Telephonic communications – Subscriber line or transmission line interface
Patent
1999-08-27
2000-10-24
Chan, Wing F.
Telephonic communications
Subscriber line or transmission line interface
H04M 100, H04M 1100
Patent
active
061378801
ABSTRACT:
A dual-mode filter network for an Asymmetric Digital Subscriber Line (ADSL) has a first frequency response when the Plain Old Telephone Service (POTS) telephone is on-hook and has a second frequency response when the POTS telephone is off-hook. A detector is used to determine the on-hook/off-hook status. The dual-mode filter network may be situated at the central unit and connected to a Public Switched Telephone Network (PSTN) while the detector at the remote unit connected between the POTS low pass filter and the POTS telephone. In such case, the detector outputs a signal which is transmitter via the twisted pair on an overhead channel. Alternatively, the dual-mode filter and the detector may be co-located at either the central unit or at the remote unit. Regardless of where it, or the detector are located, the dual-mode filter network has at least different combinations of components which are activated, depending on the on-hook/off-hook status of the POTS phone. In addition, a single-mode filter instead of the dual-mode filter can be used at the remote unit.
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IEEE Journal On Selected Areas In Communications, vol. 13, No. 9, ADSL and VADSL Splitter Design and Telephony Performance, Jim Cook and Phil Sheppard, Dec. 1995.
Chan Wing F.
Westell Technologies, Inc.
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