Digital service unit

Details Digital service unit Digital service unit

1990-03-02

1991-01-08

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

With blocking of normal usage

379 27, 371 205, H04G 346, H04M 124

Patent

active

049842625

ABSTRACT:
Network termination equipment including structure for transmitting signals back for loopback test. This can test all the functions of the unit by executing the loopback test only after having verified the normal operation of the circuits related to a call origination.

REFERENCES:
patent: 4766594 (1988-08-01), Ogawa et al.

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