Multiplex communications – Wide area network – Packet switching
Patent
1990-10-18
1993-01-26
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 60, 370 79, H04J 312
Patent
active
051827484
ABSTRACT:
An X.25 protocol apparatus can communicate with another X.25 apparatus or a X.32 apparatus through a telephone network, an ISDN network, or a PBX network, by attaching protocol conversion system to the X.25 apparatus. The conversion system has a pair of signal identification portions (1, 6) for separating a receive packet to a data packet and a control packet, a call process portion (3, 12) for dial signal process, and an address table (4) and a packet edition portion (5) for address conversion of a control packet. A data packet is forwarded from one signal identification portion to another signal identification portion through direct path (53). A control packet is forwarded to a control packet identification portion (2) for control process which includes dial signal process, address conversion, and protocol sequences. This system is applicable to couple a data communication network which has a X.32 correspondence portion to another data communication network.
REFERENCES:
patent: 4908821 (1990-03-01), Sirato
patent: 4947388 (1990-08-01), Kuwahara et al.
patent: 4975906 (1990-12-01), Takiyasu et al.
patent: 4975910 (1990-12-01), Onder
patent: 5086426 (1992-02-01), Tsukakoshi et al.
"Interface Between Data Terminal Equipment (DTE) and Data Circuit-Terminating Equipment (DCE) for Terminals Operating in the Packet Mode and Accessing a Packet Switched Public Data Network Through a Public Switched Telephone Network or an Integrated Services Digital Network or a Circuit Switched Public Data Network", Fascicle VIII.2--Rec. X.32, (Malaga-Torremolinos, 1984, amended at Melbourne, 1988).
"Interface Between Data Terminal Equipment (DTE) and Data Circuit-Terminating Equipment (DCE) for Terminals Operating in the Packet Mode and Connected to Public Data Networks by Dedicated Circuit", Fascicle VIII.22--Rec. X.25, (Geneva, 1976; amended at Geneva, 1980, Malaga-Torremolinos, 1984 and Melbourne 1988).
Ito Yasuo
Ochiai Kunio
Sakata Shigekazu
Yamagata Hisao
Blum Russell W.
Kokusai Denshin Denwa Co. Ltd.
Olms Douglas W.
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