Method and apparatus for regenerating a modified duobinary...

Details Method and apparatus for regenerating a modified duobinary... Method and apparatus for regenerating a modified duobinary...

H - Electricity

04

L

340/98

H04L 1/00 (2006.01) H04B 3/14 (2006.01) H04L 7/027 (2006.01) H04L 25/24 (2006.01) H04L 27/08 (2006.01)

Patent

CA 1104694

ABSTRACT OF THE DISCLOSURE In PCM transmission, it is well known to transmit 24 voice-grade channels at a bit rate of 1.544 Megabits per second (Mb/3). The number of channels which may be transmitted in about the same bandwidth is doubled by the use of correlative level coding, such is the midfield duobinary technique. Because of the degradation experienced by the modified duobinary signal in passing over cable pairs, periodic regeneration of the signals is required for effective transmission. The present invention is directed to a regenerative repeater which equalizes, amplifies, reshapes, ant retimes the received modified duobinary signal so as to provide a regenerated signal which is nearly identical with that originally transmitted.

287511

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