3657–01 4-Wire Foreign Exchange Subscriber (4W FXS) Channel Unit
■Document Purpose
▲This document provides information on the Issue 5 version of the Charles Industries 3657–01 4-Wire Foreign Exchange Subscriber (4W FXS) Channel Unit.
■Equipment Function
▲The 3657–01, is used in the Charles Industries 360/363 D4 Digital Carrier Terminal to provide an interface to special service circuits
■Equipment Features
▲The 3657–01 (Issue 5) 4W FXS Channel Unit includes the following features:
◆Compliance with the specifications in AT&T Publication 43801
◆Front-panel-accessible bantam breaking-jacks for accessing the transmit and receive ports
◆Front-panel-accessible pin-jack test points (TX and TXR) for monitoring the transmit level
◆Selectable termination impedance of 150, 600, or 1200 ohms for matching the impedance at the 4-wire port interface
◆Transmit and receive prescription attenuation of 16.5dB in 0.1dB increments
◆Built-in jack to mount an optional 3691–00 Nonloaded Cable Equalizer or 3691–01 H88 Loaded Cable Equalizer Subassembly for post-equalization
◆Front-panel NORM/BUSY switch
◆Front-panel BUSY LED indicator
◆Selectable normal or reversed simplex-signaling leads for tandem operation with a 4W FXO channel unit in an intermediate office
◆Selectable loop-start or ground-start mode of operation
◆Selectable Build-Out Resistors (BOR) for a 300-ohm or less Short Loop (SL)
◆Compatibility with 100-millisecond ringing intervals
◆Ring tripping during the ringing or silent intervals
◆Selectable immediate-idle or delayed-busy trunk processing during carrier failure
◆Five-year warranty
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4-Wire Foreign Exchange Subscriber (4W FXS) Channel Unit 、 4W FXS Channel Unit |
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User's Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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March 2001 |
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Issue 5 |
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154 KB |
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