Dual test mode network interface unit for remote testing of transmission line and customer equipment
US6181775A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 10, 1999 |
| Grant date | Jan 30, 2001 |
| Priority date | — |
| Expiry date | May 10, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/2209
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.