Telephonic communications – Line equalization or impedance matching
Patent
1996-12-20
1999-12-21
Tsang, Fan S.
Telephonic communications
Line equalization or impedance matching
379399, 379418, 455426, H04M 164
Patent
active
060059346
ABSTRACT:
A fixed wireless access subscriber unit containing a wireless transceiver and a telephone subscriber line interface circuit which supports privacy and remote release of hold between the subscriber unit and extension telephones are disclosed. The subscriber unit detects when the primary handset, or an extension telephone set goes off-hook. In response the subscriber unit modifies the voltage and/or current characteristics on the telephone subscriber line which connects the extension sets to the subscriber unit in such a manner that extension sets connected to the telephone subscriber line will sense when the primary handset goes off-hook.
REFERENCES:
patent: 4396805 (1983-08-01), Wagner
patent: 4658096 (1987-04-01), West, Jr. et al.
patent: 4712233 (1987-12-01), Kuo
patent: 4718080 (1988-01-01), Serrano et al.
patent: 4737975 (1988-04-01), Shafer
patent: 4775997 (1988-10-01), West, Jr. et al.
patent: 4922517 (1990-05-01), West, Jr. et al.
patent: 4959851 (1990-09-01), Tobolski, Jr. et al.
patent: 5117450 (1992-05-01), Joglekar et al.
patent: 5140631 (1992-08-01), Stahl
patent: 5287404 (1994-02-01), Pepper et al.
patent: 5404491 (1995-04-01), Huzenlaub et al.
patent: 5422949 (1995-06-01), Tsukagoshi
patent: 5483576 (1996-01-01), Staples
patent: 5515434 (1996-05-01), Cotreau
patent: 5521974 (1996-05-01), Hayashi et al.
patent: 5535265 (1996-07-01), Suwandhaputra
patent: 5544241 (1996-08-01), Dibner et al.
patent: 5619567 (1997-04-01), Apfel
patent: 5694465 (1997-12-01), Apfel
patent: 5706336 (1998-01-01), Kikinis
"MH88500, Hybrid Subscriber Line Interface (SLIC)" Preliminary Information, Issue 5, Apr. 1995.
Goodenough, F.: "Slic Ejects Relays From PABX Line Cards", Electronic Design, vol. 42, No. 14, Jul. 11, 1994, pp. 55-56, 58-59, 62-64.
Measures Jeffrey M.
Nortel Networks Corporation
Tsang Fan S.
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