V.35 Technical Information; General V.35 Information; Serial Interface Control Signals - Polycom ViewStation EX User Manual

V.35 Technical Information

General V.35 Information

Serial Interface Control Signals

Signal
(Cable Pin)
ST (TC/TT) OUT
RT (RC) IN
RTS (RTS) OUT
DCD (DCD) IN
CTS (CTS) IN
DTR (DTR) OUT
DSR (DSR) IN
© Polycom, Inc.
The ViewStation is designed to be compatible with tested network
equipment without any modification from the user. If your network
equipment varies from conventional V.35 video implementations,
you can adjust the operation of the signals. Use the following
technical information with information provided by your network
equipment vendor to customize your V.35 interface.
The following table describes the configuration of each signal.
Direction Description
Send Timing
(clock)
Receive Timing
(clock)
Request To Send
Data Carrier
Detect
Clear To Send
Data Terminal
Ready
Data Set Ready
Configuration Option
Normal: falling edge sends data
Inverted: rising edge sends data
Normal: rising edge receives data
Inverted: falling edge receives data
Normal: high voltage is logic 1
Inverted: low voltage is logic 1
Normal: high voltage is logic 1
Inverted: low voltage is logic 1
Filter: allow DCD to drop for 60 seconds
before changing call state
Normal: high voltage is logic 1
Inverted: low voltage is logic 1
Normal: high voltage is logic 1
Inverted: low voltage is logic 1
On: constant high voltage
Note: if set to ON, inverted is not an
option.
Normal: high voltage is logic 1
Inverted: low voltage is logic 1
Answer: Use DSR as a Ring-In indicator
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ViewStation User Guide