Step-by-step remote locating system for repeaters in a PCM link

Multiplex communications – Wide area network – Packet switching

Patent

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Details

17917531R, 370 97, H04B 346

Patent

active

044020759

ABSTRACT:
A step-by-step remote locating system for a digital bidirectional transmission link includes repeater pairs between a monitoring end equipment and a remote equipment. The monitoring equipment transmits remote location sequences and a locate end interruption on a forward channel. The sequences are intended to command closing and opening respective loop-back paths between two repeaters of the pairs. Each sequence comprises a predetermined integral number k of nonconsecutive interruptions in a transmitted digital signal throughout a predetermined period and, with the exception of the first sequence, an interruption preceding the k interruptions intended for opening the loop-back path of the preceding pair. The remote locate circuit associated with each repeater pair comprises an interruption counter. When the count of the counter is k the respective loop-back path to the monitoring equipment is closed. When the count is not equal to k, the loop-back path is opened. The count of the counter automatically returns to zero in response to a count less than k at the end of the predetermined period or in response to a locate end interruption longer than the predetermined period.

REFERENCES:
patent: 4161635 (1979-07-01), Wolaver
patent: 4336610 (1982-06-01), Steiner
patent: 4355215 (1982-10-01), Legras et al.

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