Multiplex communications – Wide area network – Packet switching
Patent
1986-04-18
1988-11-01
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
375106, 375111, H04J 306, H04L 700
Patent
active
047824840
ABSTRACT:
An encoder method for processing an input data signal to produce binary coded data frames and to provide for synchronized, high-speed operation partitions the incoming data into contiguous frames composed of a plurality of bit positions. For each frame, a synchronizing signal comprising a pulse in the first bit position and no pulse in the midpoint bit position is propagated over the channel. Any station gaining access to the channel propagates its data samples in the remaining positions in each frame. Thus, the channel signal includes a component which is a subharmonic of the bit rate and this subharmonic is used to derive a synchronizing signal in a decoder.
The decoder method for detecting the samples in the contiguous frames includes the steps of processing the synchronizing signal to produce signals at both the frame and bit rates and extracting a sampling signal in correspondence to the locations of the data samples in the frames. In order to achieve a preselected end-to-end transmission rate in the overall system, the rate of the signal propagated between encoder (400) and decoder (200) is increased to compensate for the interleaved synchronizing signal.
REFERENCES:
patent: 3200198 (1965-08-01), McRae
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patent: 3390232 (1968-06-01), Jager et al.
patent: 3593140 (1971-07-01), Kaneko
patent: 3749845 (1973-07-01), Fraser
patent: 4298978 (1981-11-01), Nakamura
patent: 4439763 (1984-03-01), Limb
patent: 4486740 (1984-12-01), Seidel
patent: 4606056 (1986-08-01), Perloff
Bell Communications Research Inc.
Falk James W.
Marcelo Melvin
Olms Douglas W.
Peoples John T.
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