Telephonic communications – Subscriber line or transmission line interface
Reexamination Certificate
2005-02-01
2005-02-01
Harvey, Minsun Oh (Department: 2644)
Telephonic communications
Subscriber line or transmission line interface
C379S414000, C375S222000
Reexamination Certificate
active
06850618
ABSTRACT:
A splitterless interface between a digital subscriber line (DSL) and the central office equipment that can receive and isolate the low frequency voice data and high frequency digital data from a telephone line. This interface can also mix and transmit low frequency voice data and high frequency digital data onto a telephone line. For POTS band frequencies, a reactive impedance coupled across the two-wire interface of the POTS line card, and serially coupled to the line side of the DSL coupling transformer, has an open state magnitude. The magnitude of the line side windings of the DSL coupling transformer is low at POTS band frequencies. POTS band signal power is therefore delivered to the POTS line card. For DSL band frequencies, the reactive impedance across the two-wire interface of the POTS line card has a closed state magnitude. The POTS line card is therefore essentially short-circuited at DSL band frequencies, and DSL band signal power is delivered to the DSL modem. The frequency band in which the reactive impedance transitions from an open state magnitude to a closed state magnitude corresponds to the frequency band between the POTS frequency band and the DSL frequency band.
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Babaei Heron
Kiykioglu Serdar
Mohajeri Hessam
Centillium Communications Inc.
Fenwick & West LLP
Harvey Minsun Oh
Tran Con P.
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