Signal coupler using high voltage and low voltage filtering
First Claim
Patent Images
1. A signal coupler comprises:
- high-voltage low pass filter operably coupled to low pass filter an analog signal to produce a partially filtered Plain Old Telephone System (POTS) signal;
subscriber loop interface circuit operably coupled to provide a two-wire to four-wire interface conversion between a PTIP line and PRING line carrying the filtered POTS signal, a transmit line pair, and a receive line pair, wherein an incoming portion of the partially filtered POTS signal is provided on the transmit line pair; and
low-voltage low pass filter operably coupled to low pass filter the incoming portion of the partially filtered POTS signal to produce a filtered incoming POTS signal.
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Abstract
A signal coupler is provided which decreases the number of discreet elements required to provide low pass filtering for the plain old telephone service (POTS). The low pass filtering is shifted to areas of the signal coupler circuit which do not operate with the high battery voltage present on telephone lines. The low voltage filtering reduces the need for components, which are capable of operating in the high voltage environment and therefore reduces the space on the circuit board, which is occupied by each of the signal couplers. In this way, the number of individual subscriber lines that a given circuit board can accommodate can be increased.
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Citations
6 Claims
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1. A signal coupler comprises:
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high-voltage low pass filter operably coupled to low pass filter an analog signal to produce a partially filtered Plain Old Telephone System (POTS) signal;
subscriber loop interface circuit operably coupled to provide a two-wire to four-wire interface conversion between a PTIP line and PRING line carrying the filtered POTS signal, a transmit line pair, and a receive line pair, wherein an incoming portion of the partially filtered POTS signal is provided on the transmit line pair; and
low-voltage low pass filter operably coupled to low pass filter the incoming portion of the partially filtered POTS signal to produce a filtered incoming POTS signal. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification