TWI720709B - Method and device for adjusting cable circuit spectrum - Google Patents

Abstract

The invention provides a method and a device for adjusting cable circuit spectrum. The method includes: monitoring a plurality of cable circuits and obtaining a plurality of related circuit services; determining a lower spectrum limit of each circuit service according to a configuration of a specific circuit in the cable circuits; obtaining a highest transmission frequency supported by a cable terminal equipment, and estimate an upper spectrum limit of each circuit service; measuring a service connection rate of each circuit service, and adjusting the upper spectrum limit corresponding to each circuit service according to the service connection rate and a corresponding predetermined transmission rate of each circuit service; setting the cable terminal equipment according to the transmission spectrum lower limit and transmission spectrum upper limit corresponding to each circuit service to adjust the spectrum range corresponding to each circuit service.

Description

Method and device for adjusting frequency spectrum of cable circuit

The present invention relates to a cable circuit technology, and particularly relates to a method and device for adjusting the frequency spectrum of a cable circuit.

With the rapid growth of global broadband service demand, global telecom operators are all actively moving towards the establishment of Fiber to the Home (FTTH) to meet users' increasing demand for network bandwidth. However, in fact, from the perspective of fiber penetration rate at the user end, the construction cost of the Optical Distribution Network (ODN) network is too high, resulting in insufficient optical fiber penetration. Therefore, the use of existing copper cable lines is still the last resort. One mile access to the mainstream of the Internet.

At present, the copper broadband network has gradually developed from the fiber to the node (Fiber to the node, FTTN) and the very-high-bit-rate digital subscriber line 2 (VDSL2) architecture to the fiber to the distribution point (Fiber to the distribution point) architecture. to the distribution point, FTTdp) network architecture, by shortening the copper wire distance to increase the access network speed. The VDSL2 technology combined with the bonding technology can achieve a maximum downlink and uplink aggregation rate of 100~150Mbps. In order to connect with the Giga-level bandwidth provided by the optical fiber network, the International Telecommunication Union (International Telecommunication Union-Telecommunication, ITU-T) formulated the G.fast standard (G.9700 and G.9701) in 2014, which uses the 106MHz frequency band to provide a maximum sum rate of 1Gbps, and then increases the frequency band to 212Mz to provide a sum rate of 2Gbps. In addition, it is expected that the G.mgfast standard technology will be formulated in 2019, and the frequency band will be expanded to 424MHz and 848MHz to provide a total speed close to 10Gbps, and copper cables will continue to evolve to meet the demand for high-speed services.

At present, telecommunications companies have introduced G.fast single-port 106MHz technical equipment a few years ago to provide downstream 300M~500Mbps service capabilities. G.fast single-port is mainly used on the building floor to quickly meet the service requirements of a single customer. Next, the telecommunications industry will develop towards the G.fast multi-port technology equipment used in the telecommunications room of the building, and expand the scope of supply and installation of more high-speed services for more customers while taking into account the cost-effectiveness.

However, multi-port installation will face crosstalk interference between circuits. In order to overcome this factor, ITU-T proposes vectoring technology to solve high-frequency crosstalk interference. Under the architecture of vectorization technology, the circuit itself can not only detect the crosstalk and noise state of adjacent circuits, but also through interactive vector message communication and spectrum management, it can be pre-coded or post-coded (Post-coded). coded) to adjust the signal output to achieve the purpose of eliminating crosstalk interference. Therefore, vectorization technology is a necessary capability on G.fast devices with multiple ports.

However, due to the severe crosstalk interference of the copper cable in the high-frequency part (especially the frequency band higher than 150MHz), the signal and the interference are indistinguishable, and this also leads to the complexity and difficulty of the vectorization function at high frequency. increase. According to the current collected data and test experience, the performance gap of G.fast 212a technology between single-channel and multi-channel (such as 10-channel) vectorized crosstalk interference will be about 300Mbps, with an error of about 18%.

Therefore, for those skilled in the art, how to design a mechanism that can mitigate or reduce the impact of high-frequency crosstalk interference is indeed an important issue.

In view of this, the present invention provides a method and device for adjusting the frequency spectrum of a cable circuit, which can be used to solve the above technical problems.

The present invention provides a cable circuit spectrum adjustment method, suitable for a cable circuit spectrum adjustment device, including: monitoring a plurality of cable circuits connected between a cable equipment room end equipment and a plurality of cable user end equipment, and obtaining associations with the aforementioned cables Multiple circuit services of the circuit, wherein the cable equipment room end equipment and the aforementioned cable user end equipment are configured to apply a first electrical circuit technology, and each circuit service has a preset transmission rate and belongs to the first cable circuit technology; The configuration of a specific circuit in the cable circuit determines a lower limit of the transmission spectrum of the aforementioned circuit service, where a second cable circuit technology is applied to the specific circuit; the highest transmission frequency supported by the equipment in the cable equipment room is obtained and based on the highest transmission frequency And a rate ratio corresponding to each circuit service to estimate the upper limit of a transmission spectrum of each circuit service; measure a service connection rate of each circuit service, and based on the service connection rate of each circuit service and the corresponding preset transmission rate Adjust the corresponding upper limit of the transmission spectrum for a rate gap; set the cable equipment room end equipment according to the lower limit of the transmission spectrum and the upper limit of the transmission spectrum corresponding to each circuit service to adjust the spectrum range corresponding to each circuit service.

The invention provides a cable circuit spectrum adjustment device, which includes a spectrum resource analysis module, a connection rate monitoring module, and a spectrum parameter setting module. The spectrum resource analysis module is configured to monitor multiple cable circuits connected between a cable computer room end device and multiple cable user end devices, and obtain multiple circuit services related to the aforementioned cable circuit, among which the cable computer room end device And the aforementioned cable client equipment is configured to apply a first electrical circuit technology, and each circuit service has a predetermined transmission rate and belongs to the first cable circuit technology; the aforementioned circuit is determined according to the configuration of a specific circuit in the aforementioned cable circuit A lower limit of the transmission spectrum of the service, in which a second cable circuit technology is applied to the specific circuit; the highest transmission frequency supported by the equipment in the cable equipment room is obtained, and each circuit is estimated based on the highest transmission frequency and a rate ratio corresponding to each circuit service An upper limit of the transmission spectrum of the service. The connection rate monitoring module measures a service connection rate of each circuit service, and the spectrum resource analysis module adjusts the corresponding transmission according to a rate difference between the service connection rate of each circuit service and the corresponding preset transmission rate The upper limit of the spectrum. The spectrum parameter setting module sets the cable equipment room end equipment according to the lower limit value of the transmission spectrum and the upper limit value of the transmission spectrum corresponding to each circuit service, so as to adjust the spectrum range corresponding to each circuit service.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

Please refer to FIG. 1, which is a schematic diagram of a cable system according to an embodiment of the present invention. In this embodiment, the cable system 100 includes a cable user end device 10, a cable circuit 20, a cable machine room end device 30, a cable circuit spectrum adjustment device 40, and a service and line database 50.

In the embodiment of the present invention, the cable circuit 20 may include, for example, hundreds of pairs of bundled cables, and may be connected between the cable user end equipment 10 and the cable machine room end equipment 30, wherein the cable user end equipment 10 and the cable machine room end equipment 30 The first cable circuit technology (for example, G.fast or G.mgfast) can be applied individually, but the cable circuit 20 can support the first cable circuit technology and (optionally) the second cable circuit technology (for example VDSL2), but the present invention may not Limited to this. In order to facilitate the understanding of the concept of the present invention, G.fast and VDSL2 will be used as examples of the first and second cable circuit technologies respectively, but the present invention may not be limited thereto.

In addition, in the embodiment of the present invention, multiple circuit services belonging to the first cable circuit technology (ie, G.fast) can run on the cable circuit 20, and each circuit service can have a different preset transmission rate, and related The information can be recorded and provided by the service and route database 50.

The cable circuit spectrum adjustment device 40 may include a spectrum resource analysis module 42, a connection rate monitoring module 41 and a spectrum parameter setting module 43. In the embodiment of the present invention, the spectrum resource analysis module 42, the connection rate monitoring module 41, and the spectrum parameter setting module 43 can cooperatively execute the cable circuit spectrum adjustment method proposed by the present invention, which will be further described below.

Please refer to FIG. 2, which is a flowchart of a method for adjusting the spectrum of a cable circuit according to an embodiment of the present invention. The method in FIG. 2 can be executed by the cable circuit spectrum adjusting device 40 in FIG. 1. The details of each step in FIG. 2 are described below in conjunction with the content in FIG. 1.

First, in step S210, the spectrum resource analysis module 42 can monitor multiple cable circuits 20 connected between the cable equipment room end device 30 and the cable user end device 10, and obtain multiple circuit services associated with the cable circuit 20. In one embodiment, the aforementioned information can be obtained by the spectrum resource analysis module 42 from the service and line data 50, but it is not limited to this. In addition, as described in the previous embodiments, the cable room end equipment 30 and the cable user end equipment 10 can be configured to apply the first electrical circuit technology (ie, G.fast), and each circuit service has a preset transmission rate and belongs to The first cable circuit technology.

After that, in step S220, the spectrum resource analysis module 42 may determine the lower limit of the transmission spectrum of the foregoing circuit service according to the configuration of the specific circuit in the cable circuit 20, where the specific circuit applies the second cable circuit technology (ie, VDSL2). In short, the spectrum resource analysis module 42 can determine the lower limit of the transmission spectrum serviced by the circuit according to the configuration of the VDSL2 circuit in the cable circuit 20.

In the embodiment of the present invention, the configuration of the VDSL2 circuit in the cable circuit 20 can have at least the following three configurations: (1) No VDSL2 circuit; (2) Application of 17a specification VDSL2 circuit; (3) Application of 30a specification VDSL2 .

In an embodiment, in response to determining that there is no VDSL2 circuit in the cable circuit 20, the spectrum resource analysis module 42 may set the lower limit of the transmission spectrum serviced by the aforementioned circuit to a first value (for example, 2 MHz). In another embodiment, in response to determining that there is a VDSL2 circuit in the cable circuit 20 and that the VDSL2 circuit belongs to the 17a specification, the spectrum resource analysis module 42 may set the lower limit of the transmission spectrum serviced by the aforementioned circuit to the second value (for example, 17MHz), where the second value is higher than the first value. In another embodiment, in response to determining that there is a VDSL2 circuit in the cable circuit 20, and the VDSL2 circuit belongs to the 30a specification, the spectrum resource analysis module 42 may set the transmission rate spectrum value of the aforementioned circuit service to a third value (for example, 32MHz ), where the third value is higher than the second value.

After that, in step S230, the spectrum resource analysis module 42 can obtain the highest transmission frequency supported by the cable equipment room end device 30, and estimate the upper limit of the transmission spectrum of each circuit service based on the highest transmission frequency and the rate ratio corresponding to each circuit service .

(1) ，其中(

)為所述第N個電路服務對應的速率比例，

為所述第N個電路服務的預設傳輸速率，

為電纜機房端設備30所支援的最高傳輸頻率，

為所述第Nmax個電路服務的預設傳輸速率。 In an embodiment, the above-mentioned circuit service may include a total of Nmax from the first circuit service to the Nmax circuit service, and the preset transmission rate from the first circuit service to the Nmax circuit service is increasing . In this case, the upper limit of the transmission spectrum of the Nth circuit service in the aforementioned circuit service can be characterized as:

(1), where (

) Is the rate ratio corresponding to the Nth circuit service,

The preset transmission rate serving the Nth circuit,

Is the highest transmission frequency supported by the equipment 30 at the end of the cable machine room,

The preset transmission rate for the Nmax circuit service.

After that, in step S240, the connection rate monitoring module 41 can measure the service connection rate of each circuit service, and in step S250, the spectrum resource analysis module 42 can measure the service connection rate of each circuit service and the corresponding The rate difference between the preset transmission rates is adjusted to the corresponding upper limit of the transmission spectrum.

In an embodiment, for any one of the aforementioned circuit services (hereinafter referred to as specific circuit services), it is reflected in determining that the service connection rate of the specific circuit service is lower than the preset transmission rate of the specific circuit service, and the spectrum resource analysis model The group 42 can subtract the service connection rate of the specific circuit service from the preset transmission rate of the specific circuit service to estimate the rate difference corresponding to the specific circuit service, and estimate a correction value accordingly. After that, the spectrum resource analysis module 42 may add the corresponding correction value to the upper limit of the transmission spectrum corresponding to the specific circuit service to adjust the upper limit of the transmission spectrum corresponding to the specific circuit service.

In another embodiment, in response to determining that the service connection rate of the specific circuit service is higher than the preset transmission rate of the specific circuit service, the spectrum resource analysis module 42 may subtract the service connection rate of the specific circuit service from the service connection rate of the specific circuit service. The transmission rate is preset to estimate the rate difference corresponding to the specific circuit service, and the correction value is estimated accordingly. After that, the spectrum resource analysis module 42 may subtract the corresponding correction value from the upper limit of the transmission spectrum corresponding to the specific circuit service to adjust the upper limit of the transmission spectrum corresponding to the specific circuit service.

In an embodiment, the spectrum parameter setting module 43 may, after performing step S250, set the cable equipment room end equipment 30 according to the lower limit value of the transmission spectrum and the upper limit value of the transmission spectrum corresponding to each circuit service, so as to adjust the spectrum corresponding to each circuit service. range.

In order to make the above concepts easier to understand, an example will be supplemented below for description, but it is not used to limit the possible implementations of the present invention. Suppose a telecommunications company uses G.fast technology to provide 4 types of circuit services (that is, Nmax is 4), and its individual (downlink) preset transmission rates are, for example, 100Mbps (hereinafter referred to as Rate_1), 300Mbps (hereinafter referred to as Rate_2), 500 Mbps (hereinafter referred to as Rate_3), 1 Gbps (hereinafter referred to as Rate_4 (ie, Rate_Nmax)), there is no VDSL2 circuit in the cable circuit 20, and the highest transmission frequency supported by the cable equipment room end device 30 is 212 MHz. In the embodiment of the present invention, the information can be obtained by the spectrum resource analysis module 42 from the service and line database 50, but it is not limited to this.

Based on the teaching of the previous embodiment, since there is no VDSL2 circuit in the cable circuit 20, the lower limit of the transmission spectrum corresponding to each circuit service is, for example, 2 MHz. Moreover, for the Nmax-th circuit service, the corresponding upper limit of the transmission spectrum (represented by Service_4_Fmax) is the highest transmission frequency supported by the cable equipment room end equipment 30 (ie, Service_4_Fmax=212 MHz).

212MHz / 1000Mbps= 21.2MHz； Service_2_Fmax=300Mbps

212MHz / 1000Mbps= 63.6MHz； Service_3_Fmax=500Mbps

212MHz / 1000Mbps= 106MHz。 In addition, for the first circuit service to the third circuit service, the corresponding upper limit of the transmission spectrum (respectively represented by Service_1_Fmax, Service_2_Fmax, Service_3_Fmax) can be calculated as follows according to the formula (1) taught in the previous embodiment : Service_1_Fmax=100Mbps

212MHz / 1000Mbps= 21.2MHz; Service_2_Fmax=300Mbps

212MHz / 1000Mbps= 63.6MHz; Service_3_Fmax=500Mbps

212MHz / 1000Mbps = 106MHz.

After that, the connection rate monitoring module 41 can measure the service connection rate of each circuit service, and the spectrum resource analysis module 42 individually adjusts the upper limit of the transmission spectrum of each circuit service.

In the first embodiment, it is assumed that the service connection rate of the first circuit service is measured to be 12 Mbps. In this case, the spectrum resource analysis module 42 can determine that the service connection rate of the first circuit service is lower than the corresponding preset transmission rate (ie, 100 Mbps). Correspondingly, the spectrum parameter setting module 42 can subtract its service connection rate (ie, 12 Mbps) from the preset transmission rate (ie, 100 Mbps) of the first circuit service to estimate the rate difference corresponding to the first circuit service ( That is, 88Mbps), and estimate a correction value accordingly. In an embodiment, the above-mentioned correction value is, for example, 10% of the above-mentioned rate difference, that is, 8.8 MHz, but the present invention is not limited to this. In other embodiments, the designer can determine the estimation method of the correction value according to requirements, for example, set it as 20%, 30%, or other proportions of the above-mentioned rate difference.

After that, the spectrum resource analysis module 42 can add the upper limit of the transmission spectrum corresponding to the first circuit service (that is, 21.2MHz) to the corresponding correction value (that is, 8.8MHz) to adjust the corresponding value of the first circuit service. The upper limit of the transmission spectrum. In this embodiment, the adjusted upper limit of the transmission spectrum of the first circuit service is, for example, 30 MHz (ie, 21.2 MHz+8.8 MHz).

In the second embodiment, it is assumed that the service connection rate of the second circuit service is measured to be 336 Mbps. In this case, the spectrum resource analysis module 42 can determine that the service connection rate of the second circuit service is higher than the corresponding preset transmission rate (ie, 300 Mbps). Correspondingly, the spectrum resource analysis module 42 can subtract the preset transmission rate of the second circuit service (that is, 300 Mbps) from the service connection rate of the second circuit service (that is, 336 Mbps) to estimate that it corresponds to the second circuit. The service rate difference (ie, 36Mbps), and the correction value is estimated based on it. In one embodiment, the above-mentioned correction value is, for example, 10% of the above-mentioned rate difference, that is, 3.6 MHz, but the present invention is not limited to this. In other embodiments, the designer can determine the estimation method of the correction value according to requirements, for example, set it as 20%, 30%, or other proportions of the above-mentioned rate difference.

After that, the spectrum resource analysis module 42 can subtract the corresponding correction value (ie, 3.6MHz) from the upper limit of the transmission spectrum corresponding to the second circuit service (ie, 63.6MHz) to adjust the value corresponding to the second circuit service. The upper limit of the transmission spectrum. In this embodiment, the adjusted upper limit of the transmission spectrum of the second circuit service is, for example, 60 MHz (ie, 63.6 MHz+3.6 MHz).

Based on the above teachings, the spectrum resource analysis module 42 can correspondingly obtain the adjusted upper limit of the transmission spectrum of the third circuit service, and the details are not described here.

Please refer to FIG. 3, which is a schematic diagram of adjusting the frequency band range according to the first and second embodiments of the present invention. In this embodiment, it is assumed that the adjusted upper limit values of the transmission spectrum from the first circuit service to the fourth circuit service are 30 MHz, 60 MHz, 106 MHz, and 212 MHz, respectively. That is, the frequency band served by the first circuit is adjusted from 2~212MHz to 2~30MHz, the frequency band served by the second circuit is adjusted from 2~212MHz to 2~60MHz, and the frequency band served by the third circuit is adjusted from 2~212MHz to 2~60MHz. 2~212MHz is adjusted to 2~106MHz, and the frequency band served by the fourth circuit ranges from 2~212MHz.

It can be seen from the left half of Figure 3 that when the frequency range of each circuit service is 2~212MHz, the highest speed 1G service will be reduced due to the increase in the number of vectorized operations, and it may even be impossible to provide 1G in severe cases. Service, or affect the 1G service supply distance.

However, through the method proposed by the present invention, the frequency band range of each circuit service can be adjusted to the state shown in the right half of FIG. 3. By reducing the transmission frequency bands of 100M, 300M, and 500M, the interference to the 1G service circuit (using 212MHz) can be reduced by the order of magnitude, thereby reducing the computational complexity of the vectorization of the 1G service, so as to improve the transmission performance and distance of the 1G service (relative to 300M, 500M service is also helpful).

In addition, although the above embodiment is described with the downstream transmission as an example, the method proposed by the present invention is also applicable to the upstream transmission. For example, in the aspect of uplink transmission, the preset transmission rates of the above-mentioned four circuit services are, for example, 40M, 100M, 250M, 600M, and those with ordinary knowledge in the art should be able to deduce the corresponding according to the teachings of the previous embodiments. The details of the spectrum adjustment method will not be repeated here.

In summary, the method and device proposed by the present invention can adjust the corresponding transmission frequency band range for different circuit services belonging to the first cable circuit technology (such as G.fast) on the cable circuit, thereby causing crosstalk interference from the copper cable technology. The level is reduced, and the transmission rate and the installation distance related to the first cable circuit technology are increased.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the relevant technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be determined by the scope of the attached patent application.

100: cable system 10: Cable client equipment 20: Cable circuit 30: Cable equipment room end equipment 40: Cable circuit spectrum adjustment device 41: Connection rate monitoring module 42: Spectrum Resource Analysis Module 43: Spectrum parameter setting module 50: Service and route database S210~S250: steps

Fig. 1 is a schematic diagram of a cable system according to an embodiment of the present invention. FIG. 2 is a flowchart of a method for adjusting the spectrum of a cable circuit according to an embodiment of the present invention. FIG. 3 is a schematic diagram of adjusting the frequency band range according to the first and second embodiments of the present invention.

S210~S250: steps

Claims (7)

A cable circuit spectrum adjustment method, suitable for a cable circuit spectrum adjustment device, includes: Monitor multiple cable circuits connected between a cable computer room end device and multiple cable user end devices, and obtain multiple circuit services associated with the cable circuits, where the cable computer room end device and the cable user end devices Is configured to apply a first electrical circuit technology, and each of the circuit services has a predetermined transmission rate and belongs to the first cable circuit technology; Determining a lower limit of the transmission spectrum served by the circuits according to the configuration of a specific circuit in the cable circuits, wherein the specific circuit applies a second cable circuit technology; Obtain a highest transmission frequency supported by the cable equipment room end equipment, and estimate an upper limit of the transmission spectrum of each circuit service based on the highest transmission frequency and a rate ratio corresponding to each circuit service; Measuring a service connection rate of each circuit service, and adjusting the corresponding upper limit of the transmission spectrum according to a rate difference between the service connection rate of each circuit service and the corresponding preset transmission rate; The cable equipment room end device is set according to the lower limit value of the transmission spectrum and the upper limit value of the transmission spectrum corresponding to each circuit service to adjust the spectrum range corresponding to each circuit service. According to the method described in item 1 of the scope of patent application, the first cable circuit technology is G.fast or G.mgfast, and the second cable circuit technology is VDSL2. In the method described in item 2 of the scope of patent application, the specific circuit includes a VDSL2 circuit, and the step of determining the lower limit value of the transmission spectrum served by the circuits according to the configuration of the specific circuit in the cable circuits includes: In response to determining that the VDSL2 circuit does not exist in the cable circuits, setting the lower limit of the transmission spectrum served by the circuits to the first value; In response to determining that the VDSL2 circuit exists in the cable circuits and the VDSL2 circuit belongs to the 17a specification, the transmission rate spectrum value of the circuit service is set to a second value, where the second value is higher than the first value; In response to determining that the VDSL2 circuit exists in the cable circuits, and the VDSL2 circuit belongs to the 30a specification, the transmission rate spectrum value of the circuit service is set to a third value, where the third value is higher than the second value. The method described in item 1 of the scope of patent application, wherein each of the circuit services has a preset transmission rate, the circuit services include the first circuit service to the Nmax circuit service, and the first circuit service reaches all The preset transmission rate of the Nmax circuit service is increasing, and the upper limit of the transmission spectrum of the Nth circuit service among the circuit services is characterized as:

, Where 1>N>Nmax,

The preset transmission rate serving the Nth circuit,

Is the highest transmission frequency supported by the equipment at the end of the cable room,

The preset transmission rate for the Nmax circuit service, where, for the Nmax circuit service, the corresponding upper limit of the transmission spectrum is the highest transmission frequency supported by the cable equipment room end device . The method described in item 1 of the scope of patent application, wherein the circuit services include a specific circuit service, and are adjusted according to the rate difference between the service connection rate of each circuit service and the corresponding preset transmission rate The steps corresponding to the upper limit of the transmission spectrum include: In response to determining that the service connection rate of the specific circuit service is lower than the predetermined transmission rate of the specific circuit service, the predetermined transmission rate of the specific circuit service minus the service connection rate of the specific circuit service is calculated as Estimate the rate difference corresponding to the specific circuit service, and estimate a correction value accordingly; The upper limit value of the transmission spectrum corresponding to the specific circuit service is added to the corresponding correction value to adjust the upper limit value of the transmission spectrum corresponding to the specific circuit service. The method described in item 1 of the scope of patent application, wherein the circuit services include a specific circuit service, and are adjusted according to the rate difference between the service connection rate of each circuit service and the corresponding preset transmission rate The steps corresponding to the upper limit of the transmission spectrum include: In response to determining that the service connection rate of the specific circuit service is higher than the preset transmission rate of the specific circuit service, the service connection rate of the specific circuit service minus the preset transmission rate of the specific circuit service is Estimate the rate difference corresponding to the specific circuit service, and estimate a correction value accordingly; The corresponding correction value is subtracted from the upper limit of the transmission spectrum corresponding to the specific circuit service to adjust the upper limit of the transmission spectrum corresponding to the specific circuit service. A cable circuit frequency spectrum adjustment device, including: A spectrum resource analysis module, which is configured to: Monitor multiple cable circuits connected between a cable computer room end device and multiple cable user end devices, and obtain multiple circuit services associated with the cable circuits, where the cable computer room end device and the cable user end devices Is configured to apply a first electrical circuit technology, and each of the circuit services has a predetermined transmission rate and belongs to the first cable circuit technology; Determining a lower limit of the transmission spectrum served by the circuits according to the configuration of a specific circuit in the cable circuits, wherein the specific circuit applies a second cable circuit technology; Obtain a highest transmission frequency supported by the cable equipment room end equipment, and estimate an upper limit of the transmission spectrum of each circuit service based on the highest transmission frequency and a rate ratio corresponding to each circuit service; A connection rate monitoring module that measures a service connection rate of each circuit service, wherein the spectrum resource analysis module is based on the relationship between the service connection rate of each circuit service and the corresponding preset transmission rate Adjust the corresponding upper limit of the transmission spectrum for a rate gap; A spectrum parameter setting module sets the cable equipment room end equipment according to the lower limit of the transmission spectrum and the upper limit of the transmission spectrum corresponding to each circuit service to adjust the spectrum range corresponding to each circuit service.

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