KR0169645B1 - Remote subscriber exchanger module link device of digital full electronic exchange system - Google Patents

Abstract

According to the present invention, a structure in which RASMs 240 to 1 to 240-n are connected through an ASS 220 includes a plurality of ASSs having a time slot exchange function, and an INS connected through an optical link, respectively, to function a space switch. In the digital electronic switching system to implement a, the RASM for connecting a remote subscriber is connected to the ASS so that the remote subscriber can be space-switched in the INS after the time slot exchange in the ASS. Therefore, the intercall blocking can be eliminated by connecting the RASM through the ASS with the timeslot switching function, and the timing problem required for the direct connection to the INS can be solved.

Description

Remote subscriber exchange module (RASM) connection device of digital electronic exchange

1 is a black diagram showing a structure of conventionally connecting a RASM.

2 is a block diagram showing a structure for connecting a RASM in accordance with the present invention.

* Explanation of symbols for main parts of the drawings

100, 210, 220: Access Switching Subsystem (ASS)

101, 111, 211, 221, 242: time switch unit (TSW)

102, 212, 222: Local data link division (LDL)

110, 240-1, 240-n: Remote subscriber exchange module (RASM)

112, 223, 241: relay line / local data link unit (TLDL)

120, 230: Interconnect Network Subsystem (INS)

121, 231: Central Data Link Division (CDL)

122, 232: space switch unit (SSW)

123: Highway Rate Conversion Unit (HRC)

124: trunk line / central data link (TCDL)

The present invention relates to a remote subscriber access technology for connecting a small remote subscriber to a large exchange main body in a digital electronic switching system.

In general, digital switchboards (eg, TDX-10 models) are connected to 8K subscribers and PCMized and multiplexed, and the multiplexed subscribers are aggregated at a predetermined aggregation rate to exchange time slots. Access switching subsystem (ASS), which is connected to the interconnection network subsystem (INS) via a link, and interconnection network subsystem (INS), which performs space-by-way switching of subscribers and relay lines connected via optical or PCM links. ): Remote subscriber exchange module which consists of central control subsystem (CCS) that monitors and controls the exchange system and performs the exchange function located in the same country, and accommodates small remote subscribers far from the country. (RASM) can be connected to the INS via a PCM link.

That is, in a digital exchange, a conventional connection structure for connecting a remotely located RASM to a large-capacity exchange body is shown in FIG. 1, where the relay line / local data link (TLDL: 112) of the RASM 110 is shown. The unit is connected to the relay line / center data link (TLDL: 124) unit via the 1K PCM link, and is then connected to the space switch unit 122 by converting the rate through the highway rate conversion unit (HRC) 123.

In FIG. 1, the ASS 100 receives PCM data in units of 32 sub-highways from an ASI unit (not shown) that accepts subscribers, multiplexes and demultiplexes, and exchanges time slots according to a predetermined condensing ratio. Time switch unit (TSW) 101 for inputting / outputting data of 10 Mbps (8-bit PCM data, 1 bit parity, 1 bit valid bit), and 1K received from the time switch unit 101. After adding frame allocation word (FAW) and data for IPC to PCM data, converting CMI to optical signal, converting optical signal received from optical link to electrical signal, and then re-rambling PCM data to time switch A local data link (LDL) 102 for outputting to the unit 101 is provided.

In addition, a remote subscriber exchange module (RASM: 110) for connecting a small group of remote subscribers to a large-capacity switch body has a time switch unit (TSW: 111) for connecting a remote subscriber and exchanging timeslots; A relay line / local data link (TCDL) 112 portion is provided for connecting 111 to the INS 120 via a PCM link.

The interconnection network subsystem (INS: 120) is connected point-to-point via multiple ASSs and optical links, respectively, to form a communication path between the INS and ASS, and 8.192Mbps with the space switch block (SSW: 122). Centrally linked to data streams and linked to CI blocks (not shown) with 1,024xn (n = 1, 2, 4, 8) Mbps bit streams, and NES blocks (not shown) with 65.520 MHz synthetic pulses. Data link unit (CDL: 121): Space switch unit for space switching 64x64 highway (SSW: 122): Relay line / Central data link unit (TCDL) linking the remote subscriber exchange module 110 and PCM link: A highway rate converter (HRC) 123 for converting the rates is provided.

Here, the HRC 123 converts the high-speed data (8.192 Mbps parallel 10 bits) into serial and converts it to a 3248 subhighway by converting it to a transmission rate of 2.048 Mbps or vice versa. To HW rate data (8.192Mbps parallel 10bit).

As described above, in the conventional digital electron exchanger (Yeken University, TDX-10 series), the RASM 110 is linked with the exchanger body through the HRC block at the INS. Typically, the HRC block and the RASM are linked by about 1K channel. However, the channel used by the subscriber accommodated on the RASM side has a smaller channel (eg, about 256 channels).

However, if the number of channels subscribed to the RASM is much less than 1K, the SSW block or HRC block does not have a timeslot exchange function. When a subscriber of any ASS attempts to speak with a subscriber of a RASM that accepts 256 channels, if the channels from 0 to 255 are already in use by other subscribers, that ASS will be associated with the RASM. There was a problem in which an inter-collar blocking phenomenon that fails to make a call occurs. This problem occurs more frequently with fewer RASM subscribers.

Therefore, in order to solve this problem, an improved digital electronic exchanger (e.g., an improved TDX-10) implements a copy function for transmitting and receiving the same data multiple times in accordance with the receiving channel of the RASM between the SSW block and the HRC block. Attempt to eliminate intercall blocking.

However, even in this modification, when there are several RASMs, in a call between RASMs and RASMs, for example, if one RASM1 accepts 512 channels and the other RASM2 accepts 128 channels, the RASM1 already has 0 to 127. If a channel is in use, any subscriber of RASM1 attempts to make a call with the subscriber of RASM2, causing an inter-call blocking phenomenon.

In the case of receiving a plurality of RASMs through the HRC block in the INS, the effective timing margin for data transmission is fixed when transmitting 8.192 Mbps PCM data in the SSW direction from the HRC block. As a result, the separation allowance distance between the HRC block and the SSW block is very limited, which causes problems when accommodating multiple RASMs. Therefore, the TDX-10 improved type can adjust the timing margin of the PCM data clock transmitted in the SSW block direction, so that the separation distance between the HRC block and the SSW block can be determined to accommodate multiple RASMs.

The reason why the inter-call blocking occurs in connecting the RASM is that the HRC block linking with the RASM does not have a timeslot switching function as described in FIG.

Accordingly, an object of the present invention is to provide a RASM access structure in which HRC is removed by connecting RASM to INS through ASS.

In order to achieve the above object, the apparatus of the present invention, in the digital electronic switch, in which a plurality of ASS having a time slot switching function, and each INS connected via an optical link to implement a space switch function,

The RASM for accessing the remote subscriber is connected to the ASS so that the remote subscriber can time switch in the INS after the time slot exchange in the ASS.

In other words, the present invention utilizes the Time Slot Interchange (TSI) function in the ASS by allowing the RASM to be connected through the ASS without directly connecting the INS. As described above, when accessing the RASM through the ASS, a time division switch exists so that the problem of the intercall blocking may be solved by changing the time slot to the channel for communicating the data entered through the arbitrary channel with the RASM.

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

FIG. 2 is a block diagram illustrating a structure in which RASMs 240-1 to 240-N are connected through ASS 220 according to the present invention. FIG. 20) are connected, and the RASMs 240-1 to 240-N are connected to the INS 230 via any ASS 220.

Here, ASS without RASM is inputted / outputted 8.192Mbps 10-bit data by inputting subhighway data collected from digital concentrator and multiplexing and demultiplexing and exchanging type slot according to predetermined condensing ratio. Positioning unit (TSW: 211) and: Add the frame allocation word (FAW) and data for the IPC to the 1K PCM data received from the time switch unit 211, CMI conversion to convert to an optical signal, from the optical link A local data link unit (LDL: 212) for converting the received optical signal into an electrical signal and outputting the PCM data to the time switch unit 211 after reframing is provided. Remote subscriber exchange module (RASM (240-1 ~ 240-N)) for connecting to the time switch unit (TSW: 241) for exchanging timeslots by connecting the remote subscriber: and the time switch unit to the INS via the PCM link A relay line / local data link unit (TLDL: 241) is provided for interconnection, and the interconnect network subsystem (INS: 230) is connected point-to-point via multiple ASSs and optical links, respectively, to establish a communication path between INSs and ASSs. A central data link unit (CDL: 231) and a space switch unit (SSW: 232) for space switching the highway are provided.

Here, in the ASS 220 connected to the RASM, the relay line / local data link unit 223 for connecting the RASM is connected to the time switch unit 221, and the relay line / local data link unit 223 is connected to the RASM. It is connected to the relay line / local data link unit 241.

In this case, since one ASS is connected to the INS and the 4K link, when one 1K link is used to access the RASM, up to eight RASMs may be accommodated in the 1K optical link according to the capacity of the receiving channel of the RASM. In addition, since the RASM is accommodated through the ASS, the problem of the distance limitation between the SSW and the HRC, which may occur when receiving a plurality of RASMs in the TDX-10 series, may be solved at the same time.

On the other hand, the reason why the conventional electronic exchanger (TDX-10 series) could not accommodate RASM is that the maximum receiving channel of one ASS is, for example, 1K link in TDX-10 voice and 2K link in TDX-10 retrofit type, so RASM increases. As such, ASS has also increased so much that the price of exchanges has increased. However, since the digital switchboard (TDX-100 switch) to which the present invention is applied accommodates a maximum of 4K links per ASS, this problem may occur because one ASS can simultaneously accommodate several RASMs and relay lines for connection with other stations. Resolved.

As described above, according to the present invention, the intercall blocking can be eliminated by connecting the RASM through the ASS having the timeslot exchange function, and the timing problem required when directly connecting to the INS can be solved.

Claims (3)

In a digital electronic switch system in which a plurality of ASSs having a timeslot switching function and an INS each connected through an optical link implement a space switch function, a RASM for accessing a remote subscriber is connected with the ASS to connect a remote subscriber. And a time slot exchange in the ASS, so that space switching can be performed in the INS. The ASS is a time for inputting / outputting 8.192 Mbps 10-bit data by inputting and submultiplexing and submultiplexing data collected from a digital concentrator and exchanging timeslots according to a predetermined condensation ratio. Positioning unit (TWS: 211) and: Adds the frame allocation word (FAW) and data for IPC to the 1K PCM data received from the time switch unit 211, CMI conversion to convert to an optical signal, from the optical link Local data link (LDL: 212) which converts the received optical signal into an electrical signal and outputs the PCM data to the time switch unit 211 after reraming: A relay line for connecting the RASM to the PCM link through the time switch unit. / Remote subscriber exchange module (RASM) connection device of the digital electronic switchboard, characterized in that the local data link (TCDL: 241) is provided. 2. The subscriber station of claim 1, wherein the remote subscriber exchange module (RASM) includes: a time switch unit (TSW) 242 for exchanging timeslots by connecting a remote subscriber; and a relay line / local unit for connecting the time switch unit to a ASS via a PCM link. Remote subscriber exchange module (RASM) connection device of the digital electronic switchboard, characterized in that the data link unit (TLDL: 241) is provided.