JPH0435437A - Packet communication device - Google Patents

Abstract

PURPOSE:To execute packet communication using a D-channel by deciding a packet information processing means which executes the processing of a packet where an identifier is included in accordance with the identification result of an identification means and providing a processing distribution means distributing the processing. CONSTITUTION:ISDN extension interfaces 6 and 7 and an ISDN office interface 8 separate/multiplex information on an information channel (B-channel) and information on a control channel (D-channel). Thus, the ISDN extension interfaces 6 and 7 and the ISDN office interface 8 execute the processing to a layer 2 in LAPD control for packet communication and a packet handler 3 being the other exchange function executes the processing of the D-channel packet of a layer 3. Thus, the buffer capacitance of the interface and the load of the processing are prevented from increasing. Thus, packet communication using the D-channel can be executed with allowance.

Description

[Detailed description of the invention] [A field of use in business]

The present invention relates to a packet communication device in ISDN that includes at least two packet information processing means.

[Conventional technology]

FIG. 3 shows a conceptual diagram of a conventional switch supporting packet A communications. In Figure 3, 51.52 is CCITT Recommendation X, 25
The packet terminal 53 is a packet handler (53) for communicating with other packet terminals via the digital line 58 connected to the ISDN packet network 100 as needed.
PHM). 54 is a time division switch, 55 is a main control unit that controls the overall control shown in FIG. 3, and 56 is a telephone line network 57 (
59.60 is an interface (1/F) that controls the interface with the packet terminal. In the above configuration, for example, from the packet terminal 51
The transmitted packet is placed on the highway inside the exchange via F59. This transmission packet is sent as a layer 2 signal from the time division switch 54 to the packet handler 53, and is sent to the IS via the digital line 58 under the control of the main controller 55.
The data is sent to a desired destination terminal connected to the DN packet network 100. Here, for example, the transmitting packet terminal is the self-time division switch 5.
4, the packet is exchanged from the packet handler 53 to the packet terminal 52 via the time division switch 54.

[Problem to be solved by the invention]

However, in conventional ISDN, packet communication using the D channel, which is a control channel, is not provided. Packet communication using D channel is protocol only C]
TT Recommendation X, 31. Q, 93. It was only determined by X, 25, etc. Conventionally, when trying to perform packet communication,
In ISDN, the control channel includes D
It has channel packets, and the circuit switching processing function section has a packet handler function and performs switching processing on all layer 3 signals, and one circuit switching processing function section serves both circuit switching processing and packet switching processing. As a result, the load on the circuit switching processing function section has increased.

[Means to solve the problem]

The present invention was made for the purpose of solving the above-mentioned problems, and includes the following configuration as one means for solving the above-mentioned problems. That is, an ISD with layer 1 and layer 2 processing functions.
an N-line interface means, an exchange means for exchanging layer 3 information of a packet control procedure, an identification means for identifying service access point identifier information in a packet on an ISDN D channel, and an identification means for identifying the service access point identifier information in accordance with an identification result of the identification means. at least two packet information processing means for processing a packet containing the identifier, and determining the packet information processing means for processing the packet containing the identifier according to the identification result of the identification means and allocating the processing. The processing allocation for dividing includes a means.

[Function] In the above configuration, the processing distribution means executes the layer 1 and layer 2 processing by the ISDN line interface means according to the information of the service access point identifier, and the layer 3 processing is performed by at least two packet information processing means. This enables packet communication using the D channel. Embodiment Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the concept of an embodiment according to the present invention. In FIG. 1, 1 and 2 are ISDN terminals with a D channel packet function, and 3 is an ISDN station line interface 8 connected to the ISDN packet network 100 as required.
4 is a time division switch for circuit switching, 5 is a main control unit that controls the overall control, and 6 and 7 are ISDN extension interfaces. Yes, separating information and control channels. 8 is an ISDN office line interface, and 9 is an ISD connected to the ISDN packet network 100.
This is N line. ISDN extension interface 6.7 and IS of this embodiment
In the DN office line interface 8, the information channel (
B channel) information and control channel (D channel) information are separated/multiplexed. Call control procedure information with the main control unit 5 is communicated using the control channel 12. Normally, in order to support ISDN, layer 2 L
The APD (CCIT Q, 921) protocol is essential and usually supports layer 2 and layer 3 call control information. However, in this embodiment, since the ISDN extension line interface 6.7 and the ISDN office line interface 8 separate/multiplex the information channel (B channel) information and the control channel (D channel) information, the ISDN Extension interface 6.7 and I
The SDN station line interface 8 is L for packet communication.
Processing up to layer 2 in APD control is performed, and processing of layer 3 D channel packets is performed by a packet handler 3, which is another switching function, so as not to increase the buffer capacity of the interface or the processing load. Regarding communication control with the ISDN station line 9, as described in CCITT Recommendation It will be done. For this reason, it is not possible to allocate processing in each of the above-mentioned configurations only based on the value of the service access point identifier (hereinafter referred to as rsAPIJ). However, except for incoming calls, 5 APIs
If is “0”, it is a call control procedure, and SAP I is “0”.
16H", it can be determined that it is a packet control procedure. Therefore, in this embodiment, focusing on the above points, SAP I
When is “0”, data is sent to the main control unit 5 and SAP
When I is "16H", the packet is controlled to be sent to the packet handler 3, thereby controlling to distribute the processing of each layer. By adopting such a distribution method, the load on the interface side is small, and protocol control below layer 2 can be executed on the ISDN interface (6 to 8), while layer 3 protocol control can be performed on the ISDN interface (6 to 8). D channel packet data etc. can be reliably sent to the packet handler 3, and packet communication using the D channel, which is a control channel, can be realized. FIG. 2 shows the protocol between the ISDN% line 9, the extension interface 6.7, the main control unit 5, and the packet handler module 3, and the allocation status of signal transfer destinations according to the 5API in this embodiment. As shown in Figure 2, first, the L of ISDN interface 8
The APD checks whether the SAP I of the packet on the D channel from ISDN 8 Masen 9 is "0" or "16H", and if 5 API is "O", it is a call control unit procedure,
The packet is transferred to the main control unit 5 and predetermined packet exchange is performed. If SAP I is "16H", it is determined that this is a packet control procedure, and the packet is transferred to the packet handler 3 for predetermined packet exchange. In the embodiment described above, the main control unit 5 and the packet handler 3 use a common bus, but a configuration using different buses is naturally within the scope of the present invention, and is also applicable to multi-CPU systems. It is clear that the scope of the present invention also includes communication using a dual port RAM such as that used in . As explained above, the main control unit 4 and the packet handler 3
By separating this as an exchange function, the load on the main control unit 4 during packet data communication can be extremely reduced, and unnecessary mutual communication can be reduced, which is highly effective. Therefore, it is possible to obtain a remarkable effect of enabling packet communication using not only an information channel but also a control channel.

【Effect of the invention】

As explained above, according to the present invention, the process allocation means executes the layer 1 and layer 2 processes by the ISDN line interface means according to the information of the service access point identifier, and the layer 3 process uses at least two pieces of packet information. By distributing D to be processed by processing means,
Packet communication using the channel can be made possible with ample margin.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the concept of an embodiment according to the present invention, and FIG. 2 shows the protocol and S
FIG. 3 is a block diagram of a switch that supports conventional packet communication. In the figure, 1, 2...ISDN terminal, 3...Packet handler (PHMD), 4.54...Time division switch,
5.55... Main control unit, 6, 7... ISDN extension line interface, 8... ISDN office line interface,
9...ISDN line, 51.52...Packet terminal, 53...Packet handler (PHM), 56...
- Telephone, 57...Telephone line network, 59.60...Interface (I/F). Patent applicant Canon Co., Ltd. - τniney agent Patent attorney Yasunori Otsuka (and 1 other person)

Claims (1)

[Claims] ISDN line interface means having layer 1 and layer 2 processing functions, and layer 3 of packet control procedure.
an exchange means for exchanging information; an identification means for identifying service access point identifier information in a packet on an ISDN D channel; and processing a packet containing the identifier according to an identification result of the identification means. at least two packet information processing means, and processing distribution means for determining and distributing processing to the packet information processing means that processes the packet containing the identifier, according to the identification result of the identification means. The processing distribution means distributes layer 1 and layer 2 processing to be executed by the ISDN line interface means and layer 3 processing to be processed by the at least two packet information processing means according to the information of the service access point identifier. Characteristic packet communication device.