Title:
Arrangement for testing telephone subscriber line circuit via B-ISDN channel linking central office test system and metallic channel unit installed indigital loop carrier remote terminal
Document Type and Number:
WIPO Patent Application WO1997001235
Kind Code:
A3
Abstract:
A subscriber line circuit test and conditioning arrangement for use with a non-metallic (fiber optic) digital communication path-based digital communication network employs a single (basic rate ISDN) metallic channel unit (BMCU) installed at a site terminating the fiber optic communication path. A BMCU communicates with a central office test system using an auxiliary B-ISDN communication 'test' channel portion (2B+D) channels of the time division multiplexed digital communication DS0 channels. Digital command and response signals are transported by the two ISDN bearer (B) channels and are coupled directly to tip and ring digital signal processors in the central office test system, without the need for intermediate digital-to-analog and analog-to-digital conversion by a metallic channel unit at a central office terminal, and that additionally performed by a central office terminal and central office switch. The data (D) channel is employed to conduct access, calibration and control communications with the metallic channel unit.
Inventors:
BARRON JOSEPH EUGENE (US)
SCHILLACI ONOFRIO (US)
SCHILLACI ONOFRIO (US)
Application Number:
PCT/US1996/010333
Publication Date:
April 30, 1998
Filing Date:
June 13, 1996
Export Citation:
Assignee:
HARRIS CORP (US)
International Classes:
H04Q11/04; (IPC1-7): H04B10/08; H04M3/22; H04J3/14
Foreign References:
| US5301050A | 1994-04-05 | |||
| US5202919A | 1993-04-13 | |||
| US5239535A | 1993-08-24 |
Download PDF:
Previous Patent: FREQUENCY- AND PHASE-REGULATOR CIRCUIT FOR VSB RECEIVERS
Next Patent: HYBRID FIBER COAX COMMUNICATIONS SYSTEM
Next Patent: HYBRID FIBER COAX COMMUNICATIONS SYSTEM