JPH1168976A - RVA transmission equipment - Google Patents

Abstract

(57) [Summary] The present invention relates to an RVA transmission device applied to an optical access system (optical transmission system) and the like which is currently being introduced worldwide, and a trunk line between an exchange and an optical transmission system is provided. An object of the present invention is to make it possible to relay an RVA from an exchange even in a case where a line is concentrated, and to save extra functions and labor / cost. In a system for accommodating subscribers in an exchange via a transmission system having a line concentrating function, an RVA device for outputting a voice announcement is provided in the exchange, and when a relay communication line of the transmission system becomes full. The voice announcement of the RVA device is transmitted from the exchange to the subscriber by using an available one of the signaling lines of the transmission system in response to a call from the subscriber. .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an RVA transmission apparatus applied to an optical access system (optical transmission system) which is currently being introduced worldwide.

[0002]

2. Description of the Related Art When a subscriber makes a telephone call, when a transmission line between exchanges is full due to a disaster or the like, an announcement to notify the subscriber of the state, for example, after the line is full and waiting, waits for a while. There is a mechanism for announcing that you should fix it. The announcement was RVA
This is called (Recorded Voice Announcement), and the contents of the announcement are recorded in advance in the exchange. FIG. 5 shows an embodiment of the basic functions of the RVA. As shown in the figure, an RVA tape storing RVA is prepared on the exchange side, and when a transmission line is blocked for a call from a subscriber, an announcement of the RVA tape is sent to the subscriber.

At present, as a means for extending the distance between an exchange and a subscriber, as shown in FIG. 6, an optical transmission system has been introduced between the exchange and the subscriber. As shown in the figure, an exchange-side optical transmission device is provided on the exchange side and a subscriber-side optical transmission device is provided on the subscriber side, and these are connected by an optical multiplex transmission line. In this case, for the number of subscriber terminals of the exchange (n-line section)
If the optical transmission system can transmit the RVA as it is, the optical transmission system can relay the RVA from the exchange using the normal voice line (bearer line) to the subscriber even if the line between the exchanges ahead is full. There is no particular problem.

In general, however, when an optical transmission system is used, the probability that all subscribers talk at the same time, that is, the call volume is 0.1 to 0.2 Erlang on average, for example, 100, depending on the area. If the optical transmission system accommodates the subscriber, the transmission capacity may be at most one fifth to one tenth thereof. Therefore, the optical transmission system does not need to have the trunk line capacity for 100 subscribers, and in order to reduce the cost, the number of trunk lines to the exchange can be 10 to 20 lines. This is called a concentrator. In this case, if the simultaneous call of the subscriber exceeds the number of trunk lines,
Calls beyond that will not be possible, and at the same time, it will not be possible to relay RVA from the exchange to the subscriber using the voice line. To solve this, the international standard ITU
In -T, the optical transmission system that accommodates the subscriber also
The VA is prepared, and when the voice line is full, it is recommended that the optical transmission system side transmit the RVA to the subscriber.

FIG. 7 shows a configuration for transmitting RVA in an optical transmission system having such a line concentrating function. As shown, in this system, the subscriber-side optical transmission device accommodates 100 subscribers, but the capacity of the trunk line is 10 lines. The RVA tape is prepared for both the exchange and the optical transmission device on the subscriber side.
For simultaneous calls within the line, use the voice line to
Although the VA is transmitted to the subscriber, the RVA of the optical transmission device on the subscriber side transmits the RVA to the subscriber at the time of simultaneous communication of 11 lines or more.

[0006]

When the RVA is provided in the subscriber side transmission device as shown in FIG. 7, the cost of the transmission system increases by the amount of the RVA function, and the installation and maintenance of the RVA are troublesome. There is a problem that costs are required.

The present invention has been made in view of such a problem, and enables an RVA to be relayed from an exchange even when a trunk line between the exchange and a transmission system is concentrated, thereby providing an extra function. And to save labor and cost.

[0008]

In order to solve the above-mentioned problems, an RVA transmission apparatus according to the present invention plays a voice announcement in a system in which a subscriber is accommodated in an exchange via a transmission system having a concentrator function. RVA device is provided in the switchboard, and when the transit communication line of the transmission system is full, an available one of the transmission lines of the transmission system is used for a call from a subscriber. The voice announcement of the RVA device is transmitted from the exchange to the subscriber.

The above-mentioned transmission system can be constituted by an optical transmission system, and the voice announcement of the RVA device is inserted into a vacant one of the signaling time slots of the trunk line of the optical transmission system. Can be configured.

[0010]

The RVA transmission apparatus of the present invention focuses on a vacant portion of a signaling line of an optical transmission system or the like, and uses this vacant portion to transmit a voice announcement of an RVA device installed on the exchange side to a subscriber. Even when an optical transmission system or the like having a line concentrating function is introduced, a voice announcement can be relayed only from the exchange side to an attendant.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an RVA transmission device for an optical access system according to an embodiment of the present invention.
In the drawing, 1 is an exchange, 2 is an optical transmission device on the exchange side, 3 is an optical transmission device on the subscriber side, and the optical transmission device 2 on the exchange side and the optical transmission device 3 on the subscriber side are connected by an optical multiplex transmission line 4. Have been.
The exchange 1 is provided with an RVA device 11 for transmitting RVA. The subscriber-side optical transmission device 3 accommodates 300 subscribers 6. The exchange 1 and the exchange-side optical transmission device 2 are connected by 1E1, that is, an interface 5 for 30 lines, and the optical multiplex transmission line 4 has a capacity of 30 lines. That is, this system has 30 trunk lines (1E1).
And the number of subscribers is 300 (concentration ratio 1:10). The optical multiplex transmission line 4 transmits and receives signals in a frame format of 32 time slots of TS0 to TS31. Of these signals, the time slots of TS15, TS16, and TS31 are used for signaling, and the remaining 29 time slots are used for signaling. The slot is for voice calls. Then, in this embodiment, when all the relay lines of the optical multiplex transmission line 4 are blocked, the RVA is performed using the vacant time slot TS31 among the signaling time slots.
The device 11 relays the RVA to the subscriber side.

The operating principle of this embodiment is as follows. At the time of concentrating, a call having a concentration higher than the concentrating ratio cannot be transmitted, and there is naturally no communication line (bearer line) for relaying RVA. Therefore, in the present embodiment, the bearer line is not used for the relay of the RVA, but the vacant portion of the signaling line used between the exchange and the optical transmission system, that is, the signaling line controlling each bearer line is used. I decided to.

In the standard interface (V5.2) with the ITU-T concentrator function, as shown in FIG. 2, the maximum number of relay lines is 16E1 (16 × 2 Mbps).
The number of simultaneous relay lines is 480. Each El has three signaling lines (ie, TS15, TS15,
TS16, TS31) are prepared separately from those for the bearer trunk line. That is, when the trunk line is 1E1 as in the present embodiment, three signaling lines and 16E
In the case of 1, there are a maximum of 48 lines.

In the case of normal telephone service relay (other than ISDN data transmission), the control procedure between the exchange and the optical transmission system is simple. It is known that only one or two signaling lines are required even at the time of full relay.
Therefore, even at the time of the minimum 1E1 relay, there is always one vacant signaling line. Therefore,
RV prepared in the exchange using the free line
A can be relayed through the optical transmission system. That is, according to the present invention, the RVA can be transmitted from the exchange to the subscriber even when the number of simultaneous calls exceeds the number of relays (30 lines) (31 lines or more).

[0015]

Next, a more specific embodiment will be described with reference to FIG. In FIG. 3, the exchange 1 is connected to an exchange side transmission device 2 of an optical transmission system via an interface 5, and in the optical transmission system, the exchange side transmission device 2 and the subscriber side transmission device 3 are connected via an optical fiber 4. The subscriber-side transmission device 3 accommodates a plurality of subscribers 6. The exchange 1 mainly includes a communication path system 12, a signal processing system 13, and a control device system 1.
The RVA device 11 is connected to the control device system 14. The communication path system 12 is a trunk line interface unit,
Includes a time division multiplexer unit and a subscriber line interface unit.
The signal processing system 13 includes a subscriber line signal device, a trunk line signal processing device, and a common line signal device. The control device system includes a subscriber line processing device, a trunk line processing device, a common line processing device, and a control device between processing devices. Further, the exchange side transmission device 2 includes an exchange interface unit, a multiplex transmission interface unit and the like, and the subscriber side transmission device 3 includes a multiplex transmission interface unit, a subscriber interface unit, and a control unit having a line collecting function.

RVA device 1 connected to control device system 14
The RVA from 1 is transmitted to the optical transmission system via the inter-processing device control device of the control device system 14, the common line processing device, the common line signal device of the signal processing right 13, and the subscriber line interface of the communication path system 12. Is done. In this optical transmission system, if there is still room in the trunk communication line, this RV
A is transmitted to the subscriber side through the vacant line, but when all the trunk communication lines are blocked, the subscriber side is transmitted through a vacant time slot (for example, time slot TS31) of the signaling line. Sent to.

The operation of this embodiment system will be described with reference to FIGS. FIG. 7 shows an operation sequence from transmission of an RVA between the exchange and the optical transmission system to termination of the RVA.

When the subscriber 6 makes a call request and the trunk line of the optical transmission system is full, the subscriber-side optical transmission device 3
Detects that the trunk line is full. At this time, the control unit transmits an RVA request to the exchange 1 using a signaling line (for example, the time slot TS31). This RVA request signal is transmitted to the exchange side optical transmission device 2.
Is transmitted to the exchange 1 via.

In the exchange 1, first, a signal is received by a communication path system 12 including a time division multiplexing device, and then, when an RVA request is confirmed by a signal processing system 13 having a common channel signal device, a control device system is provided. The RVA device 11 is activated from 14.
An RVA is transmitted from the RVA device 11 and transmitted to the subscriber through an empty signaling line (for example, the time slot TS31) by the optical transmission system in a procedure reverse to that at the time of the RVA request. Due to this operation, even in the case of concentrating, the optical transmission system does not have the RVA function,
It becomes possible to flow VA.

When the subscriber 6 terminates the call, the optical transmission system transmits the termination information to the exchange 1 via a signaling line (such as a signal relay time slot TS16). Cut 11
The RVA end is notified to the optical transmission system.

In practicing the present invention, various modifications other than those described above are possible. For example, in the above-described embodiment, if all the communication lines of the optical transmission system are blocked, the RVA is transmitted using an empty signaling time slot. Alternatively, the RVA may be transmitted using a vacant signaling time slot. In addition to the various optical transmission systems (active star and passive star) described above, PABX
And future broadband transmission systems.

[0022]

As described above, according to the present invention, even when the trunk line between the exchange and the transmission system is concentrated, it is possible to relay the RVA from the exchange, thereby providing extra functions. Labor and cost can be saved.

[Brief description of the drawings]

FIG. 1 is a diagram showing an RVA transmission device as one embodiment of the present invention.

FIG. 2 is a diagram illustrating a standard interface V5.2 with a line collecting function of the international standard ITU-T.

FIG. 3 is a diagram showing an embodiment which is a more specific configuration of the present invention.

FIG. 4 shows an operation sequence from transmitting an RVA between the exchange and the optical transmission system in the apparatus of the embodiment to ending the RVA.

FIG. 5 is a diagram for explaining an implementation form of a basic function of the RVA.

FIG. 6 is a diagram illustrating an embodiment of realizing an RVA function via an optical transmission system.

FIG. 7 is a diagram illustrating an embodiment of realizing an RVA function via an optical transmission system having a line concentrating function.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 switch 2 switch-side transmission device 3 subscriber-side transmission device 4 optical multiplex transmission line 5 interface unit 6 subscriber terminal 11 RVA device 12 communication path system 13 signal processing system 14 control system

Claims (2)

[Claims] In a system for accommodating subscribers in an exchange via a transmission system having a line concentrating function, an RVA device for transmitting a voice announcement is provided in the exchange, and a relay communication line of the transmission system becomes full. RVA transmission configured to transmit a voice announcement of the RVA device from the exchange to the subscriber using a vacant one of the signaling lines of the transmission system in response to a call from the subscriber. apparatus. 2. The transmission system according to claim 1, wherein the transmission system comprises an optical transmission system, and the voice announcement of the RVA device is inserted into a vacant one of signaling time slots of a trunk line of the optical transmission system. The RVA transmission device according to claim 1.