Telephonic communications – Subscriber line or transmission line interface
Patent
1998-03-04
2000-12-12
Smits, Talivaldis I.
Telephonic communications
Subscriber line or transmission line interface
379413, 379382, 379377, 379412, H04M 100
Patent
active
061608858
ABSTRACT:
The communication system disclosed herein allows for the hookswitch devices to draw loop current from the phone line in both on-hook and off-hook conditions. Thus, even though an on-hook condition occurs, current may be obtained through the hookswitch devices. This feature allows circuitry which operates during on-hook conditions to still receive power from the phone line. Moreover because the hookswitch devices are utilized for drawing power in both on-hook and off-hook conditions, the use of additional switches dedicated to drawing the power during on-hook conditions is not required. For example, loop current may be drawn from the phone line through the hookswitch devices to power circuits used to perform the on-hook caller ID function. The powered circuits may include for example analog to digital converters. The technique disclosed herein for drawing current through the hookswitch devices is particularly useful for communications systems which utilize a capacitive isolation barrier system.
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Scott Jeffrey W.
Sooch Navdeep S.
Welland David R.
Chawan Vijay
Silicon Laboratories Inc.
Smits Talivaldis I.
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