JPS5955694A - Repeating method of response signal - Google Patents

Abstract

PURPOSE:To reduce the load of an already set up exchange which corresponds to a telephone set, by providing a means supervising the polarity between output trunks and controlling the polarity of a junction line to a two-wire DC loop signal type exchange and also providing a means detecting the polarity of the junction line to a corresponding device on the originating side. CONSTITUTION:At the time of originating from an originating subscriber, a relay A is actuated by a line corresponding device A-LPREP-PUB and a relay L is actuated by a DC supplying circuit in a repeating device B-LPREP-PUB on the exchange side. Simultaneously, a relay A1 in a repeating device B-REP on the exchange AX side is also actuated. In the exchange AX, the relay D of the repeating device B-REP and the relay A of an output trunk OGT are actuated by selecting an output trunk OGT. The polarity between A and B lines of the trunk OGT is supervised by the R and D relays and the polarity of the A and B lines of the repeating line is controlled by n, nc and rv relays. In the line corresponding device A-REP, the polarity of the repeating line is detected by the L and R relays.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a response signal relay system in an automatic exchange, and more particularly to a response signal relay system in a trunk line between an exchange having a two-wire DC loop signaling system and a line compatible device.

Conventionally, general response signals and special response signals to the calling side were directly transmitted to the automatic switchboard/central control unit (CM) via the outgoing trunk (OGT), depending on the conditions of the calling side, to control the calling side.

Therefore, in cases where the capacity of public telephones and general subscriber telephones and the balance of traffic are extremely different from those of ordinary stations, when high traffic conditions occur, the capacity of the existing exchange cannot cope with the situation, and the capacity of the existing exchange is insufficient. This has the disadvantage that the load increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a response signal relay system that can reduce the load on the existing exchange by accommodating it in a master station or an adjacent station in a situation that cannot be handled by the capacity of the existing exchange.

In order to achieve the above object, the response signal relay system according to the present invention provides a two-wire DC loop signaling system exchange with a monitoring means for monitoring the polarity between the outgoing trunk lines A and B, and a relay line relay system using the monitoring means. By providing a control means for controlling the polarity between the A line and the B line, and on the other hand, providing a detection means for detecting the polarity of the trunk line in the originating line corresponding device, a general response signal and a special response signal can be detected via the trunk line. The response signal is transmitted from the exchange to the originating line corresponding device, and the detection means can distinguish between the general response signal and the special response signal.

According to the above method, the object of the present invention is fully achieved.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows line compatible equipment A-LP'f which is the object of the present invention.
1. BP-PUB and exchange side relay device B-LPR, BP
- It is a figure which shows an example of the relay connection between PUBs.

In Figure 1, when subscriber A makes a call, line compatible equipment A-
LPRBP-PUB is activated and connected to exchange side relay device B-LPREP-PUB via a trunk line.

The exchange AX connects the outgoing trunk OGT in a known manner by means of the central control unit CM and transmits the selected number of the called party (not shown).

After the exchange AX completes sending the selected number to the called subscriber, it sends a general response signal or a special response signal from the outgoing trunk OGT to the exchange AX and the exchange side relay device B-LP depending on the type of the called subscriber.
REP-PUB, line compatible device A via trunk line,
-Transmit to LPREP-PUB.

FIG. 2 is a diagram showing an embodiment of the present invention in a two-wire DC loop signaling trunk line connecting the originating line support device A-LPREP-PUB and the terminating exchange AX.

When calling subscriber A makes a call, the line compatible device A-LPREP-
In PUB (hereinafter abbreviated as A-REP), A relay,
Exchange side relay device B-LPREP-PUB (hereinafter referred to as B-
(abbreviated as REP) DC supply circuit (the A line of the relay wire is the battery,
The TJ relay is activated by the B line (ground air). Also,
The A1 relay of the relay device B-4BP on the side of the simultaneous exchange AX also operates.

At the exchange AX, the central controller CM (see Figure 1) selects the outgoing trunk OGT.
Current is supplied from the DC supply circuit of T to the relay device B-R.
The A relay of the trunk OG'I' from the D relay of the EP operates. In other words, for the line compatible device A-RBP, the trunk line, the trunk B-REP, and the outgoing trunk OGT, the A line is connected to the battery,
Line B becomes in the earth state and becomes the positive loop shown in Figure 3.

The general response signal shown in FIG. 3 and the special response signal shown in FIG. 4 are generated in a not-shown portion of the outgoing trunk OGT. In addition to the relay device B-REP, the monitoring means for monitoring the polarity between the outgoing trunk A line and B line is controlled by the N relay and the D relay.

Further, the polarity control means for the A line and B line of the relay line is controlled by an N relay, an NC relay, and an RV relay (not shown). In the line correspondence device A-REP, the means for detecting the polarity of the trunk line is performed by the L relay and the N relay. First, the relay operation in the case of a general response signal will be explained.

As mentioned above, from the outgoing trunk OGT to the line compatible device A-R
There is a positive loop ■ on the A line and B line up to EP. Third
In the figure (■), due to the operation of the CP relay (not shown) of the outgoing trunk OGT, the potential between the A line and the B line becomes 0, and the line becomes disconnected. At this time, the A relay of the outgoing trunk OGT is restored.
The D relay of the relay device B-REP is also restored, and due to the restoration of the D relay, the N relay (not shown) of the relay device B-REP is activated. In order to disconnect the DC supply circuit between the line compatible device A-REP and the relay device by the operation of this N relay, the L relay that was operating on the relay device B-REP side and the L relay that was operating on the line compatible device A-REP side. is restored, and the disconnection shown in Figure 3 (■) is relayed. At ■ in Fig. 3, the R■ relay operates by a circuit (not shown) in the outgoing trunk OGT, the A line of the outgoing trunk OGT becomes earth air, the B line becomes the battery, and in the relay device B-REP, I (IJ relay operation Relay device B-REP.

Between the line compatible devices, an RV relay is operated in a circuit within the relay device B-BEP (not shown) due to the operation of the relay device B-REP0'1B relay, and the A line of the relay line becomes earth air and the B line becomes a battery. As a result, the R9 relay of the line corresponding device A-REP operates, and the reverse loop shown in FIG. 3 is relayed.

In Fig. 3 ■, by restoring the RV relay in the outgoing trunk OGT circuit (not shown), the outgoing trunk OG
The A line of T is the battery, the B line is the earth, and the relay device B-RE
At P, the R17 relay is restored and the relay equipment BR and EP are operated by the D link.

Between line compatible equipment A and REP, when the R relay is restored, the RV relay is restored in the circuit within the equipment, and the A line of the relay line becomes the battery and the B line becomes the earth. As a result, the line compatible device A-R
The EP relay is restored, the L relay is activated, and Figure 3 ■
The forward loop shown by is relayed.

Next, a relay method of the special response signal will be explained.

Figure 4 ■ is the same as Figure 3 ■ υ, outgoing trunk OGT,
Between relay device B-R and BP, relay device B-REP, and line support device A -: a'f! The period between 3 and P is a positive loop similar to that shown in Fig. 3 (■) described above.

In Figure 4 ■, unlike the general response signal, the outgoing trunk O
GT, between relay device B-REP and relay bag @B-REP
, the connection between the line compatible device A and REP will not be in the disconnection state shown in Figure 3 (■), and the KV relay will be operated in the outgoing trunk OGT circuit (not shown), and the A line will be connected to the battery and the B line will be connected to the earth. Immediately, the A line becomes the earth, the B line becomes the battery, and the relay i[B
- By the operation of the D relay and the R relay of the REP, the relay device B-EP internal circuit NCIJ relay is operated. As a result of this NO relay operation, the A line becomes the earth and the B line becomes the battery, and in the line compatible device A-FLEP, the L relay is restored, the ■ relay is activated, and the reverse loop shown in Figure 4 (■) is relayed.

Subscriber A and line compatible device A-11 in FIG. Between EPs is relay device B-4BP and line compatible device A-R.

This circuit performs control for subscriber A after identifying the general response signal and special response signal between BPs.

As is clear from the above description, according to the present invention, by providing a response signal relay device in the trunk line between exchanges having a two-wire DC loop signal, a general response signal and a special response signal of the ELI output trunk OGT are transmitted to the originating side. It can be transmitted by relay rather than directly.

Therefore, in a state where the capacity of the exchange cannot cope with high traffic, by accommodating it in the master station or an adjacent station, it is effective to reduce the load on the exchange due to high traffic.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a relay connection between a line compatible device and a relay device to which the present invention is applied, and FIG. 2 is a diagram showing an example of a relay device, a line compatible device, and an outgoing trunk to which the response signal relay method according to the present invention is applied. FIG. 3 is a diagram showing a general response signal, and FIG. 4 is a diagram showing a special response signal. A-LPREP-PUB...Line compatible device B-LPR
EP-PUB...Exchange side relay device AX...Exchange OGT...Outgoing trunk CM...Central control unit A, AI, D, L, Rol, relay

Claims (1)

[Claims] Outgoing trunk A of the two-wire DC loop signaling exchange
A monitoring means for monitoring the polarity between the A line and the B line of the trunk line, and a control means for controlling the polarity between the A line and the B line of the trunk line by the monitoring means; By providing a detection means for detecting, the general response signal and the special response signal can be transmitted from the exchange to the originating line compatible device via the trunk line, and the general response signal and the special response signal can be distinguished by the detection means. A response signal relay method characterized by the following: