KR100650577B1 - Apparatus and method for multiplex and demultiplex of data communication channel in synchronous optical subscriber transmission system - Google Patents

Abstract

The present invention provides an apparatus and method for multiplexing and demultiplexing a data communication channel in a synchronous optical subscriber network transmission system, comprising: a DCC multiplexing and demultiplexing unit for multiplexing and demultiplexing a DCC signal; By including a frame alignment unit connected to the DCC multiplexing and demultiplexing unit to perform frame alignment, a unit such as STM-1, STM-4, etc. for interoperation of a plurality of synchronous digital boundary signals is mounted and operated in a system. The data communication channel backplane of the time-efficient synchronous optical subscriber network transmission system can be designed.

Description

Apparatus and method for multiplex and demultiplex of data communication channel in synchronous optical subscriber transmission system in synchronous optical subscriber network transmission system

1 is a block diagram of a data communication channel processing apparatus with HDLC in a conventional synchronous optical subscriber network transmission system,

2 is a block diagram of a data communication channel processing apparatus without HDLC in a conventional synchronous optical subscriber network transmission system.

3 is a block diagram of an apparatus for multiplexing and demultiplexing a data communication channel in a synchronous optical subscriber network transmission system according to an embodiment of the present invention;

4 is a detailed block diagram of a DCC multiplexing and demultiplexing unit of FIG. 3;

FIG. 5 is a detailed block diagram of the control unit in FIG. 3;

6 is a flowchart illustrating a multiplexing and demultiplexing method of a data communication channel in a synchronous optical subscriber network transmission system according to an embodiment of the present invention.

7 is a flowchart illustrating a multiplexing and demultiplexing method of a data communication channel in a synchronous optical subscriber network transmission system according to an embodiment of the present invention;

8 is a structural diagram showing an example of a frame structure used in the present invention,

9 is a block diagram showing an example of the configuration when the present invention is applied to a synchronous optical subscriber network transmission system.

Explanation of symbols on the main parts of the drawings

31, 32: STM-1 unit 33, 34: STM-4 unit

35 control unit 36 processor

37: frame alignment unit 40: DCC multiplexing and demultiplexing unit

41: counter 42, 45: first flag / idle pattern removing unit

43, 46: buffer 44, 47: flag insertion unit

51: oscillator 52: communication port

61 to 63: embodiment of DCC multiplexing and demultiplexing frame structure

71 to 73: embodiment of a system configuration to which the present invention is applicable

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for multiplexing and demultiplexing a data communication channel (DCC) in a synchronous optical subscriber network transmission system, and in particular, to a plurality of synchronous digital hierarchy (SDH) signals. Units such as STM-1 (Synchronous Transport Module level 1, 155.52Mbps) and STM-4 (Synchronous Transport Module level 4, Synchronous Transport Module 4 (622.08Mbps)) for interface The present invention relates to an apparatus and method for multiplexing and demultiplexing a data communication channel in a synchronous optical subscriber network transmission system suitable for designing a data communication channel backplane of an efficient synchronous optical subscriber network transmission system.

In general, synchronous transmission refers to a communication type in which a receiving device and a transmitting device continuously operate at the same frequency and adjust or supplement phases at regular intervals. The optical subscriber network transmission system refers to both optical end station devices, optical relay devices, and optical fiber cables when optical transmission is performed to optical end station devices facing each other, and means all transmission media between optical end station devices.

The optical subscriber network transmission system for synchronous digital hierarchy signals extracts and inserts data communication channels (DCCs) from the overhead section for network operation and management. Interoperate with your processor.

At this time, in the optical subscriber network transmission system of the synchronous digital hierarchy signal, the transmission data of individual STM-1, STM-4 unit or unit unit from a plurality of STM-1, STM-4 mutual interface unit to the control unit Data Communication Channel Data signal and clock signal, Received Data Communication Channel Data signal and clock signal are connected to HDLC (High-level Data Link Control) controller of control unit by hardware wiring, HDLC The interface between the controller and the processor's communication port has been used.

Other methods that do not use the HDLC controller include a serial communication port that can be used as a data communication channel among the serial communication controllers of the processor. Clock Signals, Received Data Communication Channels Data signals and clock signals are wired in hardware and linked to a processor.

1 is a block diagram of a data communication channel processing apparatus with HDLC in a conventional synchronous optical subscriber network transmission system.

Here, reference numerals 11 and 12 are STM-1 units performing the STM-1 interface, 13 and 14 are STM-4 units performing the STM-4 interface, 15 are control units, and 16 are PowerPCs located in the control unit. It is a family of processors, and 17 is an HDLC control unit.

2 is a block diagram of a data communication channel processing apparatus without HDLC in a conventional synchronous optical subscriber network transmission system.

Here, reference numerals 21 and 22 are STM-1 units performing the STM-1 interface, 23 and 24 are STM-4 units performing the STM-4 interface, 25 are control units, and 26 are PowerPCs located in the control unit. It is a family of processors, and 27 is a serial communication port.

The operation of the prior art configured as described above will be described in detail with reference to the accompanying drawings.

First, in FIG. 1, the STM-1 units 11 and 12 and the STM-4 units 13 and 14 of the plurality of synchronous digital phase signals are extracted and inserted in an overhead part for network operation and management. The data communication channel is composed of a transmission DCC data signal and a clock signal, and a reception DCC data signal and a clock signal.

Each unit from # 1 to #N (11, 12) of the STM-1 unit and # 1 to #M (13, 14) of the STM-4 unit transmits a DCC data signal for its own data communication channel. And wires are connected to the HDLC control unit 17 of the control unit unit 15 by hardware and the clock signal, the received DCC data signal and the clock signal, respectively, and the HDLC control unit 17 interoperates with the communication port of the processor 16. do.

Meanwhile, in FIG. 2, the HDLC control unit is removed from the control unit 25, and as many STM-1 units 21 and 22 or STM-4 units are available as the number of serial communication ports 27 of the serial communication controller of the processor 26. The transmission DCC data signal and clock signal of 23 and 24, and the reception DCC data signal and clock signal are directly wired to the corresponding communication port and interlocked with each other.

However, this conventional technology has the following problems.

First, in the prior art as shown in FIG. 1, since 4 lines (transmitting DCC data signal and clock signal, receiving DCC data signal and clock signal) per unit are required for the backplane, a total of 4 x (N + M) (N: 0 to N STM-1 unit, M: 0 to M STM-4 unit) Hardware wiring is required.

In this case, if there are many unit mountings such as STM-1 and STM-4, too much wiring is required on the backplane, which makes it impossible to design the backplane efficiently and inefficiently increases the backplane.

For example, if 8 units of STM-1 units (11, 12) are mounted and 4 units of STM-4 units (13, 14) are installed, total 4 x (8 + 4) = 96 hardware units. Wiring is required.

On the other hand, the prior art as shown in FIG. 2 is a DCC processing method that does not require an HDLC controller, but can process data communication channels as many as the number of serial communication ports that can be used as data communication channels among the serial communication controllers of a processor. In practice, there are limitations in handling data communication channels of multiple STM-1 units and STM-4 units.

For example, up to four serial communication channels are available for the MPC860 processor. Even if all of them are used as data communication channels, only a maximum of four STM-1 units or STM-4 units of data communication channels can be processed.

Therefore, the present invention has been proposed to solve the conventional problems as described above, and an object of the present invention is to mount a unit such as STM-1, STM-4, etc. for the mutual interface of a plurality of synchronous digital step signal An apparatus and method for processing multiplexing and demultiplexing of a data communication channel in a synchronous optical subscriber network transmission system that can design an efficient data communication channel backplane of an synchronous optical subscriber network transmission system in operation.

In order to achieve the above object, an embodiment of the present invention is an optical subscriber network transmission system for processing digital phase signals, which is mounted on a backplane device of the transmission system, and includes a DCC multiplexing and demultiplexing unit integrally. The plurality of units are provided with a plurality of units for multiplexing / demultiplexing signals to interface with each other, and a frame aligning unit for arranging frames connected to and inputted through a backplane to the DCC multiplexing and demultiplexing units of the plurality of units. Provided is a multiplexing and demultiplexing apparatus for a data communication channel in a synchronous optical subscriber network transmission system including a controlling unit for controlling.

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Another embodiment of the present invention to achieve the above object is to extract a time slot for a slot of the unit in the data communication channel with a frame pulse signal, clock, slot ID in the optical subscriber network transmission system And a second step of removing flags and idle patterns from the HDLC format data after the first step, and then storing normal data in the dual port buffer. Provides a multiplexing method.

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Hereinafter, an embodiment according to the present invention, the apparatus for multiplexing and demultiplexing a data communication channel and a method thereof in a synchronous optical subscriber network transmission system will be described with reference to the accompanying drawings.

3 is a block diagram of an apparatus for multiplexing and demultiplexing a data communication channel in a synchronous optical subscriber network transmission system according to an embodiment of the present invention, and FIG. 4 is a detailed block diagram of a DCC multiplexing and demultiplexing unit in FIG. 5 is a detailed block diagram of the controller unit of FIG. 3.

As shown therein, the DCC multiplexing and demultiplexing unit 40 multiplexes and demultiplexes DCC signals; And a frame alignment unit 37 connected to the DCC multiplexing and demultiplexing unit 40 to perform frame alignment.

In the above, the DCC multiplexing and demultiplexing unit 40 is installed on the STM-1 units 31 and 32.

In the above, the DCC multiplexing and demultiplexing unit 40 is installed on the STM-4 units 33 and 34.

In the above, the DCC multiplexing and demultiplexing unit 40, from the data communication channel (DCC) signal multiplexed into a constant data stream into a slot of the corresponding STM-1 unit (31, 32) or STM-4 unit (33, 34) Demultiplex the corresponding timeslot, transmit the data communication channel at the timing that matches the synchronization clock of the STM-1 unit (31, 32) or STM-4 unit (33, 34) through buffering, It buffers the data communication channel extracted from the overhead in accordance with the synchronous clock of the corresponding STM-1 unit (31, 32) or the STM-4 unit (33, 34), and applies the corresponding STM-1 unit (31, 32) to a constant data stream. Or multiplexing into timeslots corresponding to the slots of the STM-4 units 33 and 34.

In the above, the DCC multiplexing and demultiplexing unit 40 includes: a count 41 for counting signals of the DCC to be transmitted and received; A flag / idle pattern remover 42 or 45 which removes a flag and an idle pattern upon receiving data in an HDLC format; Dual port buffers 43 and 46 for storing DCC signals; The dual port buffers 43 and 46 include flag inserters 44 and 47 for inserting flags when outputting signals.

The frame aligning unit 37 is characterized in that it is provided in the control unit 35 for controlling the operation of the STM-1 unit 31, 32 or the STM-4 unit 33, 33.

The control unit 35 includes an oscillator 51 for supplying a clock to the frame alignment unit 37; It further comprises a processor 36 having a communication port 52 that is connected to the frame alignment unit 37.

In the above, the frame aligner 37 generates frame pulses and clocks for all the unit slots and the TDM interface of the processor, and arranges a predetermined data communication channel input and output in the backplane to form an interface with the processor. Doing includes performing.

6 is a flowchart illustrating a multiplexing and demultiplexing method of a data communication channel in a synchronous optical subscriber network transmission system according to an embodiment of the present invention.

As shown therein, a first step ST1 of extracting a time slot corresponding to a slot of a corresponding unit from a data communication channel using a frame pulse signal, a clock, and a slot ID; After the first step, a flag and an idle pattern are removed from the data in the HDLC format, and then the second steps ST2 and ST3 are stored in the dual port buffers 43 and 46.

In the synchronous optical subscriber network transmission system, the multiplexing and demultiplexing processing method of the data communication channel includes an STM-1 unit (31, 32) or an STM-4 unit if data exists in the transmission buffer 43 after the second step. The method further includes a third step (ST4 to ST6) of timing output to the data communication channel clock corresponding to the synchronization clock of (33, 34) and inserting a flag.

7 is a flowchart illustrating a multiplexing and demultiplexing method of a data communication channel in a synchronous optical subscriber network transmission system according to an embodiment of the present invention.

As shown therein, the eleventh steps ST11 and ST12 remove the flag and the idle pattern upon receiving the data; After the eleventh step, a twelfth step ST13 of storing normal data in the dual port buffers 43 and 46 is performed.

In the synchronous optical subscriber network transmission system, a multiplexing and demultiplexing method of a data communication channel includes a thirteenth step of outputting a clock and inserting a flag when data exists in a receiving buffer after the twelfth step (ST14 to ST16). More).

Operation of the multiplexing and demultiplexing apparatus and method of a data communication channel in a synchronous optical subscriber network transmission system according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First of all, the present invention is to design a data communication channel backplane of a synchronous optical subscriber network transmission system that is efficient when a unit such as STM-1, STM-4, etc. is installed in a system for mutual interface of a plurality of synchronous digital hierarchy signals.

Therefore, the DCC multiplexing and demultiplexing unit 40 is configured to convert the STM-1 units 31 and 32 and the STM-4 units 33 and 34 of the synchronous digital step signal from the data communication channel signal multiplexed into a data stream of 2 Mbps. Demultiplex the timeslot corresponding to the slot of. In addition, the DCC multiplexing and demultiplexing unit 40 performs a function of transmitting a data communication channel at a timing that matches the synchronization clock of the corresponding STM-1 unit 31 or 32 or the STM-4 unit 33 or 34 through buffering. do. In addition, the DCC multiplexing and demultiplexing unit 40 buffers the data communication channel extracted from the overhead according to the synchronous clock of the corresponding STM-1 unit 31 or 33 or the STM-4 unit 33 or 34, and performs a 2Mbps Performs a receiving function of multiplexing the data stream into timeslots corresponding to the corresponding unit slots.

In addition, the frame aligning unit 37 is provided in the control unit 35, generates the frame pulse and clock for the TDM interface of all the unit slots and the processor, and arranges the data communication channel of 2Mbps input and output in the backplane processor Smooth interaction with 36.

Referring to the operation of the present invention in more detail as follows.

First, the frame aligning unit 37 of the control unit 35 transmits an 8 KHz frame pulse signal and a 2 MHz clock for the data communication channel in the system to the TDM interface unit of the processor 36 of the control unit 35 (not shown in the drawing). And STM-1 units (31, 32) and STM-4 units (33, 34) of the synchronous digital step signal are commonly provided.

The frame aligner 37 also interfaces the multiplexed transmit / receive 2Mbps data communication channel to the communication port 52 of the processor 36 in a timing-aligned state.

In addition, the DCC multiplexing and demultiplexing unit 40 of the STM-1 units 31 and 32 or the STM-4 units 33 and 34 mounted in the system slot is configured to provide a frame pulse signal of 8 KHz, a clock of 2 MHz, and a slot ID. Extract the time slot that matches the unit slot from the data communication channel of 2Mbps.

Then, the flag and idle pattern are removed from the HDLC format data by the first flag / idle pattern remover 42, and only normal data is stored in the dual port buffers 43 and 46.

Thus, if data exists in the transmit buffer 43, the data is transmitted from the dual port buffer in synchronization with the clock of the data communication channel corresponding to the synchronous clock of the STM-1 unit 31 or 32 or the STM-4 unit 33 or 34. The flag is inserted again by the first flag inserter 44.

On the contrary, before the data communication channel is stored in the dual port buffer with the communication channel clock corresponding to the synchronization clock in the unit, the second flag / idle pattern removing unit 45 removes the flag and the idle pattern, and the dual port buffer 43 , 46) ensure that only normal data is stored.

When there is data from the reception buffer 46 in the time slot corresponding to the slot of the unit, the data is output as a clock of 2 MHz of the backplane, and the flag is inserted by the second flag inserter 47 again.

The reason for eliminating the HDLC flag and idle pattern when storing data in the dual port buffers 43 and 46 is that the clock for the interface with the backplane and the data communication channel clock inside the unit are asynchronous, which is unnecessary to prevent data loss. To eliminate the data and have a timing margin.

As described above, the present invention is to design a data communication channel backplane of the synchronous optical subscriber network transmission system that is effective when the units such as STM-1, STM-4 for the mutual interface of the synchronous digital hierarchy signal is mounted in the system.

8 is a structural diagram showing an example of a frame structure used in the present invention.

Here, reference numeral 61 is Embodiment 1 of the DCC multiplexing and demultiplexing frame structure, 62 is Embodiment 2 of the DCC multiplexing and demultiplexing frame structure, and 63 is Embodiment 3 of the DCC multiplexing and demultiplexing frame structure.

Thus, the frame structure of 2Mbps for the backplane interface may have various frame structures as shown by reference numerals 61 to 63 according to the number of units of the synchronous digital boundary signal to be mounted, and various frame structures using the same are possible. It is also possible to design a plurality of backplanes having such a 2Mbps frame structure as needed.

9 is a block diagram showing an example of the configuration when the present invention is applied to a synchronous optical subscriber network transmission system.

Reference numerals 71 to 73 show examples of system shapes to which the present invention is applicable.

Therefore, in the synchronous optical subscriber network transmission system (e.g., FLC (Fiber Loop Carrier), MSPP (Multi Service Provision Platform, etc.), it is required to mount STM-1 units and STM-4 units of synchronous digital phase signals. Synchronous optical subscriber network to smoothly handle data communication channels (DCC) in central base station 73 or remote base station systems 71 and 72 that require miniaturization and improve system performance by simplifying backplane design Applicable to the transmission system.

Also, it is located in the central base station or remote base station, and it is a box type that is applied to the self-type system 71 and the small remote base station system when 4 units including the STM-1 unit or the STM-4 unit are mounted. The system 72 and the form of the multi-service provisioning platform (MSPP) system 73 of the central base station are another embodiment of the invention.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, in the synchronous optical subscriber network transmission system according to the present invention, an apparatus for multiplexing and demultiplexing a data communication channel and a method thereof include STM-1, STM-4, and the like for mutual interface of a plurality of synchronous digital hierarchy signals. Is installed in the system, which makes it possible to design an efficient data communication channel backplane for the synchronous optical subscriber network transmission system.

In addition, the present invention is to effectively handle the data communication channel (DCC) of the STM-1 unit, STM-4 unit of a plurality of synchronous digital phase signal in the synchronous optical subscriber network transmission system to enable the effective design of the backplane, and the system structure Simplify and have a price advantage.

Claims (12)

In the optical subscriber network transmission system for processing digital phase signals, A plurality of units mounted on the backplane device of the transmission system and having a DCC multiplexing and demultiplexing unit integrally to interface with each other by multiplexing / demultiplexing digital phase signals; A synchronous optical subscriber network comprising a control unit for controlling the plurality of units having a frame alignment unit for connecting the input and output of the frame connected to the DCC multiplexing and demultiplexing unit of the plurality of units via a backplane Apparatus for multiplexing and demultiplexing data communication channels in a transmission system. delete delete The method of claim 1, wherein the DCC multiplexing and demultiplexing unit demultiplexes and buffers a data communication channel signal multiplexed into a constant data stream into a time slot corresponding to a slot of a unit using the STM-1 or STM-4 scheme. Transmits the data communication channel at a timing that matches the synchronization clock of the unit using the STM-1 or STM-4 scheme, and transmits the data communication channel to the synchronization clock of the unit using the STM-1 or STM-4 scheme. And buffering the data communication channel extracted from the overhead, and multiplexing the data communication channel to a time slot corresponding to a slot of a unit using a corresponding STM-1 or STM-4 method to a predetermined data stream. Device for multiplexing and demultiplexing data communication channels in a subscriber network transmission system. The DCC multiplexing and demultiplexing unit of claim 1, wherein the DCC multiplexing and demultiplexing unit stores a count to count signals of the DCC to be transmitted and received, a flag / idle pattern removing unit to remove a flag and an idle pattern upon receiving data in HDLC format, and a DCC signal. And a flag insertion unit for inserting a flag when a signal is output from the dual port buffer. 7. The multiplexing and demultiplexing apparatus of a data communication channel in a synchronous optical subscriber network transmission system, comprising: a dual port buffer; delete The synchronous optical subscriber network transmission system according to claim 1, wherein the control unit further comprises a processor having an oscillator for supplying a clock to the frame alignment unit and a communication port connected to the frame alignment unit. Multiplexing and demultiplexing apparatus for data communication channel in. The processor of claim 1, wherein the frame alignment unit generates frame pulses and clocks for all the unit slots and the TDM interface of the processor, and arranges a predetermined data communication channel input and output in the backplane. And an apparatus for multiplexing and demultiplexing a data communication channel in a synchronous optical subscriber network transmission system, comprising: performing a mutual interface with a network. In an optical subscriber network transmission system, a first step of extracting a time slot corresponding to a slot of a corresponding unit from a data communication channel using a frame pulse signal, a clock, and a slot ID, and after the first step, a flag and an idle in the HDLC format data And removing the pattern and storing the normal data in the dual port buffer. 2. The method of multiplexing and demultiplexing a data communication channel in a synchronous optical subscriber network transmission system. 10. The method of claim 9, wherein in the second step, when data exists in a transmission buffer, a timing is output to a data communication channel clock that matches a synchronous clock of a unit using an STM-1 or STM-4 scheme, and a flag is inserted. And a third step. The method of multiplexing and demultiplexing a data communication channel in a synchronous optical subscriber network transmission system. In the optical subscriber network transmission system, when the data is received, an eleventh step of removing a flag and an idle pattern from the received data and a twelfth step of storing normal data in the dual port buffer after the eleventh step A multiplexing and demultiplexing method of a data communication channel in a synchronous optical subscriber network transmission system. 12. The method of claim 11, wherein the twelfth step further comprises a thirteenth step of outputting a clock of a backplane and inserting a flag.

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