JPH033451A - Isdn packet switching system - Google Patents

Abstract

PURPOSE:To set the overall memory capacity of a packet exchange to a proper value by selecting and connecting a packet switch-board in a class adapted to a maximum number of simultaneous connectable calls read out from a data base of subscriber data preliminarily registered in a line exchange. CONSTITUTION:Plural kinds of packet switchboard 9 and 10 which are divided into classes by the maximum number of simultaneous connectable packet calls set on a channel 3 and have memory capacities corresponding to these classes are provided in a packet exchange 8 provided after a line exchange 4. When being called by subscriber terminals 3 and 17, the line exchange 4 reads out the maximum number of simultaneous connectable calls of each ISND subscriber line to be connected from a preliminarily registered data base 7 of subscriber data and selects and connects the packet switchboard 9 or 10 in the class adapted to this maximum number. Thus, the overall memory capacity of the packet exchange is set to a proper value.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an ISDN packet switching system, and particularly to a plurality of types of packet calls that are classified into classes based on the maximum number of simultaneously connectable packet calls set on a B channel. The present invention relates to an ISDN packet switching system having a packet switching device.

[Conventional technology]

Conventionally, until the ISDN packet switching system was put into practical use, circuit switching equipment and packet switching equipment were not connected to each other, and were designed and installed independently without any relation to each other. However, with the recent development of digital technology, the digitalization of networks has led to economicalization of networks and high-quality communication (digital 1 link).
The digital integrated network concept was launched with the aim of providing services, and this has further evolved into the ISDN concept, which aims to integrate services. ISDN aims to integrate individual digital communication networks and provide various services in a unified manner.
The construction of CCIT is now a global issue, and
Standardization is also being considered in T. Based on the CCITT recommendations, 2 B+D (B: 6
Digitalization of subscriber lines using a basic access ISDN user interface system with a channel structure of 4 kbit/s and D: 16 kbit/s is taking shape. In this case, the switching method uses the B channel to provide circuit switching services and packet switching services, and the D channel to provide signal control and low-speed packet switching services between the network and the terminal. There must be.

In other words, the ISDN packet switching system must be able to handle circuit switching services and packet switching services in an integrated manner, and in order to achieve this, it is currently necessary to accommodate subscriber terminals in existing circuit switching equipment. However, for packet switching services using the B channel, a packet switch is installed after the circuit switch, and the B channel on the time-division communication path is connected to the packet switch.

[Problem to be solved by the invention]

In the conventional ISDN packet switching system described above, subscriber terminals are accommodated in an existing circuit switch, and for packet switching services using the B channel, a packet switch is installed after the circuit switch, and the subscriber terminals are installed in an existing line switch. The B channel is connected to a packet switch. However, since the circuit switching equipment has no effect on its own operation during this connection operation, it only needs to determine whether a packet switching service call has been made, and it will determine whether the packet call is on the B channel, how many simultaneous connections the packet call is No consideration is given to the unique characteristics of packet calls, such as the number of calls.

On the other hand, packet switching equipment performs packet switching by installing multiple packet switching devices that can accommodate from several boats to several tens of boats, but as the number of simultaneously connected calls increases, the memory of each packet switching device also increases. That much is needed. Therefore, when a circuit switch connects a B channel on a time-division communication path to a packet switch without being aware of the number of simultaneously connected packet calls, the packet switch actually considers the number of simultaneously connected calls on the B channel to be connected to the packet switch. The circuit was designed assuming that subscriber terminals with a large number of simultaneous calls are connected to all ports of all packet switching equipment, although the number of calls varies from a few calls to several thousand calls for each subscriber. The problem is that it requires a large amount of memory and is uneconomical.

An object of the present invention is to classify packet calls set on the B channel into classes based on the maximum number of simultaneous connectable packet calls in a packet switch installed after a circuit switch, and to create a plurality of packet calls having a memory amount corresponding to the class. A circuit switching equipment that receives a call from a subscriber terminal reads out the maximum number of simultaneous connections for each connected ISDN subscriber line from a pre-registered subscriber data database.
By selecting and connecting packet switching equipment of a class that matches the maximum number of connections that can be made at the same time, it is an economically superior ISDN that keeps the total memory amount of the packet switching equipment at an appropriate value.
The purpose is to provide a baguette exchange method.

[Means to solve the problem]

The ISDN packet switching method of the present invention includes a plurality of 2B+
Basic access to the channel structure of D: I SD, which connects a circuit switch capable of handling SDN user interface calls to a packet switch that constitutes a packet switching network.
In the N packet switching system, the packet switching equipment classifies packet calls set on each B channel according to the maximum number of simultaneously connectable packet calls, and has a plurality of types of packet switching equipment each having a memory amount corresponding to the class. , the circuit switching equipment has a subscriber data database in which the maximum number of packet calls that can be simultaneously connected is registered in advance for each connected ISDN subscriber line, and the maximum number of packet calls read from the subscriber data database for each incoming and outgoing call. and means for connecting to a number of packet switching devices belonging to the above class that can be connected simultaneously.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

A packet multiplexer 2 concentrating a host computer 1 and a plurality of packet terminals 17 and a single packet terminal 3 are as follows:
Each is housed in the line exchange 4 as an ISDN subscriber terminal. The line exchange 4 has a line control processor 5
and a time-division switch 6, and a subscriber data database 7 that stores information regarding accommodated subscriber terminals (throughput class, number of concurrently connected calls (9 billing data), etc.). packet switch 8
includes a plurality of large-capacity packet switching devices 9 and a plurality of small-capacity packet switching devices 10. The large-capacity packet switching device 9 includes a layer 2 termination device 12 which is an interface device with the line switching device 4 and other packet switching devices not shown, and a central processing unit (hereinafter referred to as CPU) 13 which performs layer 3 processing. , and a memory 14 used by the CPU 13 to temporarily store packet data, call processing information, and the like. Small capacity packet switching device 10
A layer 2 termination device 12 which is an interface device with the circuit switch 4 and other packet switches not shown, a CPU 15 that performs layer 3 processing, and a CPU
15 includes a memory 16 used for temporarily storing packet data, call processing information, etc. In this case, the CPU 13 has a higher processing capacity than the CPU 15 so that it can control a larger number of calls, and the memory 14 also has a larger capacity than the memory 16 so that it can handle a larger number of calls. An inter-processor bus 11 is provided between the CPU 13 of the large-capacity packet switching device 9 and the CPU 15 of the small-capacity packet switching device 10, and transfer of call control information and data packets is necessary between the CPU 13 and the CPU 15. Used when

Next, the operation will be explained.

When the line control processor 5 receives a call request from one of the I SDN subscriber terminals, the line control processor 5
The subscriber data database 7 is searched using the SDN subscriber line as an index, and the I that made the call
Check the maximum number of SDN subscriber terminals that can be connected simultaneously, and check whether it is connected to the host computer 1 or multiple packet terminals 1.
When it is determined that there is a possibility of connecting many packet calls at the same time, such as the packet multiplexing device 2 that concentrates the
If it is determined that only a small number of packet calls are desired to be connected at the same time, such as with a single packet terminal 3, the layer 2 termination device 12 of the small-capacity packet switching device 10 is selected and connected. , controls the time division switch 6.

Conversely, in the case of an incoming call to an ISDN subscriber terminal, for example, if the large-capacity packet switching device 9 receives the call, the large-capacity packet switching device 9
The line control processor 5 of the line exchange 4 is notified of the address of the called party via the .

The control processor 5 receives the I address of the incoming call request.
Using the SDN subscriber line as an index, the subscriber data database 7 is searched to determine the maximum number of simultaneously connectable ISDN subscriber terminals at the called destination. As a result, if the maximum number of simultaneous connections is large, the layer 2 termination device 12 of the large-capacity packet switching device 9 is selected, and if it is small, the layer 2 termination device 12 of the small-capacity packet switching device 10 is selected. It is connected to the 15DN subscriber line via a time division switch 6. At this time, if the small-capacity packet switching device 10 is selected as the called side, the packet data from the calling side is sent to the large-capacity packet switching device 9. It will not be possible to send or receive packets.In this case, the CPU 13 and the
Data packets are transferred to and from U 15 via interprocessor bus 11. In this example, from large capacity packet switching device 9 to small capacity packet switching device 10 . Although the case in which a call is received from the small-capacity packet switching device 10 to the large-capacity packet switching device 9 has been described, even if the call arrives from the small-capacity packet switching device 10 to the large-capacity packet switching device 9, it will be processed in exactly the same manner.

In other words, in this embodiment, ISDN subscriber lines with a large maximum number of simultaneous connections are always connected to the large-capacity bucket switching equipment 9.
ISDN subscriber lines that are connected to the network and have a small maximum number of simultaneous connections are controlled to always connect to the small-capacity packet switching device 10.

〔Effect of the invention〕

As explained above, the present invention classifies packet calls set on the B channel into classes based on the maximum number of simultaneous connectable packet calls in the packet switch installed after the line switch, and the amount of memory corresponding to this class. A circuit switch that receives a call from a subscriber terminal uses subscriber data and registers in advance the maximum number of simultaneous connections for each ISDN subscriber line to be connected. By reading from the database, selecting and connecting the packet switching device of the class that matches the maximum number of connections that can be made simultaneously, the total memory amount of the packet switching device can be set to an appropriate value, and an economically superior ISDN packet switching system can be realized. There are effects that can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention. 1...Host computer, 2...Packet multiplexer, 3, 17...Packet terminal,
4... Line exchanger, 5... Line control processor, 6... Time division switch, 7...
...Subscriber data database, 8...Packet switching equipment, 9...Daiyo packet switching equipment,
10... Small capacity packet switching device, 11...
... inter-processor bus, 12 ... layer 2
Terminal device, 13.15...Central processing unit (CP)
U), 14.16... Memory.

Claims (1)

[Claims] Basic access I for multiple 2B+D channel structures
In the ISDN packet switching system, which connects a circuit switch capable of processing SDN user interface calls to a packet switch that constitutes a packet switching network, the packet switch is divided into classes based on the maximum number of packet calls that can be connected simultaneously on each B channel. The line switching equipment has a plurality of types of packet switching equipment having memory amounts corresponding to the classes, and the line switching equipment registers in advance the maximum number of packet calls that can be simultaneously connected for each ISDN subscriber line to be connected. An ISDN packet switching system characterized by comprising: a subscriber data database; and means for connecting to the packet switching devices belonging to the class of the maximum number of simultaneous connections read from the subscriber data database for each outgoing/incoming call.