CN114124285A - PCM (pulse code modulation) multiplexing equipment for bearing multiple services and communication system - Google Patents
PCM (pulse code modulation) multiplexing equipment for bearing multiple services and communication system Download PDFInfo
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- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
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Abstract
The invention discloses a PCM multiplexing device for bearing multiple services, which comprises a microprocessor, a field programmable gate array module, a network interface module, an uplink E1 interface module and a downlink E1 interface module, wherein the microprocessor is connected with the field programmable gate array module; the field programmable gate array module comprises a configuration module and a service processing module, wherein the network interface module is connected with the microprocessor and the configuration module, the uplink E1 interface module is connected with the service processing module, the configuration module is connected with the microprocessor and the service processing module, and the service processing module is connected with the configuration module, the network interface module, the uplink E1 interface module and the downlink E1 interface module; the configuration module is used for determining the allocation rule of the time slot; and the service processing module is used for realizing the data transmission of the circuit service and the network service of the PCM multiplexing equipment. The invention can simultaneously bear and flexibly configure the circuit service and the network service in the same PCM multiplexing equipment, improve the utilization rate of the E1 link time slot and provide abundant and various value-added services.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a PCM multiplexing device and a communications system for carrying multiple services.
Background
In the power dispatching communication network, stations such as a transformer substation, a power plant, a power supply station and the like mainly utilize a local side equipment dispatching switch, and communication is realized after extension and number amplification of Pulse Code Modulation (PCM) multiplexing equipment. However, in the prior art, the PCM multiplexing apparatus has the following disadvantages:
1) the existing mainstream PCM multi-connection equipment manufacturers abroad and in the country do not produce PCM multi-connection equipment any more, and the PCM multi-connection equipment has the conditions of high exposure failure rate, difficult maintenance and insufficient supply;
2) except for the original circuit service, most PCM multiple connection equipment manufacturers are not good at the related technical fields of IP and circuit switches;
3) it cannot provide a function of a partial time slot tandem into one or two E1 channels in E1 of several tens of stations.
E1 is a coaxial cable interface standard, generally having a rate of 2.048Mbit/s, a frame length of 256 bits divided into 32 slots, and transmitting an IP (Internet Protocol, Internet interconnection Protocol) Protocol, referred to as IPOE (Internet Protocol over E1), through E1, mainly used for carrying network services, but in the prior art, an IPOE device has the following disadvantages:
1) IPoE equipment manufacturers are not good at the field of related products of circuit switching, cannot provide circuit services, and continue lives for original equipment of customers;
2) most of IPoE devices convert 1E 1 channel into one network port for transmission, and cannot realize convergence of multiple IPoE channels to one network port for output.
In summary, both of them cannot provide a complete set of solutions for communication technologies, and the device has a single function and cannot be flexibly configured for different application scenarios.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a PCM multiplexing device and a communication system for carrying multiple services, which can simultaneously carry circuit services and network services in the same PCM multiplexing device, can flexibly configure occupied time slots of the services according to different scenes, improve the utilization rate of an E1 link time slot, realize the convergence of time slots occupied by circuit services of a plurality of downlink E1 interface modules into one or two time slots occupied by uplink E1 interface modules, and realize the convergence of dozens of network channels formed by the remaining time slots of downlink E1 interfaces into a plurality of uplink network interfaces, thereby providing various value-added services.
In order to achieve the purpose, the invention adopts the following technical scheme:
a PCM multiplexing device for carrying multiple services, comprising: the system comprises a microprocessor, a field programmable gate array module, a network interface module, an uplink E1 interface module and a downlink E1 interface module;
the FPGA module comprises a configuration module and a service processing module, the network interface module is connected with the microprocessor and the configuration module, the uplink E1 interface module is connected with the service processing module, the configuration module is connected with the microprocessor and the service processing module, and the service processing module is connected with the configuration module, the network interface module, the uplink E1 interface module and the downlink E1 interface module; wherein:
the configuration module is used for receiving the instruction of the microprocessor to configure the time slot occupied by the circuit service and the network service; the service processing module is used for realizing data transmission of the circuit service and the network service of the PCM multiplexing equipment; the network interface module is used for receiving network data; the uplink E1 interface module comprises one or two uplink E1 interfaces for receiving data through the uplink E1 interface; the downlink E1 interface module comprises 32 downlink E1 interfaces, and is used for receiving data through the downlink E1 interface.
Furthermore, the service processing module comprises a time slot exchange matrix module, a time slot multiplexing module, a time slot demultiplexing module, an IPOE receiving module and an IPOE sending module.
Further, the network interface module is connected to the receiving module of the IPOE, the uplink E1 interface module is connected to the timeslot switching matrix, and the downlink E1 interface module is connected to the timeslot multiplexing module; the configuration module is connected with the time slot exchange matrix module, the IPOE receiving module, the time slot multiplexing module, the IPOE sending module and the time slot demultiplexing module, the time slot exchange matrix module is connected with the time slot multiplexing module, the time slot multiplexing module is connected with the IPOE module, and the time slot demultiplexing module is connected with the time slot exchange matrix module and the IPOE sending module; wherein:
further, the timeslot switching matrix module is configured to switch all timeslots in the uplink E1 interface module to timeslots of the downlink E1 interface module when the uplink E1 interface module transmits data to the downlink interface module, and merge timeslots occupied by the power circuit services of the multiple downlink E1 interface modules into one timeslot occupied by one or two uplink E1 interface modules when the downlink E1 interface module transmits data to the uplink E1 interface module;
the time slot multiplexing module is configured to multiplex time slots used by the circuit services and the network services received from the time slot switching matrix module and the IPOE receiving module to an E1 link, and send the time slots to the downlink E1 interface module;
the time slot demultiplexing module is configured to divide a time slot received from the downlink E1 interface module into time slots used by the circuit service and the network service, and send the time slots to the time slot switching matrix module and the IPOE sending module respectively;
the IPOE receiving module is used for converting the data packet which is received from the network interface module and conforms to the standard Ethernet protocol into a protocol packet transmitted by an E1 link, and determining a destination E1 interface of the data packet according to the set packet filtering rule;
and the IPOE sending module is used for converting the protocol packet transmitted by the E1 link into a data packet conforming to a standard Ethernet protocol and sending the data packet to the network interface.
Further, the network interface module comprises a physical layer chip and a network chip, the field programmable gate array module is connected with the network chip through a preset bus, and the network chip sends a data packet conforming to a preset network protocol to the IPOE receiving module.
Further, in the downlink E1 interface module, except for the time slot occupied by the circuit service, the remaining time slots of the downlink E1 interface form a network channel, and the network channel is sent to the network interface module through the time slot demultiplexing module and the IPOE sending module, and the network interface module communicates with the switch of the connected local device through the network channel.
As a preferred embodiment of the present invention, the present invention further provides a communication system including two PCM multiplexing devices as described above; the first PCM multiplexing device is a local side device, and the second PCM multiplexing device is a station side device.
Further, the office device is connected to the uplink E1 interface module of the station device through the downlink E1 interface module, and sends frame data with sync words to the station device through the downlink E1 interface module, so as to complete synchronization with the station device.
Further, the frame data includes two types, which are odd and even frames, respectively.
Further, after the office device and the station device are synchronized, the office device sends the configured IPOE occupation time slot to the station device, and negotiates with the station device about the IPOE occupation time slot.
Further, in the downlink E1 interface module, except for the time slot occupied by the circuit service, the remaining time slots of the downlink E1 interface form a network channel, and the network channel is sent to the network interface module through the time slot demultiplexing module and the IPOE sending module, and the network interface module communicates with the switch of the connected local device through the network channel.
Compared with the prior art, the PCM multiplexing device and the communication system for carrying multiple services disclosed by the embodiment of the invention can simultaneously carry circuit services and network services in the same multiplexing device by introducing the IPOE technology into the PCM multiplexing device, can flexibly configure the occupied time slots of the circuit services and the network services according to different scenes, improve the utilization rate of the E1 link time slots, realize that the time slots occupied by the circuit services of a plurality of downlink E1 interface modules are converged into the time slot occupied by one or two uplink E1 interface modules, and converge dozens of network channels formed by the remaining time slots of the downlink E1 interface into a plurality of uplink network interfaces, thereby providing rich and diverse value-added services.
Drawings
Fig. 1 is a schematic structural diagram of a PCM multiplexing device for carrying multiple services according to an embodiment of the present invention;
fig. 2 is a schematic diagram of module connections of a PCM multiplexing device for carrying multiple services according to an embodiment of the present invention;
fig. 3 is a schematic connection diagram of a communication system according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a principle that an uplink E1 interface timeslot of a PCM multiplexing device carrying multiple services is multiplexed into a downlink E1 interface timeslot according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, it is a schematic structural diagram of a PCM multiplexing device for carrying multiple services according to an embodiment of the present invention, and the PCM multiplexing device mainly includes the following modules: the system comprises a microprocessor, a field programmable gate array module, a network interface module, an uplink E1 interface module and a downlink E1 interface module.
The field programmable gate array module comprises a configuration module and a service processing module, wherein the network interface module is connected with the microprocessor and the configuration module, the uplink E1 interface module is connected with the service processing module, the configuration module is connected with the microprocessor and the service processing module, and the service processing module is connected with the configuration module, the network interface module, the uplink E1 interface module and the downlink E1 interface module.
The configuration module is used for receiving an instruction of the microprocessor to configure time slots occupied by circuit services and network services; the service processing module is used for realizing data transmission of circuit service and network service of the PCM multiplexing equipment; the network interface module is used for receiving network data; the uplink E1 interface module comprises one or two uplink E1 interfaces and is used for receiving data through an uplink E1 interface; and the downlink E1 interface module comprises 32 downlink E1 interfaces and is used for receiving data through the downlink E1 interface.
The PCM multiplexing equipment for bearing multiple services disclosed by the embodiment of the invention can simultaneously bear circuit services and network services in the same multiplexing equipment by introducing an IPOE technology into the PCM multiplexing equipment, can flexibly configure the occupied time slots of the circuit services and the network services according to different scenes, improves the utilization rate of E1 link time slots, realizes the purpose of converging the time slots occupied by the circuit services of a plurality of downlink E1 interface modules into the time slot occupied by one or two uplink E1 interface modules, and converges dozens of network channels formed by the residual time slots of the downlink E1 interface into a plurality of uplink network interfaces, thereby providing rich and various value-added services.
Fig. 2 is a schematic diagram of module connection of a PCM multiplexing device carrying multiple services according to an embodiment of the present invention.
Furthermore, the service processing module comprises a time slot exchange matrix module, a time slot multiplexing module, a time slot demultiplexing module, an IPOE receiving module and an IPOE sending module.
The network interface module is connected with the IPOE receiving module, the uplink E1 interface module is connected with the time slot exchange matrix, and the downlink E1 interface module is connected with the time slot multiplexing module; the configuration module is connected with the time slot exchange matrix module, the IPOE receiving module, the time slot multiplexing module, the IPOE sending module and the time slot demultiplexing module, the time slot exchange matrix module is connected with the time slot multiplexing module, the time slot multiplexing module is connected with the IPOE module, and the time slot demultiplexing module is connected with the time slot exchange matrix module and the IPOE sending module.
Further, the time slot switching matrix module is configured to switch all time slots in the uplink E1 interface module to time slots of the downlink E1 interface module when the uplink E1 interface module transmits data to the downlink interface module, and join time slots occupied by circuit services of multiple downlink E1 interface modules into one or two time slots occupied by the uplink E1 interface module when the downlink E1 interface module transmits data to the uplink E1 interface module.
And the time slot multiplexing module is used for multiplexing the time slots used by the circuit services and the network services received from the time slot switching matrix module and the IPOE receiving module to an E1 link and sending the time slots to the downlink E1 interface module.
And the time slot demultiplexing module is used for dividing the time slot received from the downlink E1 interface module into time slots used by circuit services and network services and respectively sending the time slots to the time slot switching matrix module and the IPOE sending module.
And the IPOE receiving module is used for converting the data packet which is received from the network interface module and conforms to the standard Ethernet protocol into a protocol packet transmitted by an E1 link, and determining a destination E1 interface of the data packet according to the set packet filtering rule.
And the IPOE sending module is used for converting the protocol packet transmitted by the E1 link into a data packet conforming to the standard Ethernet protocol and sending the data packet to the network interface.
Furthermore, the network interface module comprises a physical layer chip and a network chip, the field programmable gate array module is connected with the network chip through a preset bus, and the network chip sends a data packet which accords with a preset network protocol to the IPOE receiving module.
It should be noted that, in specific implementation, the preset bus and the preset network protocol may be defined according to actual needs, and only the preset bus and the preset network protocol need to be ensured to meet the data transmission requirement, which is not limited herein.
In a specific embodiment, the network interface module includes a physical layer chip and a network chip, the field programmable gate array module is connected to the network chip through a GMII bus, and the network chip sends a data packet conforming to a standard ethernet protocol to the IPOE receiving module.
It should be noted that in this embodiment, the service processing module is used to implement communication connection with the configuration module, the network interface module, the uplink E1 interface module, and the downlink E1 interface module, so that the same multiplexing device can simultaneously carry circuit services and network services.
Fig. 3 is a schematic connection diagram of a communication system according to an embodiment of the present invention.
The communication system comprises two PCM multiplexing devices; the first PCM multiplexing device is a local side device, and the second PCM multiplexing device is a station side device.
Illustratively, the local side is generally a reference to equipment placed in a communication office, a central office, or the like, and the station side is a reference to end equipment placed in a station, a power plant, or the like.
Furthermore, the office device is connected to the uplink E1 interface module of the station device through the downlink E1 interface module, and sends frame data with sync words to the station device through the downlink E1 interface module, so as to complete synchronization with the station device.
Further, the frame data includes two types, odd and even frames, respectively.
Further, after the office device and the station device are synchronized, the office device sends the configured IPOE occupied time slot to the station device, and negotiates with the station device about the IPOE occupied time slot.
The communication system disclosed by the embodiment of the invention realizes the communication tasks of the circuit service and the network service between two PCM multiplexing devices by arranging the two PCM multiplexing devices, wherein one PCM multiplexing device is a local side device and the other PCM multiplexing device is a station side device, can flexibly configure the occupied time slots of the circuit service and the network service according to different scenes, improves the utilization rate of the E1 link time slot, realizes the convergence of the time slots occupied by the circuit services of a plurality of downlink E1 interface modules into the time slot occupied by one or two uplink E1 interface modules, and converges dozens of network channels formed by the residual time slots of the downlink E1 interface into a plurality of uplink network interfaces, thereby providing rich and diversified value-added services.
Illustratively, in the PCM multiplexing device, the main configuration process of time slots occupied by circuit traffic and network traffic is as follows:
the local side equipment sends a data packet containing occupied time slot information to a physical layer chip of a network interface module through a network protocol, then sends the data packet to a microprocessor through the network chip, the microprocessor analyzes the received data packet to obtain the number of time slots occupied by circuit services in each downlink E1 interface, then writes the obtained number of time slots into a time slot multiplexing module and a time slot switching matrix through a configuration module, the time slot multiplexing module enables the number of the received time slots to pass through a downlink E1 interface module, configures time slots occupied by the circuit services of a downlink E1 interface of a downlink E1 interface module, and sends the time slots to the station side equipment through frame data with synchronous words, after the station side equipment receives the data, the station side equipment completes synchronization with the local side equipment, receives the number of the time slots occupied by the circuit services of the downlink E1 interface of the local side equipment, and after configuring the time slots occupied by the circuit services of the downlink E1 interface of the downlink E1 interface module of the local side equipment, by calculating the number of time slots occupied by the network service, the calculated number of time slots can be used for carrying the network service. The method for calculating the time slot occupied by the network service comprises the following steps: and after the number of the time slots occupied by the circuit service is known, subtracting 1 synchronous time slot from the total 32 time slots, and subtracting the number of the time slots occupied by the circuit service, namely the number of the time slots occupied by the network service.
Further, there are two types of frame data with sync words sent by the office device through the downstream E1 interface module, which are odd frames and even frames, respectively, and data transmission is performed in the E1 channel in a framing manner, where E1 channel data is divided into 32 slots, the 0 th slot is used as a frame synchronization slot, and bit distribution of the frame synchronization slot is shown in table 1 below.
TABLE 1
In the table, note 1, note 2, note 3, and note 4 mean:
note 1: si is used as an International use reserved word in ITU (International telecommunications Union) recommendations and in practice is commonly used as a CRC check.
Note 2: bit 2 of the odd frame is fixed to 1 to avoid the occurrence of pseudo-synchronization codes.
Note 3: a1 in bit 3 of the odd frame indicates the far-end alarm information, and is 0 when normal and 1 when alarm information occurs.
Note 4: by using the bits from Sa4 to Sa8, the office side device and the station side device perform negotiation of IPOE occupation time slot.
The synchronization information of the station side device and the local side device and the information of the occupied time slot are stored in the original frame synchronization time slot in the E1 channel, and the resources of other time slots are not occupied.
Further, in the PCM multiplexing device, the data transmission process from the upstream E1 interface module to the downstream E1 interface module is as follows:
the microprocessor exchanges the number of time slots occupied by the circuit service received from the uplink E1 interface module to the time slot of the E1 interface of the corresponding downlink E1 interface module through the time slot exchange matrix, wherein in the configuration process, the configuration module already informs the time slot exchange matrix of the number of time slots occupied by the circuit service in each downlink E1 interface in advance, so that the time slot exchange matrix can accurately allocate all the time slots in the uplink E1 interface to different downlink E1 interfaces.
As shown in fig. 4, a schematic diagram of multiplexing an uplink E1 interface timeslot of a PCM multiplexing device carrying multiple services to a downlink E1 interface timeslot according to an embodiment of the present invention is provided, where all timeslots of an E1 interface of an uplink E1 interface module are used as circuit services, and timeslots occupied by an uplink E1 interface are multiplexed to a corresponding timeslot of an E1 interface of a downlink E1 interface module, and then other timeslots may be used as timeslots occupied by network services.
Further, in the PCM multiplexing device, the process of transmitting data from the network data interface to the downstream E1 interface module is as follows:
the network interface receives external data packets and sends the external data packets to the IPOE receiving module through the network chip, the IPOE receiving module converts the data packets which conform to the standard Ethernet protocol into data packets which are transmitted on an E1 link after receiving the data packets, then a target MAC address in the data packets is obtained through a set filtering rule of the data packets, a MAC address table stored in an E1 interface of each downlink E1 interface module is searched and matched, if matched MAC addresses are found, the data packets are sent to an E1 interface corresponding to the MAC addresses, and if no matching is found, the network data packets are broadcasted to all the E1 interfaces.
Further, in the PCM multiplexing device, the process of transmitting data from the downstream E1 interface module to the upstream E1 interface module and the network interface module is as follows:
after receiving the data, the E1 interface of the downlink E1 interface module sends the data to the time slot demultiplexing module, and the time slot demultiplexing module divides a time slot on an E1 link into a time slot used by a circuit service and a time slot used by a network service, and sends the time slots to the time slot switching matrix and the IPOE sending module respectively.
The time slot exchange matrix sends the time slot occupied by the received circuit service to the uplink E1 interface module, and the uplink E1 interface module is connected to the local exchange and can provide the original circuit service.
And the IPOE sending module sends the time slot occupied by the received network service to the network interface module.
Further, in the downlink E1 interface module, except the time slot occupied by the circuit service, the remaining time slots of the downlink E1 interface form a network channel, and the network channel is sent to the network interface module through the time slot demultiplexing module and the IPOE sending module, and the network interface module communicates with the switch of the connected local device through the network channel.
In summary, the PCM multiplexing device and the communication system for carrying multiple services disclosed in the embodiments of the present invention include a field programmable gate array module, a microprocessor, a network interface module, an uplink E1 interface module, and a downlink E1 interface module; the field programmable gate array module comprises a configuration module and a service processing module, wherein the network interface module is connected with the microprocessor and the configuration module, the uplink E1 interface module is connected with the service processing module, the configuration module is connected with the microprocessor and the service processing module, and the service processing module is connected with the configuration module, the network interface module, the uplink E1 interface module and the downlink E1 interface module; the configuration module is used for determining the allocation rule of the time slot; the service processing module is used for realizing data transmission of circuit service and network service of the PCM multiplexing equipment; the network interface module is used for receiving network data; the uplink E1 interface module comprises one or two uplink E1 interfaces and is used for receiving data through an uplink E1 interface; and the downlink E1 interface module comprises 32 downlink E1 interfaces and is used for receiving data through the downlink E1 interface.
The IPOE technology is introduced into the PCM multiplexing equipment, so that the circuit service and the network service can be simultaneously carried in the same PCM multiplexing equipment, the occupied time slots of the circuit service and the network service are flexibly configured according to different scenes, the utilization rate of the E1 link time slot is improved, the time slots occupied by the circuit services of a plurality of downlink E1 interface modules can be converged into one or two time slots occupied by uplink E1 interface modules, a plurality of network channels formed by the residual time slots of the downlink E1 interface modules are converged into a plurality of uplink network interfaces, and the uplink network interfaces are connected to a local side network switch through the uplink network interface modules, so that various value-added services are provided.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A PCM multiplexing device for carrying multiple services, comprising: the system comprises a microprocessor, a field programmable gate array module, a network interface module, an uplink E1 interface module and a downlink E1 interface module;
the FPGA module comprises a configuration module and a service processing module, the network interface module is connected with the microprocessor and the configuration module, the uplink E1 interface module is connected with the service processing module, the configuration module is connected with the microprocessor and the service processing module, and the service processing module is connected with the configuration module, the network interface module, the uplink E1 interface module and the downlink E1 interface module; wherein:
the configuration module is used for determining the allocation rule of the time slot and configuring the time slot occupied by the circuit service and the network service; the service processing module is used for realizing data transmission of the circuit service and the network service of the PCM multiplexing equipment; the network interface module is used for receiving network data; the uplink E1 interface module comprises one or two uplink E1 interfaces for receiving data through the uplink E1 interface; the downlink E1 interface module comprises 32 downlink E1 interfaces, and is used for receiving data through the downlink E1 interface.
2. The PCM multiplexing device according to claim 1, wherein the service processing module comprises a time slot switching matrix module, a time slot multiplexing module, a time slot demultiplexing module, an IPOE receiving module, and an IPOE transmitting module.
3. The PCM multiplexing device according to claim 2, wherein said network interface module is connected to said IPOE receiving module, said uplink E1 interface module is connected to said time slot switching matrix, said downlink E1 interface module is connected to said time slot multiplexing module, said configuration module is connected to said time slot switching matrix module, said IPOE receiving module, said time slot multiplexing module, said IPOE transmitting module, and said time slot demultiplexing module, said time slot switching matrix module is connected to said time slot multiplexing module, said time slot multiplexing module is connected to said IPOE module, and said time slot demultiplexing module is connected to said time slot switching matrix module and said IPOE transmitting module.
4. The PCM multiplexing device according to claim 3, wherein said time slot switching matrix module is configured to switch all time slots in said upstream E1 interface module to time slots of said downstream E1 interface module when said upstream E1 interface module transmits data to said downstream interface module, and to merge time slots occupied by said power circuit traffic of said plurality of downstream E1 interface modules into time slots occupied by one or two upstream E1 interface modules when said downstream E1 interface module transmits data to said upstream E1 interface module;
the time slot multiplexing module is configured to multiplex time slots used by the circuit services and the network services received from the time slot switching matrix module and the IPOE receiving module to an E1 link, and send the time slots to the downlink E1 interface module;
the time slot demultiplexing module is configured to divide a time slot received from the downlink E1 interface module into time slots used by the circuit service and the network service, and send the time slots to the time slot switching matrix module and the IPOE sending module respectively;
the IPOE receiving module is used for converting the data packet which is received from the network interface module and conforms to the standard Ethernet protocol into a protocol packet transmitted by an E1 link, and determining a destination E1 interface of the data packet according to the set packet filtering rule;
and the IPOE sending module is used for converting the protocol packet transmitted by the E1 link into a data packet conforming to a standard Ethernet protocol and sending the data packet to the network interface.
5. The PCM multiplexing device according to claim 1, wherein the network interface module comprises a physical layer chip and a network chip, the field programmable gate array module is connected with the network chip through a preset bus, and the network chip sends a data packet conforming to a preset network protocol to the IPOE receiving module.
6. A communication system comprising two PCM multiplexing devices according to any one of claims 1 to 5; the first PCM multiplexing device is a local side device, and the second PCM multiplexing device is a station side device.
7. The communication system according to claim 6, wherein the central office device is connected to the upstream E1 interface module of the station-side device through a downstream E1 interface module, and sends the frame data with the sync word to the station-side device through the downstream E1 interface module, so as to complete synchronization with the station-side device.
8. The communication system of claim 7, wherein the frame data comprises two types, respectively odd and even frames.
9. The communication system of claim 8, wherein after the office device and the station-side device are synchronized, the office device sends the configured IPOE occupied time slot to the station-side device, and negotiates the IPOE occupied time slot with the station-side device.
10. The PCM multiplexing device according to any of claims 1 to 5, wherein in the downstream E1 interface module, the remaining time slots of the downstream E1 interface except the time slots occupied by the circuit traffic form a network channel, and the network channel is transmitted to the network interface module through the time slot demultiplexing module and the IPOE transmission module, and the network interface module communicates with the switch of the connected local device through the network channel.
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