JPH0787086A - Packet communication terminal adaptor - Google Patents

Abstract

PURPOSE:To accommodate lots of packet form terminal equipment by utilizing dynamically two B channels while taking a throughput class served in the packet communication mode of an integrated services digital network into account so as to improve the utilizing efficiency of an ISDN line. CONSTITUTION:The adaptor is provided with a physical interface section 2 accommodating packet form terminal equipments 1A-1P connected by the V.24/V.28/IS2110 stipulated by the CCITT whose line speed is 9.6kbps or below, a physical/electrical level conversion section 3 converting data of a layer 1 into a TTL level, an LSI section 4 for processing the X.25 in compliance with the CCITT processing packet data of the TTL level, a buffer section 5 storing tentatively the packet data to provide a packet head, a packet multiplexer section 6 multiplexing the packet data, a channel selection section 7 discriminating the communication speed of data to allocate a required B channel, a D channel call control section 8, an S/T point interface section 9 of the I.430 stipulated by the CCITT and a line connector 10 accommodating a point T interface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packet communication terminal adapter, and more particularly to a packet communication terminal adapter capable of accommodating a large number of packet type terminals.

[0002]

2. Description of the Related Art A conventional packet communication terminal adapter allocates a B channel corresponding to one or two terminals accommodated in a physical interface section as a transmission path. Then, for each channel, an X.V. 25 processing LSI part.

The CCITT-compliant V. 1
It has a function of converting to an I interface by an S / T bus interface unit through the speed conversion unit 10 and connecting to an external line connection device.

On the other hand, in Japanese Unexamined Patent Publication No. 62-149241, a telex terminal is connected to a network terminating device via a terminal adapter for a telex terminal with a PAD function to packetize the data of the telex terminal to obtain ISD.
Techniques have been shown that can be effectively transmitted using N slow D channels.

Further, in Japanese Laid-Open Patent Publication No. 1-240047, an existing terminal enables a transfer mode (circuit switching / packet switching) to be selected for each application, as in the ISDN terminal device, and a circuit switching call and a packet switching call. Is a terminal adapter that can be comprehensively multiplexed on the ISDN channel. This allows existing terminals to
Techniques for receiving services equivalent to SDN terminal devices are shown.

Further, Japanese Patent Laid-Open No. 2-67071 discloses that
In order to be used as a public ISDN terminal, it is equipped with a network terminating device, a public telephone, a public billing device, a terminal connection outlet, and a home bus for interconnecting these. With this configuration, not only a telephone as a public terminal but also a data terminal, a facsimile terminal, and the like can be connected, and therefore, a technique for expanding the ISDN service to a public terminal is disclosed.

Further, Japanese Laid-Open Patent Publication No. 2-145092 discloses an ISDN data line terminating device in which a packet type data terminal is subordinately accommodated in a circuit switching type data terminal of each channel of ISDN B1 and B2.
The channel circuit-switched data terminal DTE1 is an ISDN
Data circuit terminating device → ISDN network terminating device → Communication between the other party's B1 channel circuit-switched data terminal DTE1R via an ISDN switch to perform negotiation for dividing the communication speed of the B1 channel interface It is shown.

As a result, for example, the data of the circuit-switched data terminal DTE1 and the other party's DTE1R has 32 Kb.
When ps is assigned, the packet-type data terminal DTE2 and the packet-type data terminal D of the other party dependent on each
36 Kbps is allocated to TE2R data. Then, each ISDN data line terminating device can be notified of the result of the negotiation, the communication speed setting mode can be determined, and the operation of speed division can be started. The same applies to the B2 channel. In this way, B
Up to five terminals can be connected using channels 1, B2 and D, and the line usage efficiency can be improved.

[0009]

However, the conventional packet communication terminal adapter is 1: n to 2:
Although it is possible to carry out n packet communication, when it is necessary to accommodate a large number of terminals with a small capacity, the data is multiplexed to the maximum of the throughput class, and 1B
If the data cannot be transmitted on the channel, we could not use it to the maximum by utilizing the advantages of the storage type and the different speed communication, which are the features of packet communication, such that processing is performed using another free B channel. .

Therefore, a new ISDN line is contracted,
It is necessary to prepare terminal adapters for the number of ISDN lines, connect them, and cope with them, which causes a problem of increase in equipment amount and line cost.

Further, in Japanese Patent Laid-Open No. 2-145092, the B1 channel circuit-switched data terminal DTE1 and the other party, the B1 channel circuit-switched data terminal DTE.
After communicating with the 1R, negotiating the division of the communication speed of the B1 channel interface, notifying each ISDN data line terminating device of the result of the negotiation and setting its own communication speed setting mode. Without it, communication was not possible, and there was a problem that the maximum number of terminals could be connected to only 5 units.

The present invention solves such a problem, and an object thereof is to perform B channel selection in consideration of the maximum throughput class per 1 B channel which is serviced in the packet switching mode of ISDN. It provides a packet communication terminal adapter capable of

[0013]

SUMMARY OF THE INVENTION A packet communication terminal adapter according to the present invention is a V.T.C. specified by CCITT with a line speed of 9.6 Kbps or less. 24 / V. 28 / IS21
A physical interface unit for accommodating a plurality of packet-type terminals connected at 10, a physical / electrical level conversion unit for converting layer 1 data accommodated in the physical interface unit to a TTL level, and TTL level packet data CCITT-compliant X. 25 processing LS
I section, a buffer section for temporarily storing data for adding a packet header to the data subjected to the packet communication processing, and packet multiplexing for multiplexing packet data based on communication speed information of the packet header Section, a channel selection section that determines the communication speed of the data sent from this packet multiplexing section, and allocates the necessary B channel, a D channel protocol control section that performs ISDN call control, and a channel selection section. It has an S / T point bus interface section for converting the received B channel data into I interface data, and a line connection device section for accommodating this T point interface.

[0014]

The present invention can accommodate a large number of packet type terminals by making maximum use of efficient data transmission and packet multiplexing techniques that are aware of the throughput class of the ISDN network.

[0015]

1 is a block diagram showing an embodiment of a packet communication terminal adapter according to the present invention. In the figure, 1A to 1P are packet type terminals (hereinafter,
16 terminals are provided as an example. 2 is a physical interface unit. This physical interface unit 2 is a CC with a line speed of 9.6 Kbps or less.
Logical condition of physical interface defined by ITT V.
24, electrical conditions V.I. 28, the mechanical condition IS2110 accommodates 16 connected terminals 1A to 1P.

Reference numeral 3 is a physical / electrical level converter. The physical / electrical level converter 3 converts the layer 1 transmission data from the terminals 1A to 1P into a TTL level signal. Four
CCITT-compliant X. 25 processing LSI part. This CCITT-compliant X. 25 The processing LSI unit 4 uses this TT
Packet communication processing of L level data is performed.

Reference numeral 5 is a buffer section. This buffer section 5
Temporarily stores data in order to simultaneously add a packet header including destination data, communication speed, etc. to the data subjected to the packet communication processing. 6 is a packet multiplexing unit. The packet multiplexing unit 6 multiplexes the packet data sent. That is, based on the communication speed information of the packet header generated by the buffer unit 5, the packet is multiplexed and output.

Reference numeral 7 is a channel selection unit. The channel selection unit 7 operates so as to determine the communication speed of the data sent from the packet multiplexing unit 6 and allocate the necessary B channel. That is, the maximum throughput class 9.6 Kb provided in the packet switching mode of the integrated digital communication network is based on the multiplexed data capacity.
It is sent as 1B channel data so as not to exceed ps.

At this time, when it exceeds 9.6 Kbps, allocation control of the used channel is performed so that the remaining B channel is used for transmission. In addition, terminals 1A to 1P
When an excessive amount of data is transmitted from the device, the channel selector 7 temporarily stores the data, or discards the data and issues a re-request to the destination terminal, eg, 1P. .

Reference numeral 8 is a D channel protocol control unit.
The D channel protocol control unit 8 performs ISDN call control. Reference numeral 9 is an S / T point bus interface unit. This S / T point bus interface section 9 is an I.S.C. specified by CCITT. The S / T point interface unit 430, the details of which are the conversion of the B channel data sent from the channel selection unit 7 into the I interface data under the control of the D channel protocol control unit 8.

Reference numeral 10 is a line connection device section. This line connection device unit 10 can accommodate a T-point interface. That is, the G.C. 96
Although it supports one metallic transmission line interface, data is sent to the integrated digital communication network via this transmission line. Reference numeral 11 is a packet communication terminal adapter. The packet communication terminal adapter 11 includes a physical interface unit 2, a physical / electrical level conversion unit 3, a CCITT-compliant X. 25 processing LSI unit 4, buffer unit 5, packet multiplexing unit 6, channel selection unit 7, D channel protocol control unit 8, S / T point bus interface unit 9, and line connection device unit 10.

Next, the operation of the packet communication terminal adapter having the above configuration, in other words, the procedure for transmitting data from the terminals 1A to 1P to the integrated digital communication network side will be described. First, the physical interface unit 2 defines a logical condition V.V. of the physical interface defined by CCITT with a line speed of 9.6 Kbps or less. 24, electrical conditions V.I. 28,
16 terminals 1A connected by mechanical condition IS2110
Holds 1P.

Therefore, the data transmitted from these terminals 1A to 1P are sent to the physical / electrical level converting section 3. This physical / electrical level conversion unit 3 is a layer 1 of the terminals 1A to 1P.
Of the CCITT-compliant X. 25 to the processing LSI unit 4.
This CCITT-compliant X. 25 The processing LSI unit 4 is
The TL level data is subjected to packet communication processing, and the data subjected to the packet communication processing is output to the buffer 5.

The buffer unit 5 temporarily stores data for the packet communication processing in order to add a packet head including destination data, communication speed, etc. to the data. Then, the packet multiplexing unit 6 uses the buffer unit 5
Based on the communication speed information of the packet header generated in
In order to efficiently transmit the packet data to the ISDN line which is a transmission line, packet multiplexing is performed and the packet data is sent to the channel selection unit 7.

The channel selecting section 7 determines the communication speed of the data sent from the packet multiplexing section 6 in order to transmit the packet multiplexed data as B channel data of the integrated digital communication network. 1B serviced in packet switching mode of digital communication network
B considering the maximum throughput class per channel
Select the channel.

That is, the control for selecting the B channel is also included according to the traffic. Then, the S / T point bus interface unit 9 receives the data for 2B channels created by the channel selection unit 7, or the call control from the D channel protocol control unit 8 controls the I.D. 43
Convert to 0 interface. Then, the line connection device section 10 sends the sent data to the G.264 standard specified by CCITT. It is transmitted to the 961 metallic transmission line interface.

[0027]

As described above in detail, according to the packet communication terminal adapter of the present invention, the concept of 1 terminal 1B channel in the conventional packet communication terminal adapter can be eliminated. Moreover, by making maximum use of efficient data transmission and packet multiplexing technology that is conscious of the throughput class of the integrated digital communication network, many terminals can be used despite using the basic interface line of the integrated digital communication network. As a result, it is possible to accommodate the new equipment, and it is possible to reduce the amount of new equipment and the line cost.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a packet communication terminal adapter according to the present invention.

[Explanation of symbols]

 1A to 1P packet form terminal 2 physical interface unit 3 physical / electrical level conversion unit 4 CCITT compliant X. 25 processing LSI section 5 buffer section 6 packet multiplexing section 7 channel selection section 8 D channel protocol control section 9 S / T point bus interface section 10 line connection device section 11 packet communication terminal adapter

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[Procedure amendment]

[Submission date] June 15, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

[0013]

The packet communication terminal adapter according to the present invention is a V.T. 24 / V. 28 / IS21
A physical interface unit for accommodating a plurality of packet-type terminals connected at 10, a physical / electrical level conversion unit for converting layer 1 data accommodated in the physical interface unit to a TTL level, and TTL level packet data CCITT-compliant X. 25 processing LS
I part, a buffer part for temporarily storing data for adding a packet header to the data subjected to the packet communication processing, and packet multiplexing for multiplexing packet data based on communication speed information of the packet header Section, a channel selection section that determines the communication speed of the data sent from this packet multiplexing section, and allocates the required B channel, a D channel protocol control section that performs ISDN call control, and a channel selection section. An S / T point bus interface section for converting the received B channel data into I interface data, and a line connection device section for accommodating the T point interface are provided. Also channel selection
Based on the amount of multiplexed data, the section
The maximum throughput provided in the packet switching mode of the communication network
1B channel data so as not to exceed the output class
Is sent as. In addition, the channel selection unit
One if the amount of data exceeds the maximum throughput class
Accumulate over time, or discard data and send to
It controls the re-request to the packet form terminal of
is there.

Claims (1)

[Claims] 1. CCIT with a line speed of 9.6 Kbps or less
V. defined by T. 24 / V. 28 / IS2110, a physical interface unit that accommodates a plurality of packet type terminals, a physical / electrical level conversion unit that converts Layer 1 data accommodated in the physical interface unit to a TTL level, and a TTL level CCITT-compliant X. 25 processing LSI part, a buffer part for temporarily storing data for adding a packet header to the data subjected to the packet communication process, and packet data multiplexing based on communication speed information of the packet header A packet multiplexer, a channel selector that determines the communication speed of the data sent from the packet multiplexer, and allocates a necessary B channel, and an ISD.
A D channel protocol control unit for performing N call control, an S / T point bus interface unit for converting the B channel data sent from the channel selection unit into I interface data, and a line connection accommodating this T point interface. A packet communication terminal adapter, comprising: a device section.