JPS62122496A - Remote exchange - Google Patents

Abstract

PURPOSE:To accommodate a digital subscriber in accordance with the CCITT recommendation by connecting a communication line system device with a packet exchange through a transmission line, and controlling the data transfer to accommodate a digital subscriber that uses common channel-type signal system in a subscriber's line terminal equipment. CONSTITUTION:A subscriber's line signal controlling part B-4 has the function as a link layer terminal of D-channel, separates a data iputted from a subscriber's line terminal equipment B-1 into a call controlling information and a packet data, and writes them respectively in the buffer areas of a main memory B-8. The competition and the multoplexing of the call information to the equipment B-1 are attained by executing a transmission queuing from a processor B-7 sequentially. A common line signal controlling part B-6 and a packet data controlling part B-9 respectively has the function as a layer terminals 1 and 2 of the data link. The controlling part B-6 is used for the IPL data reception during the initializing of the system and for the transmission of a system-state information in addition to the utilization for the transmission and reception of a call controlling information to a line switch C.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to remote switching equipment for accommodating subscribers in remote areas, and in particular for accommodating digital subscribers of common channel type signaling and connecting circuit-switched networks. The present invention relates to a remote switching device having an interface with a packet switching network.

[Conventional technology]

Conventional remote switching devices exist independently, one belonging to a circuit switching network and the other belonging to a packet switching network.

An example of a conventional remote switching device in this circuit switching network is shown in FIG.
indicates a line exchange (master station).

The remote switching equipment B in this line-switched network may accommodate analog subscribers or digital subscribers. In the case of an analog subscriber, after analog/digital conversion in the subscriber circuit, multiplexing, demultiplexing, and concentrating are processed in the multiplex concentrator section n-i-i, and the line exchanger corresponding to the master station CK is sent to the terminal equipment B-12. In the normal mode in which the main station C is connected to the main station C and does not switch to standalone mode, the switching operation is performed by the master station C. At this time, the main functions of the control unit B-13 of the remote switching device B are to detect failures, notify the master station C, control system configuration switching according to instructions from the master station C, test diagnosis, and start up the system. ing. Furthermore, if voice and data are not mixed in a digital subscriber, tl is processed in the same way as in the case of an analog subscriber, except for analog/digital conversion. In the case of a digital subscriber using a field channel type signaling system that integrates voice/data, the data part is extracted between the subscriber circuit and the multiplex concentrator B-11, and CCITTII&1 is processed by the control unit B-13 of
7. There is an example where the telephone/data user section transfers the data to the master station.

That is, it is a data transfer method using a common line signal network.

In FIG. 2, att l '+2 represents a subscriber line, C represents a circuit switched call transfer path, C represents a communication path control bus, f represents a common line signal transfer path, and g represents a transmission path.

On the other hand, as a remote station in a packet-switched network, a packet multiplexer, a small-scale packet switch, or a system in which some of the functions of a packet-switching center are extended to a remote location are considered, but in any case, circuit switching Similar to remote switching equipment in a network, it is a closed system within the same network.

[Problem that the invention seeks to solve]

The conventional remote switching equipment described above exists independently in a circuit switching network and a packet switching network.

When accommodating digital subscribers using a common channel signaling system that integrates voice, data, images, etc. in a remote switching device, a circuit switching network, common channel signaling network, or packet switching network is used depending on the format of each media. There will be suitability and unsuitability for each. and l of the CCITT I series recommendations.
In the 5DN5--The Network Interface, an information channel protocol specification is defined, in which the circuit-switched call of the information channel is compatible with a circuit-switched network, and the packet data of the information channel is compatible with a packet-switched network. Further, the call control information of the signaling channel is compatible with a common channel signaling network, and the packet data portion of the signaling channel is compatible with a packet switching network. Therefore, when incorporating an 18ON network user interface into a remote switching device, it is necessary to connect it to the current circuit switching network, common line signaling network, and packet switching network in order to effectively utilize the existing network and configure the master station. There is. In short, conventional remote switching equipment configurations have the drawback of not being able to accommodate digital subscribers that comply with the CCITT Recommendations.

[Means for solving problems]

In the remote switching device of the present invention, digital subscribers of a common channel type signaling system are accommodated in a subscriber line termination device, and the control system of the remote switching device is connected to a communication path switch connected to the subscriber line termination device. means for controlling transmission and reception of subscriber line signals between the subscriber line signal control unit and the subscriber line termination device, comprising a subscriber signal control unit, a common line signal control unit, and a packet data control unit; means for controlling the transmission and reception of call control data for a circuit-switched call between the common line signal control section and the circuit exchange; and a means for controlling the transmission and reception of packet data by connecting the packet data control section and the packet exchange through a transmission path. means for controlling the transfer of subscriber line information between the subscriber line terminating device and the communication path system device, and connecting the communication path system device and the circuit exchange through a transmission path to control the transfer of circuit switched calls; and means for connecting the communication path system device and the packet switching equipment via a transmission line to control the transfer of packet data.

[Effect]

In the present invention, a subscriber line signal control unit ``F2'' that performs D channel interface processing within the remote switching device u
It acts to realize data separation, competition, and multiple transfer functions between rJM5L pull mup Satsuma 11 Koi 44H-Ka5) pl Sunishima = r Ushi 1 Summer nail fhτ.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of a remote switching device according to the present invention, and only the parts necessary for explanation are shown.

In FIG. 1, A and 1A2 are digital subscribers of the common channel signaling system, B is a remote switching device, C is a line switching device, and D is a packet switching device. , subscriber lines a1, 11 to A2
subscriber line termination device &B-1 connected through subscriber line termination device B-1, and communication line system device B- connected to this subscriber line termination device B-1.
2, the terminal station device B-3 connected to this communication line system device In-2, and these subscriber line terminal equipment [8-1, communication path system device B-2゜terminal station device B-3] Subscriber line signal control unit B-41 installed in the control system to control communication path control unit B
-5, common line signal control unit B-6, and processor B-7.
It is composed of a main memory B-8 and a packet data control section B-9.

The subscriber line signal control unit B-4 and the subscriber line termination device B-1 are configured to control the transmission and reception of subscriber line signals through the subscriber line signal channel dH+d2, and
It is configured to control transmission and reception of call control data for a circuit switched call between the common channel signal control unit B-6 and the circuit exchange C via a common channel signal transfer path f.

Further, the packet data control unit B-9 and the packet switching equipment are connected via a transmission path j, and are configured to control the transmission and reception of packet data. Subscriber line information channel b1. b
2 controls the transfer of subscriber line information, connects the communication path system device B-2 and the circuit exchange C via a transmission path g, and controls the transfer of circuit switched calls; B-2 and the packet switch are connected through a transmission path t, and are configured to control the transfer of packet data.

In FIG. 1, C and k are circuit-switched call transfer paths between communication line equipment B-2 and terminal equipment B-3;
- is the communication path control bus between the communication path system device B-2 and the communication path control unit B-5, h is the subscriber line signal control unit B-49, communication path control unit B-5, common line signal control unit B- 6, Processor B-
7. Main memory B-8 and packet data control unit B-9
The processor path connected to , i indicates a transmission path.

Next, the operation of the embodiment shown in FIG. 1 will be explained.

First, in normal operation mode, processing for layer 73 and above regarding call control information or packet data is performed by circuit switch C and packet switch, respectively, and remote switching device B only needs to perform processing for layers 1 and 2. .

Therefore, within this remote switching device B, there is a subscriber line signal control section B-4 that performs D channel interface processing, a common line signal control section B-6, and a packet data control section B-4.
Data separation and conflict between 9.

Realizes multiple transfer function.

Subscriber line signal control unit B-4 of these various control units
1 communication path control section B-5, common line signal control section B-6. Packet data control unit B-9 and processor B-7. The main memory B-8 is connected to the main memory B-8 by a huff processor path h, and the processing capacity of the control system is determined by the data transfer speed between each data link.
4, the common line signal control section B-6, and the packet data control section B-9 may also have a DMA function.

Next, subscriber line signal control section B-4. When the common line signal control unit B-6 receives the data, the common line signal control unit B-6 stores the data in the call control data buffer or packet buffer of the main memory B-8, and then interrupts the processor B-7 to receive the data. Perform queue takeover. and,
Processor B-7 processes these data at "H level" and writes the data into the transmission queue to each data link control section. Here, when there is a temporary increase in packet data or traffic volume that requires data storage, this data is temporarily stored in a spare memory (not shown), and the processor B-7 processes it at the 1L level to handle fluctuations in traffic volume. Absorb.

The subscriber line signal control unit B-4 has a function as a D channel link layer termination, and also separates the data input from the subscriber line termination equipment ff1B-1 into call control information and packet data. , respectively main memory B-8
write to the buffer area. In addition, subscriber line termination equipment B
-1, the competition and multiplexing of call control information for Processor B
This is achieved by sequentially executing the transmit queues from -7 onwards.

Further, the common line signal control section B-6 and the packet data control section B-9 have functions as layer 1 and layer 2 terminations of the data link, respectively. In addition to transmitting and receiving call control information to and from the line exchange C, this common line signal control section B-6 is also used to receive IPL data at the time of system start-up, and to transmit system status information.

Thus, digital subscribers compliant with CCITT recommendations can be accommodated.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to accommodate digital subscribers using the common channel type signaling system in the subscriber line terminal equipment, and to accommodate digital subscribers that comply with the CCITT recommendations. The effect is extremely large.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a remote switching device according to the present invention, and FIG. 2 is a block diagram showing an example of a conventional remote switching device. A1+AZ...Digital subscriber) B...@Shi remote switching equipment, B-1...Subscriber line termination equipment, B-2-...
Voice/communication line equipment, B-3-/Fist/terminal equipment, B-4-
---Subscriber line signal control section, B-5, Fist/communication path control section, B-6...Fist, common line signal control section, B-7...
Processor, B-8-...Main memory, B-9...ψ-
Packet data control unit, C... circuit switch, D...
...Packet switch.

Claims (1)

[Claims] A digital subscriber using a common channel type signaling system is accommodated in a subscriber line termination device, and after multiple concentrating by a communication path system device connected to this subscriber line termination device, the subscriber line is connected to a circuit exchange via a PCM transmission path. In the remote switching device, a control system of the remote switching device includes a subscriber line signal control section, a common line signal control section, and a packet data control section, and a connection between the subscriber line signal control section and the subscriber line termination device is provided. means for controlling the transmission and reception of subscriber line signals between the common line signal control section and the circuit exchange; means for controlling the transmission and reception of call control data for circuit switched calls between the common line signal control section and the circuit exchange; means connected via a transmission line to control transmission and reception of packet data; and means for controlling transfer of subscriber line information between the subscriber line termination device and the communication line system device, and between the communication line system device and the line exchange. and a means for connecting the communication path system device and the packet switching equipment via a transmission line to control the transfer of circuit switched calls, and a means for connecting the communication line system device and the packet switch via a transmission line to control the transfer of packet data. remote switching equipment.