JPS59135989A - Method for selecting relay line of exchange - Google Patents

Abstract

PURPOSE:To improve the utilizing efficiency of a relay line and to prevent the reduction in connection rate by not fixing pairs of outgoing and incoming lines between exchanges and forming pairs by idle outgoing and incoming lines. CONSTITUTION:The service priority of pairs (2a1, 2b1)-(2a2, 2b2) of all realy lines between the exchanges A1a, B1b is decided. When a call exists from the exchange A1a to the exchange B1b, the exchange A1a decides any outgoing line depending on the idle state of outgoing lines 2a1, 2a2 and the priority and decides any incoming line depending on the idle state of the incoming lines 2b1, 2b2 and the priority. For example, if only the incoming line 2b1 is in use among the incoming and outgoing lines, pairs of the relay lines (2a1, 2b2) are combined.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a trunk line selection method for an exchange, and particularly to a trunk line selection method in a switching network composed of multi-drop trunk lines.

FIG. 1 is a block diagram showing an example of the configuration of a relay line between exchanges on the ground, which does not include a rain relay or the like. In the figure, (la), (lb), and (lc) are exchanges A1, B1, and C, respectively, and (2ab), (2ha
).

(2ac), (2ca) nso11 relay line, (3a
b), (3b'a).

(3ac) and (3ca) are the output trunk and (3ca), respectively.
4ab), (4ba).

(4a'c) and (4ca) are human trunks, respectively. However, in FIG. 1, it is assumed that there are three exchanges A, B, and C, and parts other than those necessary for explaining the operation of exchange A are omitted.

From the perspective of switch A (1a), trunk line (2ab) is an outgoing line, trunk line (2ba) is an incoming line, and switch B (
From the point of view of lb), the trunk line (2ab) is an incoming line, and the trunk line (2ba) is an outgoing line, and (2ab) and (2ba
) constitute a fixedly combined bear, and the exchange A (l
The outward and return paths of audio and signals between a) and B (1b) are constituted by these bare (ab) and (2ba).

FIG. 2 shows exchange A (la) in the configuration of FIG. 1.

1 is a diagram showing an example of a sequence of a telephone signal between B (lb), in which the same reference numerals as in FIG.
is the acquisition signal, (6) is the selection signal, C7) is the response signal, (
8) is a disconnection signal, and (9) is a call termination signal. Each outgoing trunk (3ab), (3ba), (3ac), (3
ca) sends out these telephone signals and relays voice, and connects to the incoming trunk (4ab).

(4ba), (4ac)=(4ca) detects telephone signals and relays audio, but since these operations are well known, detailed explanation thereof will be omitted.

Next, FIG. 3 is a diagram showing an example of the configuration of a trunk line between meeting exchanges in satellite communication. In the figure, the same reference numerals as in FIG. 1 indicate the same or equivalent parts (2al).

(2a2), (2bl), (2b2), (2cl), (
2c2) are trunk lines, (3al), (3a2), and
(3bl), (3b2), (3cl), (3c2) are outgoing trunks, (4abl), (4ab2), (4
acl), (4ac2).

(4bal), (4ba2), (4cal)
, (4ca2) and (4bcl) are human trunks, respectively. In FIG. 3, the parts necessary to explain the operation of exchange A (la) are omitted from the drawing, but the differences from the configuration in FIG. 1 are, for example, the trunk line (2al).
, (2a2) is the incoming line of exchange B (lb) and the incoming line of exchange C (lc) at the same time, resulting in a multi-drop configuration.

In the conventional trunk line selection method, even in the configuration shown in FIG. 3, the outgoing line and incoming line are used as bare wires fixed in advance. For example, if we look at exchange A (la), for exchange g (1b), (2al, 2bl
), (2a2゜2b2) are connected to exchange C(l
c) for (2al.

2cl) and (2a2.2c2) were considered to be provided. Therefore, if a subscriber of exchange A (la) calls a subscriber of exchange B (lb), exchange A
(4a) is (2al, 2bl), (2a2, 2b2)
An empty trunk line bear was selected from among the bears. Therefore, for example, if trunk lines (2al) and (2b2) are in use and trunk lines (2bl) and (2a2) are vacant, (
Regardless of whether it is possible to connect if 2a2.2bl) is made bare, (2al, 2bl).

(2a2.2b2) could not be connected because both bares were not free.

FIG. 4 shows exchange A (la) in the configuration of FIG. 3.

3 is a diagram showing an example of a sequence of telephone signals between B (lb), in which the same reference numerals as in FIGS. 2 and 3 indicate the same, part, or the same signal; FIG. The difference from the case in Figure 2 is that it is a multi-drop configuration, so signals (5), (6), and (8) are signals destined for the incoming trunk (4abl), but they are not addressed to the incoming trunk (4abl).
acl), and signals (7) and (9) are signals destined for the incoming trunk (4bal), but they are also input to the incoming trunk (4b).
cl) is also input. Exchange C (lc) receives input signals to the incoming trunk (4acl) and (4bcl) to the incoming trunk (2al).

A status signal representing the status of (2b1) is set to in use or to idle status.

As mentioned above, even in the case of multi-drop trunk lines, the bare trunk line is fixed in the conventional method, so for example, exchange B (xb) uses a trunk line (2BL) to communicate with exchange C (lc). A call is in progress and switchboard A (l
a) connects exchange C (1c) using trunk line (2a2)
There was a drawback that if a call was in progress, even if trunk lines (2al) and (2b2) were free, connection could not be made even if there was a call request from exchange A (la) to another exchange. .

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and instead of fixing the relay wire bare, it is possible to assemble the bare wire at any time by using a vacant outgoing line and a vacant incoming line. It is an object of the present invention to provide a trunk line selection method that can prevent a drop in connection rate due to a busy trunk line.

Hereinafter, the present invention will be explained in detail with reference to the drawings. In the example shown in Figure 3, the trunk lines between exchanges A (la) and B (1b) are (2a1.2bl), (2al
.

There are 4 bears: 2b2), (2a2.2bl), and (2g2, 2b2). The priority order of bare usage is determined in advance between exchanges A (la) and B (lb). For example, assume that the above order represents priority. From a subscriber belonging to exchange A (la) to exchange B (
If a call is made to a subscriber belonging to
In (la), one of the outgoing lines is determined depending on the availability and priority of the outgoing lines (2al) and (2a2), and the incoming line (
2bl) and (2b2), the incoming line is determined based on the availability status and priority order. (2al), (2a
2), (2bl), (2b2), (2bl
) were in use (2al, 2b2
) bears are assembled. The other operations are similar to the conventional method. In addition, in the example shown in FIG. 3, the bears that can be configured between exchanges A (la) and C (lc) are (2al, 2cl
).

(2al, 2c2), (2a2.2cl), (2a2.
2c2).

The above describes a satellite communication meeting switching network as a typical example, but this invention also applies to switching networks with a multi-drop trunk line configuration and switching networks in which multi-drop trunk lines and normal trunk lines coexist. Can be applied to everything.

Furthermore, although a telephone switched network has been described, the invention can also be applied to a data switched network.

In the embodiment shown in FIG. 3, there are two sets of outgoing lines from each exchange, that is, lines that are multi-dropped as incoming lines, but the present invention is not limited to this number of sets.

As described above, according to the present invention, the bare incoming and outgoing lines between exchanges are not fixed, and the bare incoming and outgoing lines are assembled using vacant incoming and outgoing lines, which improves the efficiency of trunk line usage. This can prevent the rate from decreasing.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an example of the configuration of trunk lines between exchanges on the ground, and Fig. 2 shows exchange A in the configuration of Fig. 1;
FIG. 3 is a block diagram showing an example of the configuration of a relay line between exchanges for meeting in satellite communication, and FIG.
It is a figure which shows the sequence example of the telephone signal between B. (la) --- Exchange A, (xb) --- Exchange B
, (lc) ,. Exchange C, (2al), (2a2), (2bl), (2
b2), (2cl)-(2c2)...respectively multi-dropped trunk lines. The same reference numerals in the figures indicate the same or corresponding parts. Figure 1 (4ba) - (2ba) □ (3ba) Figure 3 Procedural amendment w5863 Mr. Commissioner of the Japan Patent Office (Monday, Showa) 1. Indication of the case Patent application No. 12034/1982 2. Invention name exchanger Relay line selection method 3, relationship with the case of the person making the amendment Patent applicant address 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name (601) Mitsubishi Electric Corporation Representative Hitoshi Katayama 4, Agent ( 1) "Claims" column of the specification (2) Contents of amendments to "Detailed Description of the Invention" column 6 of the specification (1) Claims of the specification Comment (2) On page 5, line 18 of the specification, the phrase ``a status signal representing the status'' is corrected to ``the status''. 7. List of attached documents (1) Revised scope of patent claims
... 1 or more × Attachment 2, Claims A switching network in which exchanges are connected by multi-drop trunk lines, and an outgoing line from one exchange serves as an incoming line to multiple other exchanges. In the trunk line selection method of an exchange when a subscriber connected to an arbitrary exchange A makes a call to another subscriber connected to an arbitrary exchange B, Determine in advance the types of all ingress/egress line pairs that can be configured between all trunk lines that enter into switch B and all trunk lines that exit from switch B and enter switch A. A step of predetermining the usage priority for all the above-mentioned incoming/outgoing line pairs between the above-mentioned exchanges A and B, and a step of determining the above-mentioned usage priority from among the free pairs among all the above-mentioned incoming/outgoing line bears. transmitting and receiving telephone signals using one pair of incoming and outgoing lines selected according to the above, and in exchanges other than the above-mentioned exchanges A and B, detecting the above-mentioned telephone signal input from the incoming line of the exchange and transmitting the corresponding incoming line A method for selecting a trunk line of an exchange, comprising the steps of setting the usage state of the switch to "in use".

Claims (1)

[Scope of Claims] In a switching network in which exchanges are connected by multi-drop trunk lines, and outgoing lines from one exchange are connected to incoming lines to multiple other exchanges, any exchange A In the trunk line selection method of an exchange when a subscriber connected to an exchange B makes a call to a subscriber connected to any other exchange B, all outgoing lines from an exchange A and incoming lines to an exchange B are The step of predetermining the types of all the ingress/egress line pairs that can be configured between the trunk line and all the trunk lines that are outgoing lines from exchange B and incoming lines to exchange A; a step of predetermining the usage priority for the line pair between the exchanges A and B; and one ingress/egress line selected from among the vacant bears among all the above-mentioned ingress/egress line bears according to the usage priority. In the step of transmitting and receiving telephone signals using a pair, and in exchanges other than the above-mentioned exchanges A and B, the above-mentioned telephone signals input from the incoming line of the exchange are detected and the status signal of the corresponding incoming line is detected during use. A method for selecting a trunk line of an exchange, comprising a step of setting.