Telephonic communications – Line equalization or impedance matching
Reexamination Certificate
2005-07-19
2005-07-19
Tran, Sinh (Department: 2644)
Telephonic communications
Line equalization or impedance matching
C379S399010, C379S093010, C379S093050
Reexamination Certificate
active
06920217
ABSTRACT:
Combined plain old telephone system (POTS) and digital subscriber loop (DSL) line card capable of suppressing low frequency transients. The line card includes the following elements. A DSL receive path receives DSL data from a loop. A POTS receive path receives POTS data from the loop. A combined POTS and DSL transmit path transmits POTS and DSL data to the loop. An impedance generator is coupled between the POTS receive path and the combined POTS and DSL transmit path for synthesizing impedance for signals in the combined POTS and DSL transmit path. A low frequency detector selectively applies a high pass filter to an output of the impedance generator for filtering the low frequency transients. Further, a clipped signal detector and a variable pole high pass filter are provided in the POTS receive path. The clipped signal detector in the POTS receive path triggers a switch that discharges stored transient energy in the receive path. The variable pole high pass filter in the POTS receive path is modified during ringing and hook switch activity, by the line card controller, in order to attenuate transient signals.
REFERENCES:
patent: 6067316 (2000-05-01), Amrany et al.
patent: 6192109 (2001-02-01), Amrany
patent: 6295343 (2001-09-01), Hjartarson et al.
patent: 6314180 (2001-11-01), Bingel
patent: 6470059 (2002-10-01), Starr
patent: 2002/0114444 (2002-08-01), Anderson et al.
Dziawa Michael
McClennon Scott
McGinn S. Donald
Tremblay Francois
Ciena Corporation
Potomac Patent Group PLLC
Swerdlow Daniel
Tran Sinh
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