;
the second separator comprises a high-pass filter and a low-pass filter;
one end of a high-pass filter of the second separator is connected with equipment for transmitting the G.fast signal, and the other end of the high-pass filter of the second separator is connected with a copper wire;
one end of the low-pass filter of the second separator is connected with the mixed signal port, and the other end of the low-pass filter of the second separator is connected with the copper wire.
Based on the broadband frequency band difference of the G.fast signal, the VDSL2 signal and the voice signal, the three signals are coupled twice successively by utilizing the bidirectional conduction characteristics of the high-pass filter and the low-pass filter in the separator, so that the signals are relatively clean and are not affected mutually. Therefore, the problem that the G.fast technology directly accesses the existing VDSL2 signal copper wire to cause mutual interference is solved, and the requirement of VDSL2 users for increasing the broadband access rate of the copper wire is met.
Wherein,,
the first separator comprises a high-pass filter and a low-pass filter;
one end of a high-pass filter of the first separator is connected with equipment for transmitting the G.fast signal, and one end of a low-pass filter of the first separator is connected with equipment for transmitting the VDSL2 signal;
the other end of the high-pass filter and the other end of the low-pass filter of the first separator are respectively connected with a mixed signal port;
the second separator comprises a high-pass filter and a low-pass filter;
one end of a high-pass filter of the second separator is connected with the mixed signal port, and the other end of the high-pass filter of the second separator is connected with the copper wire;
one end of the low-pass filter of the second separator is connected with equipment for transmitting voice signals, and the other end of the low-pass filter of the second separator is connected with the copper wire.
Based on the broadband frequency band difference of the G.fast signal, the VDSL2 signal and the voice signal, the three signals are coupled twice successively by utilizing the bidirectional conduction characteristics of the high-pass filter and the low-pass filter in the separator, so that the signals are ensured to have no overlapping frequency bands and are not affected mutually. Therefore, the problem that the G.fast technology directly accesses the existing VDSL2 signal copper wire to cause mutual interference is solved, and the requirement of VDSL2 users for increasing the broadband access rate of the copper wire is met.
Drawings
Fig. 1 is a flow chart of a method of frequency division multiplexing transmission of g.fast, VDSL2 and voice signals in a copper wire;
fig. 2 is a schematic diagram of a first embodiment of a frequency division multiplexing transmission device of g.fast, VDSL2 and voice signals in a copper wire;
fig. 3 is a schematic diagram of a second embodiment of a frequency division multiplexing transmission device of g.fast, VDSL2 and voice signals in copper wires;
FIG. 4 is a schematic diagram of the broadband frequency bands of the frequency division multiplexed transmission of G.fast, VDSL2 and voice signals in copper wires;
FIG. 5 is a schematic diagram of the broadband frequency bands of VDSL2 and voice signals in copper wire in the prior art
Fig. 6 is a schematic diagram of the broadband frequency bands of g.fast and voice signals in copper wire in the prior art.
Detailed Description
The method and apparatus for multiplexing g.fast signal, VDSL2 signal and voice signal in copper wire according to the present invention will be described in detail with reference to fig. 1 to 4.
As shown in fig. 1, the frequency division multiplexing transmission method of the g.fast signal, the VDSL2 signal and the voice signal in the copper wire includes the steps of:
s100: the g.fast signal, the VDSL2 signal and the voice signal are coupled at the local side once to form a set of mixed signals and a set of individual signals.
The local side refers to a party providing terminal access and generally comprises a switch or a data node machine. As shown in fig. 2, the central transmission unit at the office end is used for transmitting VDSL2 signals and g.fast signals, corresponding to the ATU-C/VDSL2 and ATU-C/g.fast shown in fig. 2, respectively, as a modem of the telephone exchange which is a component of the asymmetric digital subscriber line. The telephone exchange equipment at the local side transmits voice signals.
Based on the background technology, the broadband frequency band of the voice signal is 0 Hz-f 1 The broadband frequency band of the VDSL2 signal is f 1 Hz～f 3 The broadband frequency band of the Hz, G.fast signal is f 2 Hz～f 4 Hz，f 1 ＜f 2 ＜f 3 ＜f 4 Wherein f 1 4KH, f 2 1MHz, f 3 Is 17MHz, f 4 Is 216MHz.
The method comprises the steps of setting a local side first separator, wherein the local side first separator comprises a high-pass filter and a low-pass filter. Two ends of the high-pass filter are respectively connected with an ATU-C/VDSL2 and a low-pass filter port in a local side second separator; and two ends of the low-pass filter are respectively connected with the telephone switching equipment and a low-pass filter port in the local side second separator. The ports of the high-pass filter and the low-pass filter in the first splitter at the local side, which are connected with the second splitter, are called mixed signal ports.
Referring to FIG. 5, two filters of the first splitter at the local side use the upper frequency limit f of the wideband band of the voice signal 1 Hz is a node, and high-pass and low-pass filtering is performed, respectively, to filter out the voice signal and VDSL2 signal, respectively. The first splitter at the local side couples the voice signal and the VDSL2 signal to form a set of mixed signals.
S200: and performing secondary coupling on the mixed signal and the single signal at the local side to form a mixed signal of G.fast, VDSL2 and voice signals, and transmitting the mixed signal to a network copper wire.
The method comprises the steps of setting a local side second separator, wherein the local side second separator also comprises a high-pass filter and a low-pass filter. The two ends of the high-pass filter are respectively connected with an ATU-C/G.fast and a network copper wire, wherein the network copper wire is a telephone line and is used for connecting a local side and a user side; and two ends of the low-pass filter are respectively connected with the mixed signal port of the local side first separator and the network copper wire.
As shown in fig. 5 and 6, the two filters of the second splitter at the local side uses the upper frequency limit f of the broadband frequency band of the VDSL2 signal 3 Hz is node, and the high-pass and low-pass filtering is carried out to the G.fast signal transmitted by ATU-C/G.fast and the mixed signal of the voice signal and VDSL2 signal transmitted by the first separator at the local side in step S100, so as to filter the G.fast signal and the mixed signal. The local side second splitter couples the mixed signal and the g.fast signal transmitted by the ATU-C/g.fast in the network copper wire to form a mixed signal of the g.fast signal, the VDSL2 signal and the voice as shown in fig. 4, and transmits the mixed signal to the subscriber side through the network copper wire.
In this embodiment, the upper frequency limit f of the broadband frequency band of the VDSL2 signal is used 3 Hz is taken as a node, and the practical use is not limited to the node, and the lower frequency limit f of the broadband frequency band of the G.fast signal is used as shown in the combination of fig. 5 and 6 2 Hz to the upper frequency limit f of the VDSL2 signal broadband frequency band 3 And (3) taking any frequency in the range of the Hz as a node, and respectively carrying out high-pass and low-pass filtering on the G.fast signal transmitted by the ATU-C/G.fast and the mixed signal of the voice signal transmitted by the first separator at the local side and the VDSL2 signal in the step S100, thereby respectively filtering out the G.fast signal and the mixed signal. I.e. high pass filtering to remove f 2 The G.fast signal from Hz to the node frequency band is reserved from the node to f 4 A G.fast signal in the Hz frequency band; the mixed signal higher than the node frequency band is filtered by low-pass filtering, and the mixed signal lower than the node is reserved.
S300: at the user side, the mixed signal of the g.fast signal, the VDSL2 signal and the voice is separated once into a set of individual signals and a set of mixed signals.
The user terminal corresponds to the local terminal. The second separator at the user end is arranged, and the inside of the second separator comprises a high-pass filter and a low-pass filter. The two ends of the high-pass filter are respectively connected with the network copper wire and the user end G.fast modem, and the ATU-R/G.fast is shown in a corresponding figure 2; and two ends of the low-pass filter are respectively connected with the network copper wire and a mixed signal port in a first separator at the user side.
Two filters in the second splitter of the user terminal use the upper limit f of the VDSL2 signal broadband frequency band 3 Hz is a node that performs high-pass and low-pass filtering on a mixed signal of a g.fast signal, a VDSL2 signal, and a voice signal, separating out an individual g.fast signal, and a mixed signal including the VDSL2 signal and the voice signal.
S400: at the user end, the mixed signal in step S300 is subjected to secondary separation, and two groups of individual signals are separated.
The method comprises the steps of setting a first separator at a user side, wherein the first separator at the user side also comprises a high-pass filter and a low-pass filter. The two ends of the high-pass filter are respectively connected with a low-pass filter port of a second separator at the user side and the VDSL2 modem at the user side, and the ATU-R/VDSL2 is shown in a corresponding figure 2; and two ends of the low-pass filter are respectively connected with a low-pass filter port of the second separator at the user end and the telephone. The connection ends of the high-pass filter, the low-pass filter and the second separator in the first separator of the user end are called as the mixed signal port of the first separator.
The two filters are used for limiting the upper limit f of the broadband frequency band of the voice signal 1 Hz is a node, and the mixed signal of the VDSL2 signal and the voice signal is subjected to high-pass and low-pass filtering. Thereby separating VDSL2 signals and voice signals.
The above steps are described by taking the output from the local side and the reception from the user side as an example. Since the filters in the local side splitter and the subscriber side splitter are bi-directionally conductive in the passband frequency range, signals can be transmitted from either side to the other. Naturally, it is understood that embodiments are also included in which the output is output by the user side and received by the office side. That is, the second splitter at the subscriber end couples the VDSL2 signal and the voice signal to form a mixed signal, and the first splitter at the subscriber end couples the g.fast signal and the mixed signal to form a mixed signal of the g.fast signal, the VDSL2 signal and the voice signal. At the local side, the local side second separator separates the mixed signal formed by the G.fast signal, the VDSL2 signal and the voice signal into the G.fast signal and the mixed signal formed by the VDSL2 signal and the voice signal, and the local side first separator separates the mixed signal formed by the VDSL2 signal and the voice signal into the VDSL2 signal and the voice signal.
The first splitter at the local side and the first splitter at the user side are implemented by using the upper limit f of the broadband frequency band of VDSL2 3 Hz is node, filter out less than f 3 A g.fast signal in the Hz band. Since the distance required for transmission by the g.fast technology is only about one kilometer (the distance is short), transmission can be performed using a higher frequency band in the copper wire. Based on this, even if the low frequency part of the g.fast signal overlapping with the VDSL2 signal is filtered out (the broadband frequency band of the g.fast signal is correspondingly filtered out to be f 2 Hz～f 3 Hz) does not affect the transmission speed of the g.fast signal.
Through the technical scheme, the voice signal, the VDSL2 signal and the G.fast signal can be transmitted in the copper wire network at the same time without mutual interference, so that the three-frequency-band frequency division multiplexing shown in figure 4 is formed, the problem of mutual interference caused by the direct access of the G.fast technology to the copper wire of the existing VDSL2 signal is solved, and the requirement of a VDSL2 user for increasing the broadband access rate of the copper wire is met.
In addition, the present invention also provides a second embodiment of a method for frequency division multiplexing transmission of g.fast signals, VDSL2 signals and voice signals in copper wires, as shown in fig. 3, comprising the following steps:
s100: the g.fast signal, the VDSL2 signal and the voice signal are coupled at the local side once to form a set of mixed signals and a set of individual signals.
The method comprises the steps of setting a local side first separator, wherein the local side first separator comprises a high-pass filter and a low-pass filter. Two ends of the high-pass filter are respectively connected with a local side ATU-C/G.fast and a high-pass filter port in a local side second separator; and two ends of the low-pass filter are respectively connected with the local ATU-C/VDSL2 and the high-pass filter port in the local second separator. The connection ends of the high-pass filter and the low-pass filter in the first splitter at the local side and the second splitter at the local side described below are called a mixed signal port.
Referring to fig. 5 and 6, the two filters of the first splitter at the local side use the upper frequency limit f of the VDSL2 broadband band 3 Hz is a node, and high-pass filtering and low-pass filtering are performed respectively, so as to filter out a VDSL2 signal and a g.fast signal respectively. The first splitter at the local side couples the VDSL2 signal transmitted by the ATU-C/VDSL2 and the G.fast signal transmitted by the ATU-C/G.fast to form a group of mixed signals.
In this embodiment, the upper frequency limit f of the broadband frequency band of the VDSL2 signal is used 3 Hz is taken as a node, and the practical use is not limited to the node, and the lower frequency limit f of the broadband frequency band of the G.fast signal is used as shown in the combination of fig. 5 and 6 2 Hz to the upper frequency limit f of the VDSL2 signal broadband frequency band 3 Any frequency in the range of the Hz is a node, and the high-pass filtering and the low-pass filtering are respectively carried out on the G.fast signal transmitted by the ATU-C/G.fast and the VDSL2 signal transmitted by the ATU-C/VDSL2, so that the G.fast signal and the VDSL2 signal are respectively filtered. I.e. high pass filtering to remove f 2 The G.fast signal from Hz to the node frequency band is reserved from the node to f 4 A G.fast signal in the Hz frequency band; low pass filtering filters out the node to f 3 VDSL2 signal of Hz frequency band is reserved 1 Hz to the VDSL2 signal of that node.
S200: and performing secondary coupling on the mixed signal and the single signal at the local side to form a mixed signal of G.fast, VDSL2 and voice, and transmitting the mixed signal to a copper wire.
The method comprises the steps of setting a local side second separator, wherein the local side second separator also comprises a high-pass filter and a low-pass filter. The two ends of the high-pass filter are respectively connected with the mixed signal port of the first separator of the local side and a network copper wire, wherein the network copper wire is a telephone wire and is used for connecting the local side and the user side; and two ends of the low-pass filter are respectively connected with the telephone switching equipment and the network copper wire.
As shown in fig. 5 and 6, the two filters of the second splitter at the local side use the upper frequency limit f of the wideband band of the voice signal 1 Hz is node, and the voice signal transmitted by telephone exchange equipment, and the G.fast signal and VDSL2 signal transmitted by the first splitter at the local side in step S100The mixed signal is subjected to high-pass and low-pass filtering, respectively, so that the voice signal and the mixed signal are filtered out, respectively. The office side second splitter couples the voice signal and the mixed signal in the network copper wire to form a mixed signal of the g.fast signal, the VDSL2 signal and the voice as shown in fig. 4, and transmits the mixed signal to the user side through the network copper wire.
S300: at the user side, the mixed signals of g.fast, VDSL2 and voice are separated once into a set of individual signals and a set of mixed signals.
The second separator at the user end is arranged, and the inside of the second separator comprises a high-pass filter and a low-pass filter. Two ends of the high-pass filter are respectively connected with the network copper wire and the mixed signal port of the first separator at the user end; and two ends of the low-pass filter are respectively connected with the network copper wire and the telephone.
The two filters in the second separator at the user end use the upper frequency limit f of the wideband frequency band of the voice signal 1 Hz is a node that high-pass, low-pass filters a mixed signal of a g.fast signal, a VDSL2 signal, and a voice signal, separates into individual voice signals, and a mixed signal including the g.fast signal and the VDSL2 signal.
S400: at the user end, the mixed signal in step S300 is separated into two sets of individual signals.
The method comprises the steps of setting a first separator at a user side, wherein the first separator at the user side also comprises a high-pass filter and a low-pass filter. The two ends of the high-pass filter are respectively connected with a high-pass filter port of the user side second separator and the user side G.fast modem ATU-R/G.fast; and two ends of the low-pass filter are respectively connected with a high-pass filter port of the user side second separator and a user side VDSL2 modem ATU-R/VDSL2. The end of the high pass filter and the low pass filter of the first splitter at the user side, which is connected with the second splitter at the user side, is called as a mixed signal port of the first splitter at the user side.
The two filters use the upper frequency limit f of the VDSL2 signal broadband frequency band 3 Hz is a node, and the mixed signal of the VDSL2 signal and the g.fast signal is subjected to high-pass and low-pass filtering. Thereby making itThe VDSL2 signal and the g.fast signal are separated.
The second embodiment is also described taking the output from the local side and the reception from the user side as an example, similarly to the first embodiment. It is to be understood that the method further includes the case of outputting by the user terminal and receiving by the office terminal, and will not be described herein. The technical problems solved by this embodiment are the same as those solved by the first embodiment, and the low frequency end region of the g.fast signal and the high frequency region of the VDSL2 are filtered to remove the overlapping portion, so that the voice signal, the VDSL2 signal and the g.fast signal can be transmitted in the copper wire network at the same time without mutual interference.
Correspondingly, the invention also provides a frequency division multiplexing transmission device of the G.fast, the VDSL2 and the voice signals in the copper wires, which comprises a local side and a user side which are connected through the network copper wires.
Fig. 2 is a schematic diagram of a first embodiment of the frequency division multiplexing transmission device, where the local side includes:
the central transmission unit, shown in fig. 2 as ATU-C/VDSL2 and ATU-C/g.fast, is used for transmitting VDSL2 signals and g.fast signals, respectively.
Telephone switching apparatus for transmitting voice signals.
The frequency division multiplexing transmission device comprises a local side first separator and a local side second separator.
The first splitter at the local side comprises a high-pass filter and a low-pass filter.
Two ends of the high-pass filter in the first separator at the local side are respectively connected with the ATU-C/VDSL2 and the low-pass filter port in the second separator at the local side, so as to use the upper frequency limit f of the broadband frequency band of the voice signal 1 Hz is node, filter out more than f 1 A VDSL2 signal of Hz;
the two ends of the low-pass filter in the first separator of the local side are respectively connected with the telephone switching equipment and the ports of the low-pass filter in the second separator of the local side, so as to use the upper frequency limit f of the wideband frequency band of the voice signal 1 Hz is node, filter out less than f 1 A Hz voice signal.
And one end, connected with the low-pass filter in the local side second separator, of the high-pass filter and the low-pass filter in the local side first separator is a mixed signal port, so that the filtered VDSL2 signal and the filtered voice signal are coupled to form a mixed signal of the VDSL2 signal and the voice signal.
The local side second separator comprises a high-pass filter and a low-pass filter.
Two ends of the high-pass filter in the local side second separator are respectively connected with a G.fast port of the central transmission unit and a network copper wire, and the upper frequency limit f of the VDSL2 signal broadband frequency band is used 3 Hz is node, filter out more than f 3 A g.fast signal at Hz;
the network copper wire is a telephone line and is used for connecting a local side and a user side;
two ends of a low-pass filter in the local side second separator are respectively connected with a mixed signal port of the local side first separator and the network copper wire, and the upper frequency limit f of a VDSL2 signal broadband frequency band is used 3 Hz is node, filter out less than f 3 A mixed signal of a VDSL2 signal and a voice signal of Hz.
The high-pass filter in the local side second separator is connected with the connection end of the network copper wire and the low-pass filter is connected with the connection end of the network copper wire, so that the mixed signal of the filtered VDSL2 signal and the voice signal and the G.fast signal are coupled, and the mixed signal of the G.fast signal, the VDSL2 signal and the voice signal is formed.
In this embodiment, the local side second splitter uses the upper frequency limit f of the broadband frequency band of the VDSL2 signal 3 Hz is taken as a node, and the practical use is not limited to the node, and the lower frequency limit f of the broadband frequency band of the G.fast signal is used as shown in the combination of fig. 5 and 6 2 Hz to the upper frequency limit f of the VDSL2 signal broadband frequency band 3 And (3) taking any frequency in the range of the Hz as a node, and respectively carrying out high-pass and low-pass filtering on the G.fast signal transmitted by the ATU-C/G.fast and the mixed signal of the voice signal transmitted by the first separator at the local side and the VDSL2 signal in the step S100, thereby respectively filtering out the G.fast signal and the mixed signal. I.e. high pass filtering to remove f 2 The G.fast signal from Hz to the node frequency band is reserved from the node to f 4 A G.fast signal in the Hz frequency band; low and lowAnd filtering the mixed signal higher than the node frequency band by filtering, and reserving the mixed signal lower than the node.
The frequency division multiplexing transmission device also comprises a second separator at the user end and a first separator at the user end.
The second separator at the user end comprises a high-pass filter and a low-pass filter.
The two ends of the high-pass filter in the second separator are respectively connected with the network copper wire and the G.fast modem of the user side, which is shown as ATU-R/G.fast in figure 2, and the upper frequency limit f of the broadband frequency band of the VDSL2 signal is used 3 Hz is node, filter out more than f 3 The Hz G.fast signal is transmitted to the ATU-R/G.fast;
the two ends of the low-pass filter in the second separator at the user end are respectively connected with the mixed signal ports of the network copper wire and the first separator at the user end, and the upper frequency limit f of the broadband frequency band of the VDSL2 signal is used 3 Hz is node, filter out less than f 3 The G.fast signal of the Hz is transmitted to a mixed signal port of the first separator of the user side;
the first separator at the user end comprises a high-pass filter and a low-pass filter.
The two ends of the high-pass filter in the first separator of the user terminal are respectively connected with the low-pass filter port in the second separator of the user terminal and the VDSL2 modem of the user terminal, and the ATU-R/VDSL2 is shown in figure 2, and the upper frequency limit f of the broadband frequency band of the voice signal is used 1 Hz is node, filter out more than f 1 The VDSL2 signal of Hz is transmitted to the ATU-R/VDSL2;
two ends of the low-pass filter in the first separator of the user terminal are respectively connected with the low-pass filter port in the second separator of the user terminal and the telephone set, so that the upper frequency limit f of the wideband frequency band of the voice signal is used 1 Hz is node, filter out less than f 1 The Hz voice signal is transmitted to the telephone.
In the above embodiment, the local side second splitter and the user side second splitter have the same structure; the local side first separator and the user side first separator have the same structure. The two separators at the user end can also realize the coupling of signals, and the two separators at the local end can also realize the separation of signals.
Fig. 3 is a schematic diagram of a second embodiment of the frequency division multiplexing transmission device, where the local side includes:
the central transmission unit, shown in fig. 3 as ATU-C/VDSL2 and ATU-C/g.fast, is used for transmitting VDSL2 signals and g.fast signals, respectively.
Telephone switching apparatus for transmitting voice signals.
The frequency division multiplexing transmission device comprises a local side first separator and a local side second separator.
The first splitter at the local side comprises a high-pass filter and a low-pass filter.
Two ends of the high-pass filter in the first separator at the local side are respectively connected with an ATU-C/G.fast and a high-pass filter port in the second separator at the local side, and the upper frequency limit f of the broadband frequency band of the VDSL2 signal is used 3 Hz is node, filter out more than f 3 A g.fast signal at Hz;
the two ends of the low-pass filter in the first separator at the local side are respectively connected with the ATU-C/VDSL2 and the high-pass filter port in the second separator at the local side, and the upper frequency limit f of the broadband frequency band of the VDSL2 signal is used 3 Hz is node, filter out less than f 3 VDSL2 signal of Hz.
The connection ends of the high-pass filter and the low-pass filter in the first local separator and the high-pass filter in the second local separator are called a mixed signal port, so that the filtered G.fast signal and the VDSL2 signal are coupled, and a signal mixed signal of the G.fast signal and the VDSL2 signal is formed.
In this embodiment, the first splitter at the local side uses the upper frequency limit f of the broadband frequency band of the VDSL2 signal 3 Hz is taken as a node, and the practical use is not limited to the node, and the lower frequency limit f of the broadband frequency band of the G.fast signal is used as shown in the combination of fig. 5 and 6 2 Hz to the upper frequency limit f of the VDSL2 signal broadband frequency band 3 Any frequency in the range of Hz is a node, and the high-pass is carried out on the G.fast signal transmitted by the ATU-C/G.fast and the VDSL2 signal transmitted by the ATU-C/VDSL2, Low pass filtering to filter out the g.fast signal and VDSL2 signal, respectively. I.e. high pass filtering to remove f 2 The G.fast signal from Hz to the node frequency band is reserved from the node to f 4 A G.fast signal in the Hz frequency band; low pass filtering filters out the node to f 3 VDSL2 signal of Hz frequency band is reserved 1 Hz to the VDSL2 signal of that node.
The local side second separator comprises a high-pass filter and a low-pass filter.
Two ends of the high-pass filter in the local side second separator are respectively connected with the mixed signal port of the local side first separator and the network copper wire, so that the upper frequency limit f of the voice signal broadband frequency band is used 1 Hz is node, filter out more than f 1 A mixed signal of a g.fast signal and a VDSL2 signal of Hz; the network copper wire is a telephone line and is used for connecting a local side and a user side;
two ends of a low-pass filter in the local side second separator are respectively connected with the telephone switching equipment and the network copper wire, so as to use the upper frequency limit f of the voice signal broadband frequency band 1 Hz is node, filter out less than f 1 A Hz voice signal.
The high-pass filter in the local side second separator is connected with the connecting end of the network copper wire and the low-pass filter is connected with the connecting end of the network copper wire, so that the filtered voice signal is coupled with the mixed signal of the G.fast signal and the VDSL2 signal, and the mixed signal of the G.fast signal, the VDSL2 signal and the voice signal is formed.
The frequency division multiplexing transmission device also comprises a second separator at the user end and a first separator at the user end.
The second splitter at the user end comprises a high-pass filter and a low-pass filter.
The two ends of the high-pass filter in the second separator at the user end are respectively connected with the mixed signal ports of the network copper wire and the first separator at the user end, so that the upper frequency limit f of the broadband frequency band of the voice signal is used 1 Hz is node, filter out more than f 1 The mixed signal of the Hz G.fast signal and the VDSL2 is transmitted to a mixed signal port of a first separator at the user side;
two ends of a low-pass filter in a second separator of the user side are respectively connected with a mixed signal port of the first separator of the user side and a telephone set, and the upper frequency limit f of a broadband frequency band of a voice signal is used 1 Hz is node, filter out less than f 1 A Hz voice signal is transmitted to the telephone;
the first separator at the user end comprises a high-pass filter and a low-pass filter.
The two ends of the high-pass filter in the first splitter of the user terminal are respectively connected with the high-pass filter port of the second splitter of the user terminal and the G.fast modem of the user terminal, and the ATU-R/G.fast is shown in fig. 3, and the upper frequency limit f of the broadband frequency band of the VDSL2 signal is used 3 Hz is node, filter out more than f 3 The Hz G.fast signal is transmitted to the G.fast port of the ATU-R/G.fast user terminal modem;
two ends of a low-pass filter in a first separator of a user terminal are respectively connected with a high-pass filter port of a second separator of the user terminal and the VDSL2 modem of the user terminal, and shown in FIG. 3 as ATU-R/VDSL2, and the upper frequency limit f of a broadband frequency band of a VDSL2 signal is used 3 Hz is node, filter out less than f 3 The VDSL2 signal of Hz is transmitted to the VDSL2 port of the subscriber side modem.
The high-pass filter and the low-pass filter in the first separator of the user side are connected with the second separator of the user side, and one end of the high-pass filter and the low-pass filter, which is connected with the second separator of the user side, is called a mixed signal port of the first separator of the user side.
Similarly, in the above embodiment, the local side second splitter and the user side second splitter have the same structure; the local side first separator and the user side first separator have the same structure. The two separators at the user end can also realize the coupling of signals, and the two separators at the local end can also realize the separation of signals.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (8)
1. A frequency division multiplexing transmission method of G.fast signal, VDSL2 signal and voice signal in copper wire is characterized by comprising the following steps
A. Selecting two signals with adjacent frequency bands in the G.fast signal, the VDSL2 signal and the voice signal to perform primary coupling to form a first mixed signal and an unselected single signal;
in the primary coupling, high-pass filtering is carried out on a signal of a high frequency band in the two signals forming the first mixed signal, low-pass filtering is carried out on the other signal, and then the signal is multiplexed to the frequency band occupied by the first mixed signal;
B. performing secondary coupling on the two signals of the mixed signal and the single signal to form a second mixed signal for transmission in a copper wire;
in the secondary coupling, high-pass filtering is carried out on a signal of a high frequency band in the two signals forming a second mixed signal, low-pass filtering is carried out on the other signal, and then the signal is multiplexed to the frequency band occupied by the second mixed signal;
wherein:
in the step A, the two adjacent signals comprise a VDSL2 signal and a voice signal; the high-pass filtering and the low-pass filtering are performed by the upper frequency limit f of the voice signal broadband frequency band 1 Hz is a node that filters out the VDSL2 signal and the voice signal, respectively;
In step B, the high-pass filtering and the low-pass filtering are performed with a lower frequency limit f of the broadband frequency band of the G.fast signal 2 Hz to the upper frequency limit f of the VDSL2 signal broadband frequency band 3 Any frequency in the range of Hz is taken as a node, and f is filtered by high-pass filtering 2 The G.fast signal from Hz to the node frequency band is reserved from the node to f 4 A G.fast signal in the Hz frequency band; filtering the mixed signal higher than the node frequency band by low-pass filtering, and reserving the mixed signal lower than the node; wherein f 1 Hz＜f 2 Hz＜f 3 Hz＜f 4 Hz; or alternatively
In the step a, the two adjacent signals include a g.fast signal and a VDSL2 signal; the high pass filtering and the low pass filtering are performed with the G.fast signal widebandLower frequency limit f of frequency band 2 Hz to the upper frequency limit f of the VDSL2 signal broadband frequency band 3 Any frequency in the range of Hz is taken as a node, and f is filtered by high-pass filtering 2 The G.fast signal from Hz to the node frequency band is reserved from the node to f 4 A G.fast signal in the Hz frequency band; low pass filtering filters out the node to f 3 VDSL2 signal of Hz frequency band is reserved 1 Hz to the VDSL2 signal of the node;
in the step B, the high-pass filtering and the low-pass filtering are performed by the upper frequency limit f of the wideband frequency band of the voice signal 1 Hz is a node, and the mixed signal and the voice signal are filtered out respectively; wherein f 1 Hz＜f 2 Hz＜f 3 Hz＜f 4 Hz。
2. The method according to claim 1, wherein in the step B, the high-pass filtering and the low-pass filtering are performed with a lower frequency limit f of a wideband frequency band of the g.fast signal 2 Hz to the upper frequency limit f of the VDSL2 signal broadband frequency band 3 Any frequency in the range of Hz is a node, and the method further comprises the following steps:
in step B, the high-pass filtering and the low-pass filtering are performed with an upper frequency limit f of the VDSL2 signal broadband band 3 Hz is used as node, and f is filtered by high-pass filtering 2 Hz to f 3 G.fast signal of Hz frequency band, reserve f 3 Hz to f 4 A G.fast signal in the Hz frequency band;
the low pass filter remains below f 3 Said mixed signal in the Hz frequency band.
3. The method of claim 1, wherein the high pass filtering and the low pass filtering are at a lower frequency limit f of a wideband frequency band of the g.fast signal 2 Hz to the upper frequency limit f of the VDSL2 signal broadband frequency band 3 Any frequency in the range of Hz is a node, and the method further comprises the following steps:
in step A, the high-pass filtering and the low-pass filtering are performed with the upper frequency limit f of the VDSL2 signal broadband frequency band 3 Hz is used as node, and f is filtered by high-pass filtering 2 Hz to f 3 G.fast signal of Hz frequency band, reserve f 3 Hz to f 4 A G.fast signal in the Hz frequency band;
low pass filtering to preserve f 1 Hz to f 3 VDSL2 signals in the Hz band.
4. A frequency division multiplexing transmission device for G.fast signal, VDSL2 signal and voice signal in copper wire is characterized by comprising a first separator and a second separator which are connected with each other,
the first separator is used for coupling two signals adjacent to each other in frequency bands in the selected G.fast signal, the VDSL2 signal and the voice signal once to form a first mixed signal and an unselected single signal;
the primary coupling comprises the steps of carrying out high-pass filtering on a signal of a high frequency band in the two signals forming a first mixed signal, carrying out low-pass filtering on the other signal, and then multiplexing the signal to the frequency band occupied by the first mixed signal;
the second separator is connected with the first separator, and the two signals of the mixed signal and the single signal are coupled for the second time to form a second mixed signal to be transmitted in a copper wire;
the secondary coupling comprises the steps of carrying out high-pass filtering on a signal of a high frequency band in the two signals forming the second mixed signal, carrying out low-pass filtering on the other signal, and then multiplexing the other signal to the frequency band occupied by the second mixed signal;
wherein,,
the high-pass filter and the low-pass filter of the first separator are used for limiting the frequency f of the broadband frequency band of the voice signal 1 Hz is a node that filters out the VDSL2 signal and the voice signal, respectively;
the high-pass filter and the low-pass filter of the second separator use the lower frequency limit f of the broadband frequency band of the G.fast signal 2 Hz to the upper frequency limit f of the VDSL2 signal broadband frequency band 3 Any frequency in the range of Hz is taken as a node, and f is filtered by high-pass filtering 2 The G.fast signal from Hz to the node frequency band is reserved from the node to f 4 A G.fast signal in the Hz frequency band; filtering the mixed signal higher than the node frequency band by low-pass filtering to ensureLeaving the mixed signal below the node; wherein f 1 Hz＜f 2 Hz＜f 3 Hz＜f 4 Hz; or alternatively
The high-pass filter and the low-pass filter of the first separator use the lower frequency limit f of the G.fast signal broadband frequency band 2 Hz to the upper frequency limit f of the VDSL2 signal broadband frequency band 3 Any frequency in the range of Hz is taken as a node, and f is filtered by a high-pass filter 2 The G.fast signal from Hz to the node frequency band is reserved from the node to f 4 A G.fast signal in the Hz frequency band; the low pass filter filters out the nodes to f 3 VDSL2 signal of Hz frequency band is reserved 1 Hz to the VDSL2 signal of the node;
the high-pass filter and the low-pass filter of the second separator are used for filtering the upper frequency limit f of the broadband frequency band of the voice signal 1 Hz is a node that filters out the mixed signal and the voice signal, respectively.
5. The apparatus of claim 4, wherein the device comprises a plurality of sensors,
the first separator comprises a high-pass filter and a low-pass filter;
one end of a high-pass filter of the first separator is connected with equipment for transmitting VDSL2 signals, and one end of a low-pass filter of the first separator is connected with equipment for transmitting voice signals; the other end of the high-pass filter and the other end of the low-pass filter of the first separator are respectively connected with a mixed signal port;
the second separator comprises a high-pass filter and a low-pass filter;
one end of a high-pass filter of the second separator is connected with equipment for transmitting the G.fast signal, and the other end of the high-pass filter of the second separator is connected with a copper wire;
one end of the low-pass filter of the second separator is connected with the mixed signal port, and the other end of the low-pass filter of the second separator is connected with the copper wire.
6. The apparatus of claim 5, wherein a high pass filter and a low pass filter of the second splitter are wider than the g.fast signalLower frequency limit f of band 2 Hz to the upper frequency limit f of the VDSL2 signal broadband frequency band 3 Any frequency in the range of Hz is a node, and the method further comprises the following steps:
The high-pass filter and the low-pass filter of the second separator are used for limiting the frequency f of the broadband frequency band of the VDSL2 signal 3 Hz is a node, and the high-pass filter filters f 2 Hz to f 3 G.fast signal of Hz frequency band, reserve f 3 Hz to f 4 A G.fast signal in the Hz frequency band;
the low pass filter remains below f 3 Said mixed signal in the Hz frequency band.
7. The apparatus of claim 4, comprising a first separator and a second separator connected to each other,
the first separator comprises a high-pass filter and a low-pass filter;
one end of a high-pass filter of the first separator is connected with equipment for transmitting the G.fast signal, and one end of a low-pass filter of the first separator is connected with equipment for transmitting the VDSL2 signal;
the other end of the high-pass filter and the other end of the low-pass filter of the first separator are respectively connected with a mixed signal port;
the second separator comprises a high-pass filter and a low-pass filter;
one end of a high-pass filter of the second separator is connected with the mixed signal port, and the other end of the high-pass filter of the second separator is connected with the copper wire;
one end of the low-pass filter of the second separator is connected with equipment for transmitting voice signals, and the other end of the low-pass filter of the second separator is connected with the copper wire.
8. The apparatus of claim 7, wherein the high pass filter and the low pass filter of the first splitter are at a lower frequency limit f of the g.fast signal wideband band 2 Hz to the upper frequency limit f of the VDSL2 signal broadband frequency band 3 Any frequency in the range of Hz is a node, and the method further comprises the following steps:
the first partThe high-pass filter and the low-pass filter of the isolator are used for limiting the frequency f of the broadband frequency band of the VDSL2 signal 3 Hz is a node, and the high-pass filter filters f 2 Hz to f 3 G.fast signal of Hz frequency band, reserve f 3 Hz to f 4 A G.fast signal in the Hz frequency band;
low pass filter retention f 1 Hz to f 3 VDSL2 signals in the Hz band.
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| CN201810786144.2A CN108768571B (en) | 2018-07-17 | 2018-07-17 | Method and device for frequency division multiplexing transmission of G.fast signal, VDSL2 signal and voice signal in copper wire |
| PCT/CN2018/107991 WO2020015181A1 (en) | 2018-07-17 | 2018-09-27 | Frequency division multiplexing transmission method and device for g. fast signal, vdsl2 signal, and voice signal in copper wire |
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