ISDN-to-ISDN communication via satellite microwave radio frequen

Details ISDN-to-ISDN communication via satellite microwave radio frequen ISDN-to-ISDN communication via satellite microwave radio frequen

1993-09-10

1995-05-02

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 99, 370 97, 455 121, H04B 7185

Patent

active

054126606

ABSTRACT:
An embodiment of the present invention includes a plurality of portable satellite terminals (PSTs) and a network control unit (NCU) in mutual communication by a communications satellite. Integrated services digital network (ISDN) basic rate interfaces (BRI) are provided at each PST and NCU such that commercially available equipment may be connected and link access procedure D-channel (LAPD) protocols are supported end-to-end. CCITT Recommendation V.42 link access procedure-modem (LAPM) with the selective frame reject option is used to carry whole LAPD frames within the information fields of LAPM frames over the satellite link. Protocol conversion units are employed at each PST and NCU to convert LAPD to LAPM and back again.

REFERENCES:
patent: 5172375 (1992-12-01), Kou
James S. Lee, "Symbiosis Between a Terrestrial-Based Integrated Services Digital Network and a Digital Satellite Network," IEEE Journal on Selected Areas in Communication, Jan. 1983.

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