| 摘要 |
PURPOSE:To save an operating line channel of a packet switchboard and to reduce the line installation cost by providing an interface adopting the HDLC-UN for the data link control of the interface stipulated with the CCITT recommendations X.25 to each of packet switchboards and terminal equipments. CONSTITUTION:The terminal equipment control method is constituted of hosts 1, 2, a packet exchange 3 and terminal equipments 4-9. Each of the packet switchboard 3 and the terminal equipments 4-9 has an interface changing the HDLC-BA of the data link control of the interface stipulated by the CCITT recommendations X.25 into the HDLC-UN. Terminal equipments of 500 sets need to attain text transmission/reception with the hosts 1, 2 at an optical point of time. In the case of this system, 5-set of terminal equipments are accommodated to each of line channels 10, 11 of the packet switchboard 3. Thus, the installation or lease of 100 channels of packet switchboard and 100 basic lines are enough for the accommodation of 500 packet form terminal equipments. 500 packet switchboard channels and 500 basic lines have been required for a conventional system.
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