Multiplex communications – Wide area network – Packet switching
Patent
1982-05-13
1985-03-12
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370104, H04J 300
Patent
active
045049440
ABSTRACT:
The present invention relates to a channel port module (16) capable of being bridged with a plurality of similar channel port modules onto a single first data rate communication line existing between a hub office (10) and a satellite earth station (12). Each channel port module is in communication with a separate sub-rate user and functions to extract the portion, or channel set, of the first data rate communication signal from the hub office destined for its associated user. Each channel port module also functions to insert a sub-rate return message onto its allocated portion of the return first data rate communication signal which is transmitted back to the hub office. The channel port modules are bridged in parallel onto the communication line, thereby achieving simultaneous reception of the first data rate signal by the plurality of channel port modules sharing the same communication line. Each channel port modules comprises a first divider (22) and a second divider (24) to extract its associated channel set from the plurality of channels included in the first data rate signal. The value associated with the first divider, L, is equal to the number of channels dedicated to each user, and the value associated with the second divider, M, is equal to the number of channel port modules bridged onto a single communication line. Thus, to obtain complete utilization of the communication signal, LM should be equal to the total number of channels on the first data rate communication signal.
REFERENCES:
patent: 3781818 (1973-12-01), Pardoe et al.
patent: 3838221 (1974-09-01), Schmidt et al.
patent: 3982077 (1976-09-01), Clark et al.
patent: 4160128 (1979-07-01), Texier
patent: 4224473 (1980-09-01), Kaul et al.
patent: 4229815 (1980-10-01), Cummiskey
IBM Technical Disclosure Bulletin; vol. 18, No. 10, "Concentrating Low-Speed Lines into a High-Speed Link"; Blanc et al., pp. 3313-3314.
AT&T Bell Laboratories
Olms Douglas W.
Pfeifle Erwin W.
Scutch III Frank M.
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