KR100237475B1 - An apparatus for requesting to switch a remote aumux unit in synchronous transmission system - Google Patents

Abstract

The present invention relates to an apparatus for requesting switching of a power high-speed multiplexing unit using H4 bytes in path overhead in a synchronous digital transmission system.

The present invention is the MCU command generation unit 55 for generating a request for switching the power unit when receiving the transfer command of the power unit from the operator; H4 byte clock generation means 54 for generating an H4 byte clock; H4 bit clock generating means (53) for receiving the H4 byte clock and generating an H4 bit clock for designating the msb bit position of the H4 byte when the power unit switching signal is received; An H4 byte insertion unit 52 for forming an H4 byte by setting an msb bit to a predetermined logical value according to the H4 bit clock; And an overhead insertion unit 51 for inserting the H4 byte into main data according to the H4 byte clock.

Therefore, the power unit switching request apparatus according to the present invention can request the power unit switching without the TMN board, there is an effect that the maintenance is easy in an emergency.

Description

An apparatus for requesting to switch a remote AUMUX unit in synchronous transmission system

The present invention relates to an apparatus for requesting switching of a power unit in a synchronous digital transmission system, and more particularly, to an apparatus for requesting switching of a power high speed multiplexing unit using H4 bytes in a path overhead.

In general, a synchronous digital transmitter converts an asynchronous multiplexed signal (for example, DS1, DS1E) into an optical signal in an optical transmitter, and then transmits the optical signal to an opposite station through an optical cable, and transmits the optical signal received from the other station in the optical receiver. After converting the signal into a synchronous signal, asynchronous demultiplexed signal is output.

As described above, a process of forming an STM-n frame by synchronously multiplexing an asynchronous multiplex signal is shown in FIG. 1. In FIG. 1, "AM" represents an asynchronous multiplexing process, "SM" represents a synchronous multiplexing process, and is multiplexed in an arrow direction to form an STM-n frame. That is, the DS-1 frame is mapped to the box (C: Container) to become "C-11", and when a path overhead (POH: Path OverHead) is added thereto, it becomes a virtual box (VC) "VC-11". When the pointer PTR is added thereto, the level signal unit TU is " TU-11 ". In addition, "TU-11" is grouped into four groups and multiplexed into "VC-3" and "VC-4" in the form of a hierarchy signal unit group (TUG-2), and "VC-3" is a management unit (AU) "AU". The three are multiplexed through -3 "to form a management unit group (AUG), and finally STM-1. At this time, the European DS1E is mapped to "C-12" and the path overhead (POH) is added to become the virtual box "VC-12".

Here, the box (C) is a basic unit constituting the synchronous multiplexing structure, and the existing asynchronous digital hierarchical signals are synchronously multiplexed by being mapped into the corresponding box, and correspond to C-1, C-2, C-3, There is C-4, and C-1 is again divided into C-11 to map North American DS1 and C-12 to map European DS1E. The virtual box VC is a signal unit for supporting connection between path layers in synchronous transmission, and the hierarchy signal unit TU is a lower path layer VC-1, VC-2 and a higher path layer VC-. Pointer is used to adapt between 3 and VC-4), and the hierarchy signal unit group (TUG) combines one or more hierarchy unit signals (TU) and aligns them in a predetermined position in the upper VC payload space. The unit (AU) is an AU pointer as a signal unit for providing an adaptation function between the upper path layer and the multiplexer section layer. The management unit group (AUG) combines one or more management unit (AU) signals in the STM pay space. It means that it is aligned at a fixed position.

Figure 2 shows the STM-1 frame format of a general synchronous digital hierarchy, which occupies 9 rows and 270 columns of bytes for 125 microseconds, and thus has a transmission rate of 9 x 270 x 8 x 8 Kbps = 155.550 Mbps. Here, 9x9 bytes are segment overhead (SOH) and AU pointer spaces, and 9x261 bytes are payload spaces. In the 9x9 byte, 3x9 (a) is the player section overhead, 1x9 (b) is the AU pointer, and 5x9 (c) is the multiplexer section overhead. The payload space may be loaded with one VC-4 or three VC-3s. The VC-3 includes a 9 × 1 path overhead (d: POH).

FIG. 3A is a section overhead (SOH) of the frame format shown in FIG. 2, with rows 1 to 3 being player section overheads, row 4 to AU pointers, and row 5 to 9 multiplexer sectioning over. Head. In FIG. 3A, player section overhead is section overhead checked for each player, and 'A1' and 'A2' are frame alignment codes for identifying the boundary of the STM frame, and 'A1' = 11110110, ' A2 '= 00101000,' B1 'is the bit interleaved parity (BIP) byte for player interval error monitoring, and' D1, D2, D3 'is the data communication channel that can be used in the player interval. (DCC: Data Communication Channel), the capacity of each channel is 64 Kbps, so the total capacity of the player section data communication channel is 192 Kbps. 'E1' is an orderwire that can be used for voice communication in the player section, 'F1' is a user channel for users such as network operators, and 'X' is assigned to be defined and used in each country. Space.

The multiplexer section overhead is a section overhead identified for each multiplexer and is transparently passed to the players. The multiplexer section overhead includes B2, D4 to D12, E2, K1, K2, Z1, and Z2. 'B2' is the bit even-number check byte for the error detection function of the multiplexing section, and 'D4 to D12' is the data communication channel (DCC) for the multiplexer section, and the total capacity is 576 Kbps. 'E2' is a line that can be used for voice communication in the multiplexer section, and 'K1, K2' are assigned for APS as Automatic Protection Switching (APS) channels, and 'K2' is an alarm display signal ( It is used for displaying the interval maintenance signal such as AIS (Alarm Indication Signal) and FERF, and 'Z1 and Z2' are reserved bytes for future use.

The path overhead (POH) has a high path overhead and a low path overhead. FIG. 3B shows a high path overhead (POH) of the frame format shown in FIG. 2, and the high path overhead is high. The virtual box, that is, the path overhead attached to VC-3 and VC-4, is located in the first column of VC-3 or VC-4, and consists of J1, B3, C2, G1, F2, H4, and Z3 to Z5. 'B3' is the bit shift even check byte for path error monitoring function, 'C2' is the signal label to indicate the configuration of VC-3 / VC-4, and 'F2' is for communication between path devices. 'G1' is a channel for informing the VC-3 / VC-4 sender of the path status and performance at the VC-3 / VC-4 receiver, and 'H4' is used for multi-frame display of component payloads. Used. The low path overhead is a path overhead (POH) attached to the low virtual box, VC-1, VC-2, and is indicated as 'V5' as the first byte of VC-11, VC-12, VC-2, and BIP. -2, FEBE, PT, L1-L3, and FERF.

Such a synchronous transmission device is designed to improve reliability by continually providing services by switching major units to active / standby forms and switching to another unit performing the same function when one unit fails. That is, the low speed multiplexing unit is provided with a spare unit to provide a switching function in a 7: 1 manner, and the high speed multiplexing unit provides a switching function in a 1: 1 manner.

However, for maintenance, this transfer function must be performed not only for the own station unit but also for the power station unit. In the past, the transfer unit of the power station cannot be changed without the TMN unit because the transfer of the power unit is required using the TMN function. There is this.

Accordingly, an object of the present invention has been proposed to solve the above problems, and the apparatus for requesting switching of a power unit for switching a high speed multiplexing unit of a power using H4 bytes included in a path overhead without a TMN unit in a synchronous transmission system. The purpose is to provide.

In order to achieve the above object, the apparatus of the present invention has a transmission system of a local station and a large station in which a plurality of low speed multiplexing units and at least one preliminary low speed multiplexing unit, a high speed multiplexing unit and a preliminary high speed multiplexing unit, and a main control unit (MCU) are provided. A synchronous transmission system capable of requesting unit switching to a transmission system of a power station, each comprising: an MCU command generation unit generating a power unit switching request signal when an operator receives a transfer command of the power unit; H4 byte clock generating means for generating an H4 byte clock; H4 bit clock generating means for receiving the H4 byte clock and generating an H4 bit clock for designating the msb bit position of H4 byte when the power unit switching signal is received; An H4 byte inserter configured to form an H4 byte by setting an msb bit to a predetermined logical value according to the H4 bit clock; And an overhead insertion unit for inserting the H4 byte into main data according to the H4 byte clock.

1 is a diagram illustrating a general synchronous multiplexing structure;

2 illustrates an STM frame format of a general synchronous digital hierarchy;

FIG. 3 is a diagram illustrating formats of interval overhead and path overhead of FIG. 2;

4 is a block diagram showing a schematic configuration of a transmission apparatus suitable for applying the present invention;

5 is a block diagram showing an apparatus for requesting the transfer of AUMUX to the player side using H4 bytes according to the present invention;

FIG. 6 is a timing diagram for describing the apparatus shown in FIG. 5.

* Explanation of symbols for main parts of the drawings

110: multiplexing / demultiplexing unit 120: timeslot switching unit

130: optical transmission and reception unit 140: system control unit

111, 112: switching part 113, 114, 115: low speed multiplexing unit

116, 117: high speed multiplexing unit 141: main control unit (MCU)

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, referring to an example of a synchronous optical transmission apparatus suitable for the present invention, as shown in FIG. 4, the multiplexing / demultiplexing unit 110, the timeslot switching unit 120, the optical transmission / reception unit 130, and a system are shown. The multiplexer / demultiplexer 110 includes a low speed multiplexer transmission switching unit 111, a low speed multiplexer reception switching unit 112, a low speed multiplexing unit 113, and a low speed multiplexing preliminary unit ( 114, 115, a high speed multiplexing unit 116, and a high speed multiplexing preliminary unit 117.

The timeslot exchanger 120 and the optical transmitter / receiver 130 are also configured as an active unit and a standby unit for 1: 1 switching, and the system controller 140 includes a main control unit (MCU) 141 and a digital communication unit. (DCU: 142).

In Fig. 4, the low-speed multiplexing units DS1 and DS1E are composed of seven operating units 113, one spare unit (DS1N: 114) and one spare unit (DS1E: 115) to convert the DS1 signal into a TUG2 signal. In synchronous multiplexing / demultiplexing, the high-speed multiplexing units 116 and 117 connect up to 21 TUG signals and perform synchronous multiplexing / demultiplexing with VC-3 and AUG signals.

In addition, the low-speed multiplexer switching unit (111, 112) is composed of relays for circuit switching and unit switching in order to improve the availability and reliability of the service channel, and transfers the unit according to the local transfer command of the multiplexing controller and MCU not shown. The high speed multiplexing units 116 and 117 connect the AUG signal to generate and insert a section overhead (SOH) to form the STM-1 signal.

In such a transmission device, data is transmitted / received in a serial manner when data is transmitted and received between units, for example, DS1 / E-> TUG-> AU-> STM-1, and the low speed multiplexing unit 113 and the high speed multiplexing unit At 116, there is a function of inserting overhead.

FIG. 5 is a block diagram showing an apparatus for requesting switching of AUMUX to the player side using H4 bytes according to the present invention, and FIG. 6 is a timing diagram for explaining the apparatus shown in FIG.

First, in the present invention, the TMN is not used to request the switching of the high speed multiplexing unit in the large power station, but the H4 byte included in the high path overhead is used. H4 bytes are used for multi-frame indication of the component payload, which is essentially used for fixed TUs but is optionally used for floating TUs. The 8 bits of H4 are called P1, P0, SI ₂ , SI ₁ , CI ₃ , CI ₂ , CI ₁ , T, where P (P1, P0) is the ternary strength, SI is the ternary strength, and C is 8 True strength, T is used for binary strength respectively. In the embodiment of the present invention, when the H4 byte is not used for the strength, the switching of the high speed multiplexing unit (AUMUX) is requested to the counter side by using the 'msb' of the H4 byte.

Referring to Fig. 5, the power unit switching request apparatus of the present invention includes a main data processing unit 50, an overhead insertion unit 51, an H4 byte insertion unit 52, an H4 msb insertion clock generation unit 53, and H4. The clock generator 54 and the MCU command generator 55 are configured. The main data processor 50 combines the multiplexed data on the low-speed multiplexing side in TU units to form an AU32 payload, and the overhead inserter 51 inserts a high path overhead into the AU32 data. In the embodiment of the present invention, H4 bytes are inserted into AU32 data according to the H4 clock.

The H4 byte inserter 52 inserts 1 into the msb bit of H4 byte according to the clock of the H4 msb insert clock generator 53 to form H4 bytes, and the H4 msb insert clock generator 53 inserts H4 msb. The clock is busy. The H4 clock generator 54 generates the H4 clock, and the MCU command generator 55 outputs "1" when the transfer command is input from the operator to make msb of the H4 clock 1 and transmit it to the counterpart.

In this way, when a large speed multiplexing unit transfer command is input from the operator, the MCU command generation unit 55 transfers the transfer command to 1 to the H4 msb insertion clock generation unit 53, and the H4 msb insertion clock generation unit 53 Generates a bit clock to find the H4 msb bit position from the H4 clock received from the H4 clock generator. The H4 byte inserter 52 forms the H4 byte by setting the H4 msb bit value to "1" according to the H4 msb bit clock, and the overhead inserter 51 outputs the H4 byte output by the H4 byte inserter 52. Is latched according to the H4 byte clock to output the AU3 data with the overhead inserted.

Referring to FIG. 6, the H4 byte position of the main data is designated by the H4 byte clock, and the msb bit position of the H4 byte is designated by the H4msb bit clock. When the transfer unit transfer command is input from the MCU, the MCU transfer request signal becomes high (1). Accordingly, 1 is inserted into the msb bit position of H4 bytes and transmitted to the station side.

As described above, the power unit switching request apparatus according to the present invention can request the power unit replacement without the TMN board, there is an effect that easy maintenance in an emergency.

Claims (1)

The local and foreign transmission systems may request unit switching to the transmission system of the large station, including a plurality of low speed multiplexing units, at least one preliminary low speed multiplexing unit, a high speed multiplexing unit and a preliminary high speed multiplexing unit, and a main control unit (MCU), respectively. In the synchronous transmission system An MCU command generating unit 55 for generating a switching unit request signal for receiving the switching unit of the power unit from an operator; H4 byte clock generation means 54 for generating an H4 byte clock; H4 bit clock generating means (53) for receiving the H4 byte clock and generating an H4 bit clock for designating the msb bit position of the H4 byte when the power unit switching signal is received; An H4 byte insertion unit 52 for forming an H4 byte by setting an msb bit to a predetermined logical value according to the H4 bit clock; And And an overhead insertion unit (51) for inserting the H4 byte into the main data in accordance with the H4 byte clock.

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