Dial line monitor and control unit

Details Dial line monitor and control unit Dial line monitor and control unit

1990-10-25

1991-09-17

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Including fault responsive disconnection of tested component

379 32, 379 28, 371 82, H04M 308, H04M 324, G06F 1100

Patent

active

050502050

ABSTRACT:
A modem use monitor (MUM) is disclosed which is utilizable with one or more groups of modems for analyzing modem defects of the individual modems. Typically, a rotary hunt arrangement of telephone lines for data communications is sequentially served by several modems. For analytical purposes, an intercept device is provided to receive a data carrier detect signal from each modem. The intercept device has been enhanced to receive a plurality of signals and to facilitate defect analysis. Exemplary of the processed signals is the summing of the ring indicator (RI) signal and the data carrier detect (DCD) by means of a logical OR to provide a single test signal which can be examined for a ring-no-answer condition.

REFERENCES:
patent: 4451708 (1984-05-01), Kemler et al.
patent: 4819235 (1989-04-01), Kelly et al.
patent: 5001741 (1991-03-01), Sayer

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