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

V.35 Technical Information

Serial Interface Control Signals

Signal
(Cable Pin)
ST (TC/TT)
RT (RC)
RTS (RTS)
DCD (DCD)
CTS (CTS)
DTR (DTR)
DSR (DSR)
© Polycom, Inc.
The ViewStation FX and the VS4000 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
OUT Send Timing (clock)
IN Receive Timing
(clock)
OUT Request To Send
IN Data Carrier Detect
IN Clear To Send
OUT Data Terminal
Ready
IN 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 indicate
169 ViewStation FX/VS 4000 User's Guide
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