Maintenance termination unit

Details Maintenance termination unit Maintenance termination unit

1985-07-25

1986-12-02

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

307252B, H04B 346, H03K 1772

Patent

active

046266321

ABSTRACT:
An improved and simplified voltage sensitive switching unit for opening a telephone subscriber pair at the line of demarcation for purposes of conducting line tests of the pair from the telephone central office to determine the state of the line. Relatively complex prior art circuitry is replaced by a combination of inexpensive solid state devices which eliminates the need for a prior art combination of diode bridge and transistor switching network.

REFERENCES:
patent: 4052624 (1977-10-01), Hamstra
patent: 4181921 (1980-01-01), Taylor et al.
patent: 4485271 (1984-11-01), Norling et al.

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