Loopback test system

Details Loopback test system Loopback test system

1978-12-29

1980-04-01

Robinson, Thomas A.

Multiplex communications

Wide area network

Packet switching

370 15, H04B 346, H04J 314

Patent

active

041963210

ABSTRACT:
A subscriber loop carrier system is disclosed for frequency multiplexing a plurality of subscriber channels on a single twisted metallic pair using frequency division techniques. Supervisory signaling is accomplished from the central office to a remote location by imposing a signaling tone of the carrier frequency for each signal. Supervision from the remote terminal to the central office is accomplished by interrupting the carrier signal itself. Ringing signals are supplied by interrupting the tone signal at a 20 Hz rate. Testing the subscriber channel is accomplished by leaving the tone on for a period in excess of the period used for ringing. Each channel of the carrier system can, therefore, be independently tested by using the uninterrupted tone to gate the remote carrier on for transmission back to the central office terminal. When detected, this carrier signal from the remote terminal indicates a complete communication path from the central office to the remote terminal and back again, i.e., channel continuity.

REFERENCES:
patent: 3410966 (1968-11-01), Davies
patent: 4002847 (1977-01-01), Dail
patent: 4076971 (1978-02-01), Mukaemachi et al.
patent: 4101743 (1978-07-01), Costes et al.

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