Multiplex communications – Wide area network – Packet switching
Patent
1992-03-12
1994-07-12
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
379246, H04Q 1104
Patent
active
053295269
ABSTRACT:
A trunk line identification system includes a line switch part connected to each of a plurality of channels of a transmission line, channel processing parts for processing signals received from and transmitted to the transmission line via the line switch part, where the channel processing parts are provided with respect to each of the channels and include first and second parts, and a switching system for switching signals. When relaying a signal received by a first channel processing part from the transmission line via the line switch part to the transmission line via the switching system and a second channel processing part, the first part of the second channel processing part transmits an identification signal to the first channel processing part via the switching system, and the second part of the first channel processing part judges whether or not a line being used is a trunk line based on whether or not the identification signal is detected.
REFERENCES:
patent: 4039758 (1977-08-01), Shiyasu et al.
patent: 4090034 (1978-05-01), Moylan
patent: 4277649 (1981-07-01), Sheinbein
patent: 4759049 (1988-07-01), Mangini
patent: 4885780 (1989-12-01), Gopal et al.
Patent Abstracts of Japan, vol. 10, No. 133 (E-404) May 17, 1986 & JP-A-60 263 555 (Nippon Denshin Denwa Kosha) Dec. 27, 1985, Abstract.
Patent Abstracts of Japan, vol. 12, No. 440 (E-684) Nov. 18, 1988 & JP-A-63 172 555 (NEC) Jul. 16, 1988, Abstract.
Murata Shigeru
Nagakura Kaoru
Fujitsu Limited
Olms Douglas W.
Patel Ajit
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