Termination circuit for network interface unit

Details Termination circuit for network interface unit Termination circuit for network interface unit

2005-07-05

2009-10-27

Tran, Quoc D (Department: 2614)

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of trunk or long line

C379S029010, C379S413020

Reexamination Certificate

active

07609817

ABSTRACT:
A network interface unit has an interface coupled to a first transmit line and a first receive line, and the interface is configured to receive a signal from the first receive line. The network interface unit further has circuitry operable in a test mode and a data mode that couples the received signal to the second transmit line via a first path while operating in the data mode. The circuitry further disables coupling of the signal to the second transmit line, couples the signal via an alternate path to the first transmit line, and creates a bias voltage about which a termination impedance for the second transmit line is centered while operating in test mode.

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patent: 7068757 (2006-06-01), Burnett

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