Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Including fault responsive disconnection of tested component
Patent
1993-06-30
1996-01-09
Chin, Stephen
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Including fault responsive disconnection of tested component
379 8, 379 21, 379 22, 379 24, 379 27, 379 29, 379 30, 379161, 379184, 379194, 379195, H04M 124, H04M 322, H04M 100, H04M 300
Patent
active
054835739
ABSTRACT:
A connector unit (21) for automatically terminating a digital data services (DDS) line whenever a mating modular plug (30) is not inserted into the connector. The connector utilizes a switchable DDS jack (25) that mates with the modular plug (30) for connecting a data-transmit line and a data-receive line of a DDS network (41) to a customer's equipment (45). The connector unit has a maintenance termination circuit (40) with terminating impedances (r, r1, C and C1) and diodes (D and D1). When the plug and jack are not engaged, the maintenance termination circuit is connected to the data-transmit and data-receive lines via the normally closed jack contacts (33 and 34). As the plug and jack are engaged, the plug abuts against and, as movement continues, increasingly opens the jack contacts, causing the maintenance termination circuit to be disconnected from the customer's equipment and to be connected to the DDS network. The diodes are oppositely polarized to provide a signature for testing proper installation of the connector unit. When connected to the DDS network, the terminating impedances provide electrical terminating loads which reduce network noise.
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Calderwood Michael T.
Steenton George R.
Bell Atlantic Network Services Inc.
Chin Stephen
Keptel, Inc.
Michaelson Peter L.
Shankar Vijay
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