Telephonic communications – Subscriber line or transmission line interface
Patent
1998-05-08
2000-10-31
Woo, Stella
Telephonic communications
Subscriber line or transmission line interface
379412, 379377, 379382, 379 9305, H04M 1100
Patent
active
06141414&
ABSTRACT:
A data access arrangement (DAA) for interfacing a modem with a telephone line which requires only one safety barrier device for providing electrical isolation of the modem from the telephone line for both a ring detection signal and a remote device hang-up detection signal transmitted from the DAA to the modem. The DAA utilizes the same combined circuitry to transmit both the ring detection signal and the hang-up detection signal to the modem. The single safety barrier device is selectively connected to either ring detection circuitry during an On-Hook mode or remote hang-up detection circuitry during an Off-Hook mode by a selectively operating a relay switching device. With this arrangement, an improved DAA is provided having a combined circuit configuration for communicating ring detection information to the modem during the On-Hook phase and communicating remote hang-up detection information to the modem during an Off Hook phase, thus minimizing the size, cost, and complexity of the DAA.
REFERENCES:
patent: 5600715 (1997-02-01), Bingel
patent: 5654984 (1997-08-01), Hershbarger et al.
D'Angelo Wilfrid C.
Mathe Jacques
Pater Daniel Jean
Conexant Systems Inc.
Woo Stella
LandOfFree
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