JPH0530185A - Route control system - Google Patents

Abstract

PURPOSE:To prevent a repeating line to an incoming station exchange from becoming an overload state by switch-connecting the repeating line connecting an exchange stopping an exchange function with the incoming station exchange to the other exchange via a bypass repeating line. CONSTITUTION:When an exchange 200 stops the function, a repeating line switch means 201 detaches the repeating line 4 and connects it with the bypass repeating line 5. When the switch means 201 of the other exchange connected by the bypass line 5 connects the repeating line 4 with the bypass line 5, a route control means 202 sets an incoming call to the incoming station exchange 100 and therefore the repeating line 4 and the bypass line 5 are selected. When the bypass line 5 is not connected with the repeating line 4 in any exchange, the means 202 blocks the incoming call in the exchange 100. Thus, the repeating lines whose number is the same as a case before the exchange function stops can be secure. The repeating line to the exchange 100 is prevented from becoming the overload state and the deterioration of service in an exchange network can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a route control system in a switching network having a plurality of exchanges connected to the same destination exchange by trunk lines.

[0002]

2. Description of the Related Art FIG. 3 is a diagram showing an example of a conventional switching network. In FIG. 3, one set of local exchanges 1, three sets of relay exchanges 2 (individual relay exchanges are referred to as 2 _A , 2 _B , and 2 _C ), and subscribers 3 accommodated in the local exchange 1. And a local exchange 1 and transit exchanges 2 _A and 2 _B , and a transit line 4 that connects the transit exchanges 2 to each other (the individual transit lines are referred to as 4 _M , 4 _N , 4 _O , 4 _P, etc.). Is shown.
Although each relay line 4 is represented by only one line in FIG. 3, a plurality of lines are actually provided.

In such a switching network, the local exchange 1
Raise and relay switch 2_CVia trunk line 4_QCall to
Call (hereinafter outgoing route R_QIs called a relay)
Line 4 _M, Transit switch 2_AAnd trunk line 4_OConnection via
Continuation route and trunk line 4_N, Transit switch 2_BAnd trunk line 4
_PShall be evenly distributed to the connection route via
It

A route selection table (MBT) is provided in a central processing unit (CP) 12 that controls exchange processing in the local exchange 1.
121 is provided. Route selection table (MBT) 121
Is the outgoing route R designated by the call originating in the local exchange 1.
In response to the _Q, the relay line 4 _M network (NW) 11
A trunk group TG _M indicating an outgoing trunk (OGT) 14 _1M connected to the network, a trunk group TG _N indicating an outgoing trunk (OGT) 14 _1N connecting the trunk line 4 _N to the network (NW) 11, and each trunk group TG Blocking information B indicating whether or not _M and TG _N can be selected is shown. If the trunk groups TG _M and TG _N are not blocked, the corresponding blocking information B
Is set to the blocking release state (for example, logical "0"), and when each trunk group TG _M and TG _N is blocked, the corresponding blocking information B is set to the blocking state (for example, logical "1"). Has been done.

When the repeater exchanges 2 _A and 2 _B are operating normally, the blockage information B corresponding to each of the trunk groups TG _M and TG _N is set to the blockage release state, that is, logical "0". There is.

[0006] In this state, when the subscriber 3 accommodated in the local exchange 1 issues a call designating the outgoing route R _Q , the central processing unit (CP) 12 has a route selection table (MBT) 12
1 and recognizes that the trunk groups TG _M and TG _N are both in the unblocking state in response to the outgoing route R _Q from the subscriber 3, and selects the trunk groups TG _M or TG _N alternately. , Select an empty trunk (OGT) 14 _1M belonging to the selected trunk group (eg, TG _M ) and make an incoming call to the transit switch 2 _C via the transit line 4 _M , transit switch 2 _A and transit line 4 _O. .

[0007] Thus, the call is a relay line 4 _O for connecting the transit exchange 2 _A and transit exchange 2 _C, transit exchange 2 _B and transit exchange 2 to specify the outgoing path R _Q that occur local exchange 1 _The trunk line _4P connecting _C and _C will be used equally.

Next, for example, the relay exchange 2_BStopped operating
If it does, the originating route R that occurs in the local exchange 1_QTo
Make a call to specify trunk 4_N, Transit switch 2_BAnd relay
Line 4 _PThe route selection table (M
Route R in BT) 121_QTrunk group TG corresponding to
_NThe blocking information B of is set to the blocking state (logical “1”).

When a call for designating the outgoing route R _Q occurs in the local exchange 1 thereafter, the central processing unit (CP) 12 refers to the route selection table (MBT) 121 and refers to the trunk corresponding to the outgoing route R _Q. Only the group TG _M is in the blockage released state (blockage information B
= Logical "0"), the trunk group TG _N is recognized to be in the blocked state (blocking information B = logical "1"), only the trunk group TG _M is selected, and the trunk line 4 _M and the relay switch 2 are selected.
_The call is sent to the transit exchange 2 _C via _A and the transit line 4 _O.

[0010] Thus, the call to specify the outgoing path R _Q that occur local exchange 1, and thus the use of all trunks 4 _O, trunks 4 _O and 4 _P are both city Assuming that only 50% of the calls that specify the outgoing route R _Q occurring in the exchange 1 are designed as loads, the trunk line 4
There is a possibility that the load of _O will be doubled and the load will be overloaded, and the service of the switching network will be significantly reduced.

It should be noted that although the load of twice as much as usual is applied to the trunk line 4 _M connecting the local exchange 1 and the repeater exchange 2 _A, and also to the repeater exchange 2 _A , in the present invention, the trunk line 4 _O
And 4 focuses only on _P, trunk 4 _M, 4 _N and transit exchange 2 _A, 2 _B and the like are intended to withstand even twice the load.

[0012]

As is clear from INVENTION Problems to be Solved] The above description, in the switching network in the prior art, originating path R _Q a call specifying the trunk 4 _O and 4 that occur local exchange 1
When designed as being evenly distributed _P also, the transit exchange 2 _B stops operating, using all call only trunk 4 _O to specify the outgoing path R _Q that occur local exchange 1 Therefore, there was a problem that the trunk line 4 _O was overloaded and the service of the switching network was significantly reduced.

It is an object of the present invention to prevent the specific trunk line in the switching network from being overloaded as much as possible even when the switching device stops the switching function.

[0014]

FIG. 1 is a diagram showing the principle of the present invention. In FIG. 1, 100 is a destination exchange, and 20
0 is a plurality of exchanges, 4 is each exchange 200 and the destination exchange 1
It is a relay line for connecting with 00.

Reference numeral 5 is a bypass relay line provided between the respective exchanges 200 according to the present invention. 201 is a trunk line switching means provided in each exchange 200 according to the present invention.
202 is a route control means provided in each exchange 200 according to the present invention.

[0016]

The relay line switching means 201 disconnects the relay line 4 from the own exchange 200 and connects it to the predetermined detour relay line 5 when the exchange 200 stops the exchange function.

The route control means 202 is another exchange 2 connected by the bypass trunk line 5 connected to the own exchange 200.
When the trunk line switching means 201 provided in 00 connects the trunk line 4 and the bypass trunk line 5, the trunk line 4 and the bypass trunk line 5 are set together with the trunk line 4 in order to set a call to arrive at the destination exchange 100. Allow choice.

Note that the relay line switching means 201 is considered to dispersely connect the relay line 4 to the bypass relay line 5 that connects to a plurality of other exchanges 200, and wiring for accommodating the relay line 4 and the bypass relay line 5. It is considered to be realized by changing the connection in the board.

Further, the route control means 202 includes the own exchange 20.
Which of the other exchanges 200 has the bypass trunk line 5 connected to 0
Also, in the above, it is considered that the call incoming to the destination exchange 100 is blocked when the call is not connected to the trunk line 4.

Further, the route control means 202 is provided for each exchange 20.
0 is a trunk line 4 for each of a plurality of destination exchanges 100
When any of the exchanges 200 stops the exchange function while being connected by, it is considered that all the bypass trunk lines 5 connected to the own exchange 200 collectively function.

Therefore, the relay line connecting the exchange that has stopped the exchange function and the destination exchange is switched and connected to another exchange via the bypass relay line, and the same number as before the stop of the exchange function. Since the trunk line is secured, it is possible to prevent the trunk line to the destination exchange from being overloaded, and to prevent deterioration of the service level of the switching network.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing a switching network according to an embodiment of the present invention. The same reference numerals denote the same objects throughout the drawings.

In FIG. 2, the destination exchange shown in FIG.
Relay switch 2 as 100_CIs shown in FIG.
Two relay exchanges 2 as a plurality of exchanges 200_AAnd
And 2 _B, And the trunk line switching means 20 in FIG.
Wiring board 25 as 1_AAnd 25_BEach relay switch 2_A
And 2_BAnd the route control means in FIG.
A group management unit 223 as 202_AAnd 223_BEach relay
Exchange 2_AAnd 2_BCentral processing unit (CP) 22_A
And 22_BIt is provided inside.

The relay exchanges 2 _A and 2 _B are connected to the detour relay line 5
Are connected to each other by. The detour relay line 5 includes a relay line 4 _O connecting the relay exchange 2 _A and the relay exchange 2 _C ,
Trunk line 4 connecting trunk switch 2 _B and trunk switch 2 _C
It has the same number of lines as _P , but only one is shown in FIG.

The trunk exchange 2 _A has an outgoing trunk (OGT) for connecting the trunk line 4 _O to the network (NW) 21 _A.
24 _AO and detour relay line 5 to network (NW) 21 _A
There is provided an outgoing trunk (OGT) 24 _A5 to be connected to the central processing unit (CP) 22 _A , and station data (TG) corresponding to all outgoing trunk (OGT) 24 _AO is provided in the central processing unit (CP) 22 _A.
C) 222 _AO and station data (TGC) 222 _A5 corresponding to all-out trunk (OGT) 24 _A5 are provided.

Station data (TGC) 222 _AO and 222
Each _A5 is provided with a trunk line identifier G, and the trunk line identifier G provided in the station data (TGC) 222 _AO is the trunk line 4 _O connected to the corresponding outgoing trunk (OGT) 24 _AO. Is set to logic "0" indicating that the line is a regular line used by a normal call, and station data (TG
C) The trunk line identifier G provided in 222 _A5 is used when the bypass trunk line 5 connected to the corresponding outgoing trunk (OGT) 24 _A5 is in an emergency when the repeater exchange 2 _A or 2 _B stops operating. It is set to logic "1" indicating that it is an emergency line.

In the central processing unit (CP) 22 _A , a route selection table (MBT) 121 in the local exchange 1 is provided.
A route selection table (MBT) 221 _A similar to the above is provided, and the outgoing trunk (OGT) 24 is associated with the outgoing route R _Q.
And a trunk group TG _O corresponding to the _AO, out of the trunk (OG
The trunk group TG ₅ corresponding to T) 24 _A5 is shown as a selection target.

Further, in the wiring board 25 _A , the jumper line J _A1 connecting the relay line 4 _O and the outgoing trunk (OGT) 24 _{AO in the} normal state where the relay exchanges 2 _A and 2 _B are normally operated is A jumper wire J which is in a conductive state and which connects the bypass trunk line 5 and the outgoing trunk (OGT) 24 _{A5
All of A2} and the jumper wire J _A3 connecting the relay line 4 _AO and the bypass relay line 5 are set to the cutoff state.

Therefore, for a call that specifies the outgoing route R _Q received from the local exchange 1 via the trunk line 4 _M ,
Only the outgoing trunk (OGT) 24 _AO (the trunk line 4 _AO connected to it) can be selected, and the outgoing trunk (OGT) 2
4 _A5 (backhaul line 5 connected to) because it is impossible selection, routing table (MBT) 221 _A blockage information B is unblocked state corresponding to the trunk group TG _O corresponding to the outgoing path R _Q of (Logical “0”), the trunk group T
The blocking information B corresponding to G ₅ is set to the blocking state (logical “1”).

Also in the repeater exchange 2 _B , the repeater exchange 2
_{As in A} , connect trunk line 4 _P to network (N
W) Outgoing trunk (OGT) 24 _BP connected to 21 _B ,
An outgoing trunk (OGT) 24 _B5 for connecting the bypass trunk line 5 to the network (NW) 21 _B is provided, and a full outgoing trunk (OGT) 24 _BP is provided in the central processing unit (CP) 22 _B. Station data (TGC) 222 corresponding to
_BP and station data (TGC) 222 _B5 corresponding to the all-out trunk (OGT) 24 _B5 are provided, and the trunk line identifier G provided in the station data (TGC) 222 _BP is provided.
It is set to a logic "0" indicating that the trunk line 4 _P is a conventional circuit that is used by the normal call, station data (TG
C) The trunk line identifier G provided in 222 _B5 is a logical "1" indicating that the bypass trunk line 5 is an emergency line used in an emergency when the trunk exchange 2 _A or 2 _B has stopped operating. It is set to ".

[0031] central processing system unit (CP) 22 routing tables in the _B (MBT) 221 is provided with _B, trunk group corresponding to the trunk (OGT) 24 _BP out in response to the outbound path R _Q TG _P and blocking information B, and a trunk group TG ₅ and blocking information B corresponding to the outgoing trunk (OGT) 24 _B5 are shown.

Also in the wiring board 25 _B , the jumper line J _B1 for connecting the trunk line 4 _P and the outgoing trunk (OGT) 24 _{BP in the} normal state in which the relay exchanges 2 _A and 2 _B are normally operated. A jumper wire J which is in a conductive state and which connects the bypass trunk line 5 and the outgoing trunk (OGT) 24 _B5
B2 and the jumper line J _B3 connecting the relay line 4 _BP and the bypass relay line 5 are all set to the cutoff state.

[0033] Therefore, for the call to specify the outgoing path R _Q coming via the trunk line 4 _N from the local switch 1,
Only the trunk line 4 _BP connected to the outgoing trunk (OGT) 24 _BP can be selected, and the bypass trunk line 5 connected to the outgoing trunk (OGT) 24 _B5 cannot be selected. Therefore, the route selection table (MBT ) The blocking information B of the trunk group TG _P corresponding to the outgoing route R _Q of 221 _B is in the blocking release state (logical “0”)
The trunk information TG ₅ of the trunk group TG ₅ is set to the blocked state (logical “1”).

In this state, for example, the relay exchange 2_BHas luck
When the service is stopped, transit switch 2_AIn the
Line board 25_AJumper wire J provided in_A1Is conductive
With the status set to, jumper wire J_A2Is also a continuity
State, jumper line J _A3Only remains blocked
And repeater exchange 2_BIn the wiring board 25_BSet up
Jumper line J_B1And J_B2Is in the cutoff state
Fixed, jumper line J_B3Is set to a conductive state.

[0035] As a result, in the transit exchange 2 _B, will be trunk 4 _P is connected trunk (OGT) one-to-one with the backhaul line 5 disconnected from 24 _BP out and in transit exchange 2 _A For trunk line 4 _O , exit trunk (O
The bypass relay line 5 is further connected to the outgoing trunk (OGT) 24 _{A5 while} being connected to the GT) 24 _AO .

Further, in the repeater exchange 2 _A , when the collective block release command for the emergency line is input from the input device (TTY) 26 _A , the group management unit 223 _A receives the collective block release command for the emergency line. Analyze and analyze all station data (T) provided in the central processing unit (CP) 22 _A.
The station data (TGC) 222 in which the trunk line identifier G is set to logic “1” is searched from the GC) 222, and the trunk line identifier G of the station data (TGC) 222 _A5 corresponding to the bypass trunk line 5 is logical. When it detects a is set to "1", the routing table (MBT) in 221 _a, originating the route R _Q
Block information B of the trunk group TG ₅ corresponding to the bypass relay line 5 provided corresponding to the block state (logical “1”)
To the blockage release state (logic “0”).

In this state, the local exchange 1 to the trunk line 4
_When a call that specifies the outgoing route R _Q is received via _N ,
Central processing unit (CP) 22 _A is route selection table (MBT)
Referring to 221 _A, originating path corresponding to R _Q both trunk groups TG _O and TG ₅ recognizes that in a closed release state, select the trunk group TG _O or TG ₅ alternately, trunk group TG _{If O} is selected, select the vacant trunk (OGT) 24 _AO to which it belongs and select the wiring board 25 _A
Via a jumper J _A1 and trunk 4 _O are rung in transit exchange 2 _C in, and when you select the trunk group TG ₅ is out empty belongs trunk (OGT) 24
_A5 is selected, and the jumper line J _A2 in the wiring board 25 _A , the bypass relay line 5, the jumper line J _B3 in the wiring board 25 _B in the relay exchange 2 _B , and the relay line 2 _P are connected to the relay exchange 2 _C. Make an incoming call.

Therefore, the relay exchange 2_BWill stop operating
In the local exchange 1, route selection is performed as described above.
Route R in table (MBT) 121_QTrunk group corresponding to
TG _NBlock information B corresponding to the block status (logical "1")
All outgoing routes R that are set to the local exchange 1
_QThe call that specifies_MVia
Relay switch 2_ATo the relay exchange 2_AIs outgoing
Route R_QA call that specifies_OAnd detour relay line 5
And trunk line 4_PRelay switch 2 with even distribution to_CTo
Relay line 4 to receive an incoming call_OAnd 4_PLoad is relay exchange
Machine 2_BThe same as when it is in operation, an overload condition occurs
Is prevented.

As is clear from the above description, according to the present embodiment, the transit exchange 2 _B stops operating and the local exchange 1
All calls that specify the outgoing route R _Q that occurred in
Even when an incoming call arrives at the repeater exchange 2 _A via the repeater line 4 _M , the repeater exchanger 2 _A equally distributes it to the repeater line 4 _O and the detour relay line 5 and the repeater line 4 _P, and the repeater exchange device 2 _C In order to make an incoming call to the trunk line, the load on the trunk lines 4 _O and 4 _P is
_As in the case where _B is in operation, overload is prevented from occurring.

It is to be noted that FIG. 2 is merely an embodiment of the present invention, and is not limited to, for example, the one in which the relay exchange 2 _B stops operating, and it is also considered that the relay exchange 2 _A stops operating. However, the effect of the present invention does not change in any case. Further, the relay line switching means 201 is not limited to the wiring board 25 having the jumper wire J, and many other modifications can be considered, but in any case, the effect of the present invention does not change. Further, the exchange 200 is not limited to the two sets of relay exchanges 2 _A and 2 _B , and it is considered that there are three or more sets of relay exchanges. By connecting, the effect of the present invention does not change even in such a case. In addition, the destination exchange 100
Is not limited to one relay exchange 2 _C , and a plurality of relay exchanges 2 _C may be considered, but the effect of the present invention does not change in such a case. Further, the switching network to which the present invention is applied is
It goes without saying that the present invention is not limited to the illustrated one.

[0041]

As described above, according to the present invention, in the above switching network, the trunk line connecting the switching function that has stopped the switching function and the destination switching center is switched and connected to another switching center via the bypass trunk line. Since the same number of trunk lines as before the switching function was stopped is secured, it is possible to prevent the trunk lines leading to the destination switchboard from being overloaded and prevent the service level of the switching network from deteriorating. Becomes

[Brief description of drawings]

FIG. 1 is a diagram showing the principle of the present invention.

FIG. 2 is a diagram showing a switching network according to an embodiment of the present invention.

FIG. 3 is a diagram showing an example of a conventional switching network.

[Explanation of symbols]

1 local exchange 2 Relay switch 3 subscribers 4 trunk lines 5 detour relay line 11, 21 Network (NW) 12, 22 Central processing unit (CP) 14, 24 Outgoing trunk (OGT) 23 Incoming Trunk (ICT) 25 wiring board 26 Input device (TTY) 100 destination switch 121,221 Route Selection Table (MBT) 200 switch 201 Relay line switching means 202 Route control means 222 station data (TGC) 223 Group Management Department

Claims (5)

[Claims] 1. A plurality of exchanges (2) each connected to the same destination exchange (100) by a trunk line (4).
00), a detour relay line (5) for connecting the exchanges (200) to each other is provided, and when the exchange (200) stops the exchange function in each exchange (200). , A relay line switching means (201) for disconnecting the relay line (4) from the own exchange (200) and connecting with a predetermined detour relay line (5), and the detour relay line (201) connected to the own exchange (200). 5)
When the relay line switching means (201) provided in another exchange (200) connected by means of connecting the relay line (4) and the detour relay line (5), the destination exchange ( A route control system (100) is provided with a route control means (202) which permits selection of the bypass line (5) together with the relay line (4) in order to set an incoming call. 2. The trunk line switching means (201) dispersively connects the trunk line (4) to a bypass trunk line (5) that connects a plurality of other exchanges (200). 1. The route control method described in 1. 3. The route according to claim 1, wherein the relay line switching means (201) is realized by changing a connection in a wiring board accommodating the relay line (4) and the detour relay line (5). control method. 4. In the route control means (202), the bypass trunk line (5) connected to the own exchange (200) is connected to the trunk line (4) in any other exchange (200). If the call is not received, the call is blocked for the call received at the destination exchange (100).
The described route control method. 5. The route control means (202), wherein each of the exchanges (200) is connected to a plurality of destination exchanges (100) by a trunk line (4),
2. When all of the exchanges (200) stop the exchange function, they collectively function for all of the bypass trunk lines (5) connected to the own exchange (200). Route control method.