Telegraphy – Systems – Chemical
Patent
1976-10-18
1978-03-07
Claffy, Kathleen H.
Telegraphy
Systems
Chemical
178 70R, 179 15AD, 179 16EA, 325 13, 325 38A, 325 41, 3401461AB, H04B 336, H04B 304
Patent
active
040781593
ABSTRACT:
An end-office repeater accepts a high-speed bipolar signal, converts the bipolar signal into a unipolar signal, scrambles the unipolar signal, and encodes the scrambled unipolar signal into a modified duobinary signal for transmission over a cable pair. Before cable loss would severely degrade the duobinary signal, line repeaters and/or inter-office repeaters are installed at predetermined intervals so as to equalize and regenerate the modified duobinary signal. By so doing, the signal is recovered with acceptable phase jitter, which permits recovery of the original high-speed bipolar signal at the distant end of a repeatered span line. The receiving-end office repeater equalizes and regenerates the modified duobinary signal, decodes the signal to obtain a unipolar signal, descrambles the unipolar signal, and converts the unipolar signal into a bipolar signal.
Detection of errors in the modified duobinary signal may be obtained without adding redundant digits. However, errors which may occur during transmission may be lost by the decoding to a unipolar signal. Thus, errors detected from violations of the coding rule of the modified duobinary signal are inserted, by means of an error transfer network, into the bipolar signal and appear as violations of the bipolar code.
REFERENCES:
patent: 2996578 (1961-08-01), Andrews, Jr.
patent: 3303284 (1967-02-01), Lender
patent: 3337864 (1967-08-01), Lender
patent: 3343125 (1967-09-01), Lender
patent: 3434059 (1969-03-01), Kesolits
patent: 3461426 (1969-08-01), Lender
patent: 3798544 (1974-03-01), Norman
patent: 3838214 (1974-09-01), Lind
patent: 3876944 (1975-04-01), Mack et al.
patent: 4010421 (1977-03-01), Lind
Lender Adam
Olszanski Henry H.
Cannon Russell A.
Claffy Kathleen H.
Cool Leonard R.
GTE Automatic Electric Laboratories Incorporated
Myers Randall P.
LandOfFree
Modified duobinary repeatered span line does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Modified duobinary repeatered span line, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modified duobinary repeatered span line will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2021429