Multiplex communications – Wide area network – Packet switching
Patent
1978-05-31
1980-09-23
Morrison, Malcolm A.
Multiplex communications
Wide area network
Packet switching
370102, H04J 306
Patent
active
042244730
ABSTRACT:
A TDMA multiplexer-demultiplexer includes a plurality of input/output ports and common control equipment. Each input port is capable of accepting information asynchronous to the TDMA clock and at typical terrestrial clock rates. The input/output ports perform all the necessary signal processing for a TDMA terminal including pulse stuffing, changing continuous asynchronous low rate information to high bit rate burst form as well as forward acting error correcting encoding, if desirable. By incorporating all the signal processing in the multiplexer-demultiplexer, much equipment duplication is eliminated along with eliminating a requirement for multiple high frequency control and timing signal line drivers and buffers. More particularly, the transmit side of each port includes a separate elastic buffer to raise the input rate to a synchronous common higher rate. In addition, on the receive side, clocking on the low speed side of the expansion buffer is derived from the station's transmit clock.
REFERENCES:
patent: 3825899 (1974-07-01), Haeberle et al.
patent: 3838221 (1974-09-01), Schmidt et al.
patent: 3873773 (1975-03-01), Guy
A. Blank et al., "Concentrating Low Speed Lines into a High Speed Link", IBM Tech. Discl. Bull., Mar. 1976, pp. 3313-3314.
Eklof Anders
Gabbard Ova G.
Kaul Pradman
Muzumdar Deepak
Digital Communications Corporation
Kemeny E. S.
Morrison Malcolm A.
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