JPH077993B2 - Signal relay station system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention is a signal relay station system that performs a message transfer function in a No. 7 common line signaling network recommended by the International Telegraph and Telephone Consultative Committee (CCITT). Regarding

[Prior Art] Generally, the inter-station signal system of an electronic exchange is a line individual signal system in which R2 multi-frequency code signals are exchanged through a trunk line and a signal line through a common line that is not a trunk line. There is the No. 7 common line signal system for transmitting.

The No. 7 common line signaling system is a signaling system that can reduce automatic connection delay, provide abundant signal capacity, and efficiently manage communication networks more efficiently than the existing R2 multi-frequency coded signaling system. Is indispensable for the formation of a comprehensive information and communication network.

In addition, No. 7 common line signaling is a technology to transmit messages related to thousands of communication circuits through a single channel using signal messages in the form of computer communication protocol through a trunk line and a separate common signal channel at 64 kbps. It is designed to be suitable for digital communication networks, and is designed to operate efficiently at lower speeds and analog communication networks.

[Problems to be Solved by the Invention] FIG. 2 shows the hierarchical structure of the message transfer unit of the No. 7 common line signaling protocol recommended by the International Telegraph and Telephone Consultative Committee.

The message transfer unit in the hierarchical structure of the No. 7 common line signaling system shown in FIG. 2 is implemented by a hardware system,
The message transfer unit is a kind of transmission protocol for surely transmitting a message between the functions of the user unit between two electronic exchanges, and has three hierarchical structures of levels 1, 2, and 3 shown by L1, L2, and L3 in the figure. Have.

The message transfer function is roughly classified into a signal data link function of level 1 function L1, a signal link function of level 2 function L2, and a signal network function that performs a signal message processing function and a signal network management function as a level 3 function L3. To be done.

The signaling repeater performs the function of a message transfer unit, and signaling messages input / output to / from the signaling relay station are transmitted by a high-speed signaling link.

And, when such a signal relay station is actually introduced into a common line network, it must accommodate hundreds of signal links, and therefore the International Telegraph and Telephone Advisory Committee normally loads (0.
It is recommended that the signal message transmission delay time is 20 ms or less at the time of 2 erlangs.

In order to realize a signal relay station that provides large capacity and high performance, the performance of the unit that performs the level 2 function L2 and the level 3 function L3 of the message transfer unit must satisfy this. It is difficult for a processor to satisfy such performance, and in order to accommodate hundreds of signal links,
Performance must be spatially distributed by multiple processors.

From this point of view, first, Level 2 of the message transfer unit
The function L2 and the level 3 function L3 can be distributed to different units from each other, and it is sufficient if there is a device capable of transmitting and receiving a signaling message between the two units.
Units can independently accommodate one or many signaling links.

However, as described above, it is difficult to control hundreds of level 2 units with one level 3 unit, and thus the level 3 function must be horizontally distributed to a large number of units.

The level 3 function L3 of the message transfer section is roughly classified into a signal message processing function and a signal network management function. Normally, only the signal message processing part mainly operates, and the signal network management part is a signal link or a level 2 unit. It works when an error occurs.

Since the signaling network management part has to manage all signaling links or level 2 units, it is easy to centrally manage one module.

That is, it is easy to implement the signal message processing part and the signal network management part of the message transfer part separately, and at this time, the signal message processing part includes hundreds of level 2 levels.
Since the units are processed in a distributed manner, they should be distributed to several modules. Here, the distribution does not mean the distribution of signal message functions, but means that there are several level 3 units that perform the same function.

In this way, in order for the level 3 function signal processing function of the message transfer unit to be distributed to the level 3 units, each level 3 unit only needs to have the same level 3 route selection table. Is used when checking the output signal link. That is, the message input via the signaling link is processed by the level 2 unit, and then the level 3 unit accepts a check as to which route the message is output. Select the output signal link by looking at the table.

Since each level 3 unit has the same routing table, the same output signal link is selected no matter which level 3 unit the signal message is input to, and the signal message flowing through each signal link is The order is kept and sent to the same level 3 unit.

That is, several Level 3 units typically share and process the signaling messages input by the signaling links assigned to them.

It is possible to disperse the message transfer unit into such a unit, but next, it suffices to solve how to connect the spatially dispersed units. The configuration of connecting the units affects the performance of the signal relay station. .

Figure 3 shows the structure of a signal relay station developed by Italy's GTE (GTE) and France's ALCATEL. In FIG. 3, 210a to 210m are level 3
Units, 220 are level 2-3 connection networks, 240a to 240n are level 2 units, and 250a to 250n are signaling links.

In the configuration of the signal relay station shown in FIG. 3, the level 2 units 240a to 240n and the level 3 units 210a to 210m are all connected to one common connection network 220, and here, the signal link 250a to The signaling message input to any of 250n is transmitted to the corresponding level 3 unit 210a to 210m through the level 2-3 connection network 220. It then passes through the Level 2-3 network 220 again for transmission on the output signaling link selected by such Level 3 unit. Therefore, a signaling message input to one signaling link may pass through the level 2-3 connection network 220 twice.

Figure 4 shows AT & T in the United States.
(Registered trademark) and Nippon Telegraph and Telephone Corporation of Japan (NT
T) (registered trademark) shows the structure of a signal relay station developed and used.

In FIG. 4, reference numeral 300 designates a level 3-3 connection network, and 310a to 310n.
Indicates level 3 units, 340a to 340n indicate level 2 units, and 350a to 350n indicate signal links.

In the configuration of the signal relay station shown in FIG. 4, the level 2 units 340a to 340n are connected to the corresponding level 3 units 310a to 310n via their own connection networks, and the signal links 350a to 350n are connected.
The signaling message input to is transmitted via the level 3-3 connection network 300.

In such a configuration, the level 3 unit must handle the original functions of the signal message processing function and the internal message transmission / reception function, and only by using a high speed level 3 processor to handle this. However, unlike the configuration of FIG. 3, this configuration has the same performance because the signaling message input through the signaling links 350a to 350n passes through the level 3-3 connection network 300 only once. If a connection network is used and the number of signal links that can be accommodated is increased to accommodate the same number of signal links, the performance of the signal relay station can be improved, but in the case of the United States,
One level 3 unit, for example, 310a controls one level 2 unit 340a, and is realized by an integrated unit. It is difficult to improve the performance of a signal relay station. In Japan, several signal links are connected to one level. Since it has a configuration in which it is connected to two units and controlled, this configuration also has a problem that it is difficult to improve the performance of the signal relay station.

Therefore, an object of the present invention is to configure a signal relay station that performs a message transfer function in a No. 7 common line signaling network,
It is an object of the present invention to provide a signal relay station system capable of maximizing the capacity that can be accommodated by the entire signal relay station and reducing the signal message transmission delay time.

[Means for Solving the Problems] In order to achieve such an object, the present invention provides Level 3
A plurality of level 3 units that perform a signal processing function as a function, a single signal network management unit that also performs a signal network management function, and a plurality of level 3 units are provided for each, and each of them is input. In a signal relay station system having a distributed memory for accumulating signal messages and including a plurality of level 2 units performing a level 2 function, and performing No. 7 common line signal network processing, a plurality of level 3 units are connected to each other. A level 3-3 connection network for connection, a control connection network for connecting a plurality of level 3 units and a signal network management unit, a level 3 unit, and a plurality of level 2 units corresponding to the level 3 unit are distributed memory. Through
The present invention is characterized by arranging a level 2-3 connected network, a level 3-3 connected network, a level 3 unit, a level 2-3 connected network, a distributed memory and a level 2 unit in a multi-tiered form. .

Another aspect of the present invention is characterized in that the level 3 unit is connected to the level 2 unit via a parallel bus for control.

Yet another form is characterized in that the level 3 unit is connected to the level 2 unit via a distributed memory and controlled.

Still another mode is characterized in that the parallel bus is configured to connect and control the level 3 unit to the level 2 unit regardless of the presence or absence of the parallel bus interface.

Yet another form is characterized in that the signaling message stored in the distributed memory is immediately routed by the level 3 unit without the memory moving by the parallel bus.

[Operation] According to the present invention, the level 3-3 connection network is used to form the level 3 unit and the level 2 unit in an independent connection network, and the entire signal relay station is accommodated by using the distributed memory. It is possible to increase the possible capacity and reduce the signaling delay time.

Embodiments Embodiments of the present invention will be described in detail below with reference to the drawings.

One embodiment of the present invention is shown in FIG. Where 400 is level 3
-3 connection network, in which level 3 units 410a to 410m are connected. In addition, the level 3 units 410a to 410m are control connection networks.
It is also connected to the signal network management unit 460 via 470. 420a to 420m are level 2-3 connection networks, and level 3 units 410a that independently correspond to level 2 units 440a to 440k.
Connect to ~ 410m. Reference numerals 430a to 430k are distributed memories of the corresponding level 2 units 440a to 440k, respectively, and store input signal messages from the signal links 450a to 450k corresponding to the level 2 units 440a to 440k.

The level 2-3 connection networks 420a to 420m connect the input signal messages stored in the distributed memories 430a to 430k of the level 2 units 440a to 440k to the level 3 units 410a to 410m using a parallel bus outside the units.

In this embodiment, the signal message input with such a configuration is processed as follows.

For example, the signal link 45 input to the level 2 unit 440a
The signaling messages via 0a are stored in the distributed memory 430a, and the signaling messages stored in the distributed memory 430a are immediately routed by the level 3 unit 410a without movement of the memory via the external parallel bus.

Therefore, the output path is roughly divided into two. One of them is a level 2 unit 440a connected to the same level 3 unit 410a and is sent via a level 2-3 connection network 420a, and the other is a different level 3 unit, for example 410g. This is the case when a route is selected.

Here, when the route is selected by the level 3 unit 410g, the route is as shown in FIG. 4, but the level 3 unit 410g
If the path is selected at, the transmission time of the signaling message is reduced by performing a memory copy to the next distributed memory 430b in the distributed memory immediately by the level 3 unit 410a.

In addition, since the signaling message traffic is distributed in the same level 3 unit 410a, the traffic of the level 3-3 connection network 400 is reduced, which is a signal link that can be attached to the signaling network management unit 460 via the control connection network 470. Not only the number increases, but also the transmission delay time of signaling messages passing through the level 3-3 connection network 400 decreases.

[Effects of the Invention] As is apparent from the above, according to the present invention, the level 3-3 connection network is used to configure the level 3 unit and the level 2 unit as independent connection networks, and the distributed memory is used. This has the effect of increasing the capacity that can be accommodated by the entire signal relay station and reducing the signal message transmission delay time.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a hierarchical configuration diagram of a message transfer part of No. 7 common line signaling protocol, and FIG. 3 is a signal relay developed in France and Italy. FIG. 4 is a block diagram showing the configuration of the station, and FIG. 4 is a block diagram showing the configuration of the signal relay station developed in the United States and Japan. 400 …… Level 3-3 connection network, 410a ～ 410m …… Level 3 unit, 420a ～ 420m …… Level 2-3 connection network, 430a ～ 430k …… Distributed memory, 440a ～ 440k …… Level 2 unit, 450a ～ 450k ... Signal link, 460 ... Signal network management unit, 470 ... Control connection network.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Lee Young Hee, Chungnam Daejeong Sithong Villa Edon Hyundai Apartment 6-1402 (72) Inventor Byeung Yeong Sik, Republic of Korea Chungnam Daejeong Si Suk Kajeong Dong 236-1 (72) Inventor Chung Daeyoung Dakshi Namuk Daemyung 9 Dong 917-3

Claims (5)

[Claims] 1. A plurality of level 3 units that perform a signal processing function as a level 3 function; a single signal network management unit that also performs a signal network management function;
A plurality of level 2 units provided for each of the units, each of which has a distributed memory for accumulating a signal message to be input, and a plurality of level 2 units for performing a level 2 function;
No.7 In a signal relay station system that performs common line signal network processing, level 3-that connects the plurality of level 3 units to each other
A three-connection network; a control connection network connecting the plurality of level 3 units and the signaling network management unit; the level 3 unit and a plurality of the level 2 units corresponding to the level 3 unit; A level 2-3 connection network connected via a memory, the level 3-3 connection network, the level 3 unit, the level 2-3 connection network, the distributed memory, and the level 2 unit having a plurality of layers. No. 7 common line signaling network signal relay station system characterized by being arranged in the form of. 2. A signal relay in a No. 7 common line signaling network according to claim 1, wherein said level 3 unit is configured to be connected to and controlled by said level 2 unit via a parallel bus. Station system. 3. A signal relay station in a No. 7 common line signaling network according to claim 1, wherein said level 3 unit is connected to said level 2 unit via a distributed memory and controlled. system. 4. The No. 7 common line according to claim 2, wherein the parallel bus is configured to connect and control the level 3 unit to the level 2 unit regardless of the presence or absence of the parallel bus interface. Signal relay station system in signal network. 5. The signaling message stored in the distributed memory is configured such that it is immediately routed by the level 3 unit without movement of the memory by the parallel bus. Or the No. described in 3.
7 Signal relay station system in common line signaling network.