Method and arrangement for loop test of a disturbed line
US7426262B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 8, 2004 |
| Grant date | Sep 16, 2008 |
| Priority date | — |
| Expiry date | Feb 24, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/493
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The invention refers to single-ended test of a loop (2, 3). A test device (TD1) is connected to a remote device (3) via a line (2). The remote device is powered on and transmits intermittently handshake signals (HS1), which can disturb the loop test. A receiving and calculating unit (RE1) detects the handshake signals (HS1) and orders a sending unit (SD1) to send a halting signal (NAK-EF) to the remote device. The latter is halted for predetermined silent period of time, during which the test or a part of it is performed. If required the halting of the handshake signals is repeated. The test device sends a broadband loop test signal (S1) and receives a reflected signal (S2) during the silent period. A frequency dependent echo transfer function is generated from the signals (S1, S2) and is used for generating desired properties of the line (2) such as its length (L).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.