Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
Patent
1995-03-14
1998-01-27
Kuntz, Curtis
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Testing of subscriber loop or terminal
379 10, 379 15, 379 27, 379 33, 379 34, H04M 308, H04M 322
Patent
active
057128987
ABSTRACT:
A performance monitoring arrangement conducts auxiliary in-band communications between a line interface unit and one or more channel units of a D4 channel bank without interrupting transmission of digital data to and from a customer premises. During a first, initialization mode of operation, and a second, smart performance-monitoring mode, the data communication format of a channel bank RNPCM bus is modified to allow insertion of an auxiliary line interface unit-sourced command bit between selected bits of the data. During the second mode of operation, the communication format of the channel bank link is further modified to provide for the transmission of the data at an increased data rate. This increased data rate permits a response message bit from the channel unit to be asserted on the RNPCM bus during a first time interval separate from that occupied by the increased rate data. During the smart mode, the line interface unit also controllably asserts a yellow alarm code signal onto the RNPCM bus during a second time interval that is separate from the first time interval and that occupied by successive bits of increased rate data.
REFERENCES:
patent: 4641299 (1987-02-01), Kemper
patent: 5018184 (1991-05-01), Abrams
patent: 5054050 (1991-10-01), Burke
patent: 5208803 (1993-05-01), Conforti
patent: 5495576 (1996-02-01), Lee
Bailey Scott C.
Hall, III Clifford L.
Wells Jeffrey B.
Adtran Inc.
Kuntz Curtis
Shankar Vijay
Wands Charles E.
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