Signaling method for invoking a test mode in a network interface unit
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United States of America Patent
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-
Aug 21, 2001
Issued Date -
N/A
app pub date -
Nov 3, 1999
filing date -
Nov 25, 1998
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A network interface device intended to be placed approximate to the customers equipment and remote from a central office of a telephone company ('TELCO'). The purpose of the network interface device is to allow the twisted pair transmission line between the central office and the customer's port to be selectively switched from a normal monitoring mode into a test mode. The test mode has two phases. In the first phase, the NIU transmits a signal back to the central office. This allows the central office to determine whether there are any problems with the transmission line, the potential bandwidth for the transmission line and related parameters concerning the efficacy and suitability of the transmission line for a variety of communication services. In the second phase, which is entered into upon completion of the first phase, the customer-end ADSL low pass filter is bypassed so that the central office can test the customer's POTS equipment.
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