Remote testing of subscriber line interface circuits

Details Remote testing of subscriber line interface circuits Remote testing of subscriber line interface circuits

1982-03-09

1984-04-24

Schreyer, Stafford D.

H04B 346

Patent

active

044450079

ABSTRACT:
This test system is intended to test subscriber line interface circuits (1), (2), . . . etc. which are connected by means of one end to subscriber lines and by means of the other end are put in connection with a test apparatus (107). Change-over means (26), (27) or (76), (77) are provided to disconnect each interface circuit such as the interface circuit (1) or the interface circuit (2) from its subscriber line and to connect it to a test bus (112), (113) which is common to one group of interface circuits. Control means are provided in the test appartus (107) for connecting, depending on the test to be effected, one interface circuit or two interface circuits to the test bus. This test system allows remote testing of interface circuits, for example from a telephone exchange by using only the normally existing links between this exchange and the interface circuits.

REFERENCES:
patent: 4317967 (1982-03-01), De Vries et al.

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