JPS62114355A - Communication adapter - Google Patents

Abstract

PURPOSE:To handle two kinds of networks unitarily in the terminal side by using idle logical channel numbers to assign two kinds of network control mechanisms to respective channel numbers. CONSTITUTION:Reception data 11 of a circuit switching network 3 passes a physical layer control part 10 for circuit switching network, a data link layer control part 8 for circuit switching network connected to a line buffer memory part 9 for circuit switching network, a network layer control part 7 for circuit switching network, etc., in a communication adapter 2 and passes a data multiplexing/demultiplexing control part 6 to become facsimile data 5. Similarly, reception data 16 of a packet switching network 4 becomes data 5 also. An idle channel of logical channel numbers of the packet terminal is used to assign the control mechanism part for circuit switching network out of control mechanism parts for circuit switching network and packet switching network which are stored in one adapter 2. Thus, two networks are handled unitarily in a digital facsimile equipment 1 of the terminal in accordance with selection of logical channel numbers.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a network connection control method, and in particular, the present invention relates to a method for controlling network connections, and in particular, a method for controlling two different networks, a circuit switching network and a packet switching network, in a unified manner from the viewpoint of a data terminal device such as a digital facsimile. This invention relates to a communication adapter that makes it possible to handle

[Conventional technology]

Conventionally, facsimile terminals and the like connected to a digital switching network have had to be configured individually depending on whether the network is a circuit switching network or a packet switching network. Each net is
Speed and capacity of data handled.

Two types of terminal devices were needed to construct a network system that had contradictory characteristics and each had its own characteristics.

[Problem that the invention seeks to solve]

As mentioned above, the types of data handled by circuit-switched networks and packet-switched networks are contradictory due to the nature of the networks5.
For example, in the past, facsimile communications required real-time performance, requiring several hundred kilobytes of data to be generated and transferred in a few seconds.

Such terminals are suitable for single-circuit switched networks. However, in circuit-switched networks, logical multiplex communication is impossible because there is no concept of logical channels.

On the other hand, when incorporating a facsimile terminal as one terminal in a high-value-added network system and not only transferring facsimile data end-to-end within the system, but also performing e-mail-like management and processing operations, it is not always necessary to Real-time performance is not the top priority, and efficient operation of the line becomes a problem. In such a case, a packet switching network capable of logical multiplex communication is suitable. Thus, the existence of two networks has the disadvantage that 28 types of facsimile machines must be prepared.

[Means for solving problems]

The present invention has two network control mechanisms, a line-switched network f[i control mechanism and a packet-switched network control mechanism, in one adapter, and each network control mechanism has its own line logical channel. Have a number. On the other hand, the terminal that connects to the network through this adapter is a packet network compatible terminal,
One of the available logical channel numbers used when accessing the packet network is allocated to the switching network control unit when accommodated in the adapter. As a result, from the terminal's perspective, the adapter appears to be a single packet network, but logically, the data passed to the circuit switching network control mechanism and the packet By distributing the data to the switching network control mechanism, 2.
[Example] Next, an example of the present invention will be described with reference to the drawings. explain.

The figure is a system block diagram showing one embodiment of the present invention.

Device 1 is a digital facsimile terminal, 2 is an adapter network, 3 is a line switching network, and 4 is a packet switching network.

Facsimile data 5 from device 1 complies with CCITT recommendation X
It has a packet structure compliant with 25. Each packet of packet data has a logical channel number (identification number) for logical multiplexing. The use of logical channel numbers for packets is determined by the contract with the network, but in this adapter, one of the unused logical channel numbers between the network and the facsimile machine is allocated to the entire circuit switching network control unit. In the figure, 6 indicates multiplexing/splitting of packet data by logical channel number 5
It controls the distribution of packet data with logical channel numbers for the circuit switching network control mechanism and data with other numbers.

In the figure, the circuit switching network control mechanism section is the network layer control section 7. Data link layer control unit 81 line breadcrumb memory unit 9. Hosted by the physical layer control unit 10 21-
, the packet switching network control unit is network layer control unit 1
2. Data re/creation/f-system both parts 132 line backup memory part 14. Physical layer + ff control unit 15! ll configured. With these, data 5 is Taniamiyama I
The data distributed to the H11 machine 91 section and passed to the circuit switching network is processed by the network layer control section 7, which removes the header of the packet tights, adds a circuit switching type header to the data, and sends it out as circuit switching data 11. be done. Further, the data passed to the packet switching network is sent out as packet switching data 16 without any processing.

On the other hand, at the time of reception, the process 17 opposite to the above is performed and the data from each set is passed to the facsimile machine 1.

〔Effect of the invention〕

As explained above, the present invention utilizes one of the lower logical channel numbers of a packet terminal and accommodates a circuit-switched network and a network control mechanism section of the packet-switched network in one adapter. By assigning it to the circuit switching network control mechanism section, the terminal can handle two networks, the circuit switching network and the packet switching network, in an integrated manner by selecting a logical channel number.

[Brief explanation of drawings]

The figure is a block diagram showing an embodiment of the present invention. 1...Digital facsimile device, 2...
...Communication adapter, 3...Line switching network, 4...
... Packet switching network, 5 ... Facsimile data, 6 ... Data multiplexing/division control section, 7.
... Western network layer control unit for line conversion network, 8
・・・・・・Data link layer control unit for circuit switched network,
9... Line backup memory section for line switching network, 1
0...Physical layer control unit for circuit switching network,
11... Transmission and reception data for circuit switched network, 12...
...Network layer control unit for packet switching network, 1
3...Data link layer control unit for packet switching network, 14...Line buffer memory unit for packet switching network, 15...Physical layer control unit for packet switching network, 16 ...Transmission and reception data for packet switching network.

Claims (1)

[Claims] Means for allocating a unique logical channel number to each of the circuit switching network control mechanism, the packet switching network control mechanism, and the two network control mechanisms, and selecting the two network control mechanisms by selecting the logical channel number. and a communication adapter.