Multiplex communications – Wide area network – Packet switching
Patent
1988-01-29
1989-05-30
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
3701101, H04J 302
Patent
active
048357693
ABSTRACT:
An apparatus for providing passive bus communication in an ISDN without use of services of a central office includes a passive bus suitable for ISDN D-channel frame communication, the passive bus having an echo channel and having a plurality of terminal devices coupled to the passive bus. A receiving circuit is coupled to the passive bus for receiving D-channel frames containing a SAPI address transmitted from the terminal devices over the passive bus. A decoding circuit is coupled to the receiving circuit for decoding D-channel addresses transmitted from the terminal devices over the passive bus. The decoding circuit includes a circuit for determining if one of the D-channel frames from the terminal devices include a predetermined SAPI address. A switching circuit is coupled to and responsive to the decoding circuit, and implements a logical communication channel between two or more of the plurality of terminal devices when the D-channel frame includes the predetermined SAPI address. The switching circuit echoes D-channel frames over the echo channel of the passive bus for receipt by the terminal devices (TE) coupled to the passive bus and inhibits transmission of the D-channel frames to the central office when the D-channel frames include the predetermined SAPI address. The TE monitors the D-echo channel to receive the local passive bus communication in addition to contention resolution.
REFERENCES:
patent: 4390944 (1983-01-01), Quackenbush et al.
patent: 4446515 (1984-05-01), Sauer et al.
patent: 4516204 (1985-05-01), Sauer et al.
patent: 4532627 (1985-07-01), Smitt
patent: 4550402 (1985-10-01), Gable et al.
patent: 4592045 (1986-05-01), Fundneider
patent: 4592047 (1986-05-01), Fundneider
patent: 4597076 (1986-06-01), Bingham et al.
patent: 4688214 (1987-08-01), DeWitt et al.
patent: 4689788 (1987-09-01), Wurzburg et al.
patent: 4694952 (1987-09-01), Beckinger et al.
patent: 4722082 (1988-01-01), Furuya et al.
"ISDN Customer to Network Signalling D Channel Protocol Level 1 Aspects", Moore, Whall & Kerswell, 1982 IEEE, pp. 750-756.
"Phase Aligned Passive Bus (PAB) Scheme for ISDN User-Network Interface", Kuwahara, Amemiya & Murano, 1986 IEEE, pp. 1367-1372.
"Report: A Network Interface Chip for ISDN Terminals", Govind Offord & Piper, AT&T Technical Journal, 27-39.
"Considerations on Customer Access to the ISDN", IEEE Trans. on Comm., vol. COM-30, No. 9, Sep. 1982, (Waber), pp. 2131-2136.
"D-Channel Protocol: Role, Requirements, Level 2, Implications", Parodi, Romagnoli & Preti, 1982 IEEE, pp. 757-761.
"Integrated Digital Access Design for ISDN", Patel & Roddick, 1983 IEEE, pp. 1389-1395.
Donaghue, Jr. Norman J.
Jayapalan Jay P.
Salcedo Rafael E.
Miller Jerry A.
Olms Douglas W.
Racal Data Communications Inc.
Scutch III Frank M.
LandOfFree
Passive bus communication for ISDN does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Passive bus communication for ISDN, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Passive bus communication for ISDN will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2159217