KR0171763B1 - Order line route method using fi byte in a synchronous transmission apparatus - Google Patents

Abstract

The present invention relates to a method for constructing a short circuit using a F1 byte in a synchronous optical transmission device, comprising: initializing (200) the optical transmission devices connected to the network; Receiving 210 the F1 byte belonging to the interval overhead of the synchronous multiplexed frame from the counterpart station; Determining whether the other line matching unit is operated as a main station or a sub-counter (220); Performing a predetermined matching line matching part manager routine when the determination is performed as a master station (230); And a step 240 of performing a predetermined mismatch line matching part agent routine when operating as a rich country, to prevent howling from occurring on the operator's communication line and to connect a blocked line when an abnormality occurs in the line. This can prevent the call from being disconnected.

Description

Other Short Circuit Path Configuration Method Using F1 Byte in Synchronous Transmission Device

1 shows a general synchronous multiplexing structure.

2 is an STM-n frame format of a general synchronous digital hierarchy.

(A) of FIG. 3 shows the section overhead (SOH) of the frame format shown in FIG.

(B) of FIG. 3 shows the path overhead (POH) of the frame format shown in FIG.

4 is an example of a ring photology of an optical synchronous transmission apparatus to which the present invention is applied.

5 is an example of a synchronous transmission apparatus to which the present invention is applied.

6 is an overall flowchart illustrating a method of using an F1 byte according to the present invention.

7 is a detailed flowchart of the F1 byte receiving step shown in FIG.

8 is a detailed flowchart of the matching line matching part manager routine performing step shown in FIG.

FIG. 9 is a detailed flowchart of the matching line matching agent agent routine performing step shown in FIG.

* Explanation of symbols for main parts of the drawings

10,20,30,40: Node S: Service Line

P: Reserve Line T: Optical Transmitter

R: Optical receiver 11,21,31,41: Multiplexing device

111: low speed multiplexer switching unit 112: low speed multiplexer

113: high speed multiplexer 114: network node matcher

115: clock supply 116: multiplexing control unit

117: system control unit 118: network control unit

119: mashing line matching unit 120: mashing board

121: Alarm

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronous optical transmission device. In particular, up to 84 or 2.048 Mbps signals (hereinafter referred to as DS1E), which are conventional asynchronous signals, are referred to as a maximum of 84 or 2.048 Mbps signals (hereinafter referred to as DS1E), and 44.736 Mbps signals (hereinafter referred to as DS3). SOH (Section Over Head) in the optical transmission device that accepts up to three signals and multiplexes them with the synchronous transmission module (STM) -1 signal, which is the basic in the synchronous digital network, and performs optical transmission. It relates to a method for constructing a haptic path using the F1 byte of).

In general, a synchronous optical transmission device converts an asynchronous multiplexed signal (for example, DS1, DS1E) into an optical signal in an optical transmitter, transmits the optical signal to an opposite station through an optical cable, and transmits the optical signal received from the other station to an optical receiver. After converting the signal to a synchronous demultiplexing to output an asynchronous demultiplexed signal, a process of forming a STM-n frame by synchronous multiplexing the asynchronous multiplexed signal is illustrated in FIG. 1. In FIG. 1, AM denotes an asynchronous multiplexing process, SM denotes a synchronous multiplexing process, and multiplexes in the direction of the arrow to form an STM-n frame. For example, a DS-1 frame is mapped to a box (C: Container) to be C-11, and when a path overhead (POH: Path OverHead) is added thereto, it is a virtual container VC-11. When the pointer PTR is added, it becomes a tributary unit (TU) TU-11. In addition, the TU-11 is grouped into four groups and multiplexed into VC-3 and VC-4 in the form of a hierarchical signal unit group (TUG-2), and three VC-3s are managed through an administrative unit (AU) AU-3. It is multiplexed to become a management unit group (AUG), and SOH is added to it and finally STM-1. At this time, the European DS1E is mapped to C-12, and then a path overhead (POH) is added to form 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 a connection between path layers in synchronous transmission, and the level signal unit TU is a lower path layer VC-1, VC-2 and an upper path layer VC-. Pointer is used to adapt 3, VC-4), and the hierarchy signal unit group (TUG) combines one or more hierarchy unit signals (TU) and aligns them at a predetermined position in the upper VC payload space. The management unit (AU) is used as an AU pointer as a signal unit to provide the adaptive function between the upper path layer and the multiplexer section layer, and the management unit group (AUG) combines one or more signals of the management unit (AU) to pay STM. It is aligned at a fixed position in space.

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

(A) of FIG. 3 is a section overhead (SOH) of the frame format shown in FIG. 2, with rows 1 to 3 being the player section overhead, row 4 to the AU pointer, row 5 to 9 the multiplexer section. Is overhead. In (a) of FIG. 3, the player section overhead is the section overhead (SOH) checked for each player, and 'A1' and 'A2' are frame alignment codes for identifying the boundary of the STM frame, where 'A1' = 11110110, 'A2' = 00101000, 'B1' is Bit Interleaved Parity (BIP) byte for player interval error monitoring, and 'D1, D2, D3' can be used in player interval. As a data communication channel (DCC), 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 (MSOH) is a section overhead identified for each multiplexer and is transparently passed in the players, and is composed of B2, D4 to D12, E2, K1, K2, Z1, and Z2. 'B2' is the bit-changing even-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 short circuit that can be used for voice communication in the multiplexer section, and 'K1, K2' are assigned for APS as APS (Automatic Protection Switching) channels, and 'K2' is an alarm display signal ( It is used for displaying 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. 3 (b) is a high path overhead (POH) of the frame format shown in FIG. Path overhead attached to the high-level virtual box, VC-3 and VC-4, located in the first column of VC-3 or VC-4, consisting of J1, B3, C2, G1, F2, H4, 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 lower path overhead is a path overhead (POH) attached to the lower virtual box, VC-1, VC-2, and is denoted as 'V5' as the first byte of VC-11, VC-12, and VC-2. It consists of BIP-2, FEBE, PT, L1-L3, and FERF.

The general description of such a synchronous transmission method is described in detail in pages 101 to 234 of the book Broadband Information Communication, co-authored by Lee Byung-ki and two others.

However, the synchronous optical transmission device using the synchronous transmission method can be used as a single station (TER) type and a branch / coupled (ADM) type. The E1 channel is configured as a closed loop, which causes a howling phenomenon. In order to solve this problem, the master station blocks one path to prevent howling. In this case, it is preferable to block the other station by determining whether it is in the path.

Accordingly, an object of the present invention is to provide a method for constructing a short circuit path using F1 bytes inserted in a repeater section overhead (SOH) of a synchronous transmission format.

In order to achieve the above object, the present invention, in a network in which the optical transmission device having a synchronous multiplexing function to form a double line in a ring-shaped operation in a branch / combined type, the steps of the optical transmission device connected to the network; Receiving F1 bytes from the counterpart station belonging to the interval overhead of the synchronous multiplexed frame; Determining whether its own matching line is operated as a master station; Performing a predetermined matching line matching unit manager routine when the determination is performed as a master station; And performing a predetermined matching line matching part agent routine when the terminal is operated as a result of the determination.

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

First, an example of configuring a ring network having four nodes using a synchronous optical transmission apparatus to which the present invention is applied is as shown in FIG. 4, as shown in FIG. It consists of the station D (40), and each station is provided with two optical transmitters and multiplexers / demultiplexers and a ring is formed by two lines. In FIG. 2, S denotes a service line currently in use, P denotes a reserve line, and a signal transmission direction is in the opposite direction to the service line.

That is, the station A 10 multiplexes its own station signal with the relay signal received from the station D 40 through the receiver 13 or from the station B 20 through the receiver 14, and then the transmitter 12. Converts the optical signal to the station B 20 through the service line S, and converts the optical signal from the transmitter 15 to the station D 40 through the preliminary line P, respectively. 20) multiplexes the relay signal received from the station A 10 through the receiver 23 or the station signal received from the station C 30 through the receiver 24 and its own station signal, and then converts the transmitter 22 into an optical signal. By converting the optical signal from the transmitter 25 to the station C through the service line (S), and transmits to the station A (10) via the preliminary line (P), respectively. The signal transmission in the station C and the D is the same as the signal transmission in the A and B stations.

In this ring structure, each node is composed of one master station and the other slave stations, and all nodes can be equally master stations, and the master stations receive and reserve service lines (S). (P) The sending side should be cut off (called S-cut) or service line (S) transmission, and the reserve line (P) receiving side should be cut off (called P-cut). Both transmission and reception of line P must be connected.

As shown in FIG. 5, a synchronous multiplexer to which the present invention is applied (hereinafter, since multiplexing of a transmission process in the present invention includes demultiplexing in a reception process, multiplexing and demultiplexing are simply referred to as multiplexing). Low Speed Multiplexer Switching Unit (LPSB: 111), Low Speed Multiplexer (LSMB: 112), High Speed Multiplexer (HSMB: 113), Network Node Matcher (NNIB: 114), Clock Supplyer (STGB: 115), Multiplexing Control Unit ( CPCB: 116, System Control Unit (SPCB: 117), Network Control Unit (DCCB: 118), Matching Line Matching Unit (OWIB: 119), Matching Board (TEL: 120), Alarm (ALU: 121). The signal DS1 or DS1E is converted and inversely converted into the STM-1 signal which is a synchronous multiplexed signal.

In FIG. 5, a clock supplier (STGB) 115 generates and supplies a clock and timing necessary for a system, and a system controller (SPCB) 117 is in charge of controlling and monitoring the entire system, and a network controller (DCCB: 118) accesses the OAM data by the TMN protocol to the parameters of the large or remote station and provides communication over the DCC channel. The low speed multiplexer (LSMB: 112) consists of six operation boards and one spare board, so that the synchronous multiplexing / demultiplexing of the DS1 signal to the TUG2 signal is connected, and the high speed multiplexer (HSMB: 113) connects up to 21 TUG signals. Synchronous synchronization / demultiplexing with VC-3 and AUG signals. In addition, the low speed multiplexer switching unit (LPSB) 111 is composed of relays for switching a 7: 1 circuit and a 6: 1 board (or unit) to improve the availability and reliability of a service channel. The switch is performed according to the transfer command of: 116, and the network node matching device (NNIB: 114) connects the AUG signal to generate and insert a section overhead (SOH) to form an STM-1 signal to connect to the optical device and restore the clock. It also performs a scramble function to make it smooth. And the other line matching unit (OWIB: 119) performs the function of connecting the other line to the network through the system control unit 117, two-wire interface function, multi-party call configuration function, call setup internal function, E1 / E2 selection Function and the like, and the alarm 121 processes the alarm according to the control of the system control unit 117. On the other hand, the system control unit 117 and the network control unit 118 is connected to the terminal equipped with a graphical user matching (GUI) function, the matching line matching unit 129 is connected to the matching board (TEL), network node matching device 114 transmits and receives the STM-1 signal to the service line and the reserve line, respectively.

Next, the present invention will be described based on an understanding of the optical transmission device as described above and the branch / coupled ring structure constructed using the same.

6 is a flowchart illustrating a method of using an F1 byte according to the present invention, comprising: a system initialization step 200, an F1 byte reception step 210, and determining whether the master station is a main line matching part 220; If it is determined that the host is the master station, performing a matching line matching unit manager routine (230); As a result of the determination, if it is a rich station, a matching 240 matching agent agent routine is performed, and after receiving the F1 byte, it performs the corresponding routine according to whether it is the main station or the rich station of the matching line matching unit.

FIG. 7 is a detailed flowchart of the F1 byte receiving step shown in FIG. 6, comprising: determining whether the F1 byte received from the network node matching unit NNB1 connected to the service line is 0xFF (301); If the result of the determination is 0xFF, replacing the network node matching unit NNB1 received F1 byte with 0x00 (302); Determining whether the F1 byte received from the network node matching unit NNB2 connected to the reserve line is 0xFF (303); If it is determined that 0xFF, the network node matching unit NNIB2 receives the received F1 byte into 0x00 (304); And determining whether the TEL state is abnormal in the received F1 byte of NNIB1 or NNIB2, and if the TEL state is abnormal, return to the abnormal routine and return to normal routine if normal. .

As described above, in the embodiment of the present invention, the F1 byte is defined and used for each bit as shown in Table 1 below.

As shown in Table 1, the F1 byte of the interval overhead (SOH) is used for bits 4 and 5 for remote loopback, and bit 3 is used to indicate the state (absence) of the batting board (TEL). Bit 0 is used for local loopback. For example, if bit 3 is 0, the sum is normal, and if 1, it is abnormal.

FIG. 8 is a detailed flowchart of the matching line manager routine execution step shown in FIG. 6, comprising: determining whether a remote loopback is displayed in the received F1 byte (401); Determining (402) whether the local station has performed a loopback; Determining whether the TEL state of the received F1 byte is marked abnormally (403); If it is determined that the TEL state is abnormal, converting the cut through mode to the THROUGH mode (404); Determining whether it is possible to receive E1 bytes from the network node matching unit NNIB1 connected to the service line (405); If it is determined that E1 byte reception is not possible, converting the cut through mode to the service line receiving cut mode (406); Determining whether it is possible to receive E1 bytes from the network node matching unit NNIB2 connected to the preliminary line (407); If it is determined that E1 byte reception is not possible, converting the cut through mode to the reserve line receiving cut mode (408); Converting the cut-through mode to the service-receiving cut mode when the reception from the service line and the spare line is normal (409); Determining whether the local loopback or the remote loopback is set in the received F1 byte (410); If the loopback is set, displaying the TEL state abnormally in the transmission F1 byte (411); If it is not set, displaying the TEL state as normal in the transmission F1 byte (412); Setting a matching line matching part control register (413); And setting the network node matching unit control register 414.

That is, the manager routine performed by the master according to the present invention checks the received F1 byte and informs the counter station if it is in the remote loopback or local loopback state, and if the TEL state of the received F1 byte is abnormal, converts the cut-through mode to the through mode. Connect blocked lines (401, 402, 403, 404). If an error occurs in the service line and the E1 byte is not received from the service line, the cut-through mode is converted to the service line receiving cut mode to block the service line receiving side (405,406). If an error occurs in the reserve line and does not receive the E1 byte from the reserve line, the cut-through mode is converted to the reserve line receive cut mode to block the reserve line receiver (407, 408). If both the service line and the spare line are normal, the cut-through mode is converted to the service line receiving cut mode to block the service line receiving side (409).

FIG. 9 is a detailed flowchart of the matching line matching agent agent routine performing step shown in FIG. 6, which determines whether the remote loopback is indicated in the received F1 byte (501); Determining (502) whether the self has performed its own loopback; Determining whether the TEL state of the received F1 byte is marked abnormally (503); If it is determined that the TEL state is abnormal, converting the cut-through mode to the THROUGH mode (504); Determining whether it is possible to receive E1 bytes from the network node matching unit NNIB1 connected to the service line (505); If it is determined that E1 byte reception is not possible, converting the cut through mode to the service line receiving cut mode (506); Determining whether it is possible to receive E1 bytes from the network node matching unit NNIB2 connected to the preliminary line (507); If it is determined that E1 byte reception is not possible, converting the cut through mode to the reserve line receiving cut mode (508); Converting the cut through mode to the through mode when the service line and the spare line are all normal (509); Judging whether the other wire matching mode (Owib) control mode is the through mode (510); Copying the TEL state of the transmit F1 byte to the TEL state of the received F1 byte in the through mode; If it is not in the through mode, displaying a TEL state abnormally in the transmitted F1 byte (512); Setting 513 an utterance matching unit (Owib) control register; And setting 514 a network node matching unit (NNIB) control register.

In other words, the agent routine performed by the sub-station according to the present invention checks the received F1 byte and notifies the counter station if the remote loopback or local loopback state and converts the cut-through mode to the through mode if the TEL state of the received F1 byte is abnormal. Connect the blocked lines (501, 502, 503, 504). If an error occurs in the service line and the E1 byte is not received from the service line, the cut-through mode is converted to the service line receiving cut mode to block the service line receiving side (505,506). If an error occurs in the reserve line and does not receive the E1 byte from the reserve line, the cut-through mode is converted to the reserve line receive cut mode (Protect Rx Cut Mode) to cut off the reserve line receiver (507,508). If both the service line and the reserve line are normal, the cut through mode is converted to the through mode to connect both the service line and the reserve line (509).

As described above, according to the present invention, the ring line is connected or blocked according to the state of the F1 byte and the service line and the reserve line, thereby preventing the closed loop from being formed in the normal state, thereby preventing the howling phenomenon from occurring in the operator's call line. And if an abnormality occurs in the line, it is possible to prevent the disconnection of the call by connecting the blocked line.

Claims (4)

In a network in which optical transmission apparatuses having a synchronous multiplexing function form a double line in a ring shape and then operate in a branch / combination type, initializing the optical transmission apparatuses connected to the network (200); Receiving 210 the F1 byte belonging to the interval overhead of the synchronous multiplexed frame from the counterpart station; Determining whether the other line matching unit is operated as a main station or a sub-counter (220); Performing a predetermined matching line matching part manager routine when the determination is performed as a master station (230); And (240) performing a predetermined matching line matching part agent routine when operated as a sub-station as a result of the determination. The method of claim 1, wherein the receiving of the F1 byte (210) comprises: determining (301) whether the F1 byte received from the network node matching unit (NNB1) connected to the service line is 0xFF; If the result of the determination is 0xFF, replacing the network node matching unit NNB1 received F1 byte with 0x00 (302); Determining whether the F1 byte received from the network node matching unit NNB2 connected to the reserve line is 0xFF (303); If it is determined that 0xFF, the network node matching unit NNIB2 receives the received F1 byte into 0x00 (304); And determining (305) whether the TEL state is displayed abnormally in the received F1 byte of NNIB1 or NNIB2. The method of claim 1, wherein the matching line manager routine execution step (230) comprises: determining whether the remote loopback is displayed in the received F1 byte (401); Determining (402) whether the local station has performed a loopback; Determining whether the TEL state of the received F1 byte is marked abnormally (403); If it is determined that the TEL state is abnormal, converting the cut through mode to the THROUGH mode (404); Determining whether it is possible to receive E1 bytes from the network node matching unit NNIB1 connected to the service line (405); If it is determined that E1 byte reception is not possible, converting the cut through mode to the service line receiving cut mode (406); Determining whether it is possible to receive E1 bytes from the network node matching unit NNIB2 connected to the preliminary line (407); If it is determined that E1 byte reception is not possible, converting the cut through mode to the reserve line receiving cut mode (408); Converting the cut-through mode to the service-receiving cut mode when the reception from the service line and the spare line is normal (409); Determining whether the local loopback or the remote loopback is set in the received F1 byte (410); If the loopback is set, displaying the TEL state abnormally in the transmission F1 byte (411); If it is not set, displaying the TEL state as normal in the transmission F1 byte (412); Setting a matching line matching part control register (413); And setting a network node matching unit control register (414). A method for forming a short circuit using a F1 byte in a synchronous transmission device. The method of claim 1, wherein the matching line matching agent agent performing step (240) comprises: determining whether a remote loopback is indicated in the received F1 byte (501); Determining (502) whether the self has performed its own loopback; Determining whether the TEL state of the received F1 byte is marked abnormally (503); If it is determined that the TEL state is abnormal, converting the cut-through mode to the THROUGH mode (504); Determining whether it is possible to receive E1 bytes from the network node matching unit NNIB1 connected to the service line (505); If it is determined that E1 byte reception is not possible, converting the cut through mode to the service line receiving cut mode (506); Determining whether it is possible to receive E1 bytes from the network node matching unit NNIB2 connected to the preliminary line (507); If it is determined that E1 byte reception is not possible, converting the cut through mode to the reserve line receiving cut mode (508); Converting the cut through mode to the through mode when the service line and the spare line are all normal (509); Judging whether the other wire matching mode (Owib) control mode is the through mode (510); Copying the TEL state of the transmit F1 byte to the TEL state of the received F1 byte in the through mode; If it is not in the through mode, displaying a TEL state abnormally in the transmitted F1 byte (512); Setting 513 an utterance matching unit (Owib) control register; And setting a network node matching unit (NNIB) control register (514).