Multiplex communications – Wide area network – Packet switching
Patent
1989-09-08
1991-04-30
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 61, 370 84, 370 941, 370 99, H04J 312, H04Q 1104
Patent
active
050124706
ABSTRACT:
A data terminal equipment which is coupled to an ISDN through an access line and uses a hierarchical protocol in conformity to an OSI reference standard model includes the following structural elements. A first data link protocol circuit provides a link access procedure balanced (LAPB) modulo-8 data link protocol. A second data link protocol circuit provides an LAPB modulo-128 data link protocol. A third data link protocol circuit provides a data link protocol based on a link access procedure for a data channel (LAPD). A protocol determining circuit determines a data link protocol to be used by referring to an address field and a control field of a cell set-up signal which is supplied from a second data terminal equipment. A data link protocol activating circuit selects and activates one of the first, second and third circuits on the basis of the result provided by the protocol determining circuit.
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Ogasawara Fumihiro
Shibata Hiroshi
Shobu Toshifumi
Hsu Alpus H.
Olms Douglas W.
Ricoh & Company, Ltd.
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