Method and device for transmitting a digital engineering service

Details Method and device for transmitting a digital engineering service Method and device for transmitting a digital engineering service

1988-12-15

1990-05-29

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

H04L 2548

Patent

active

049301276

ABSTRACT:
The method enables transmission of a digital service channel by means of the parity channel of a digital bit stream transmitted in a parity checking code with parity words inserted at specific times by modifying certain parity words violating the parity checking code parity law. It consists in modifying spaced groups of even number of consecutive parity words so as not to disrupt analog detection of line errors. A digital service channel insertion circuit is included among the component parts of an MBIPIC type encoder whereby the data of a digital bit stream is transmitted by consecutive code words each formed of a block of data bits completed by a parity bit and an inversion bit. The digital service channel insertion circuit includes a modulator operative in a first computation logic circuit delivering the real value of the parity bit and a shaper circuit which strobes the digital service channel data at a timing rate that is low compared with that of the code words and selectively applies to the modulator according to the result of said strobing a pulse having the width of two code words.

REFERENCES:
patent: 4387460 (1983-06-01), Boutmy et al.
patent: 4393493 (1983-07-01), Edwards
patent: 4408325 (1983-10-01), Grover
patent: 4633464 (1986-12-01), Anderson
patent: 4682334 (1987-07-01), Le Mouel et al.
Journal of Lightwave Technology, vol. LT-2, No. 6, Dec. 1984, pp. 991-997, "The SL Supervisory System".
IEEE Journal on Selected Areas in Communications, SAC-2, No. 6, Nov. 1984, pp. 1042-1046, "Terminal Transmission Equipment (TTE) for the SL Undersea Lightwave System".

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