Polycom VS4000 Administrator's Manual page 69

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To configure crypto resync:
1. Go to System Info > Admin Setup > Security > Crypto Resync.
2. Configure these settings:
Setting
Crypto Resync
Time Between Pulses (sec)
Pulse Width (millisec)
You may need to use crypto resync when you connect a cryptographic coder/decoder
between the system and the network. This allows the system to signal the cryptographic
device when video synchronization is interrupted.
Description
Allows a system connected to cryptographic equipment to
signal when it loses video synchronization during a call.
The cryptographic equipment can then resynchronize
with the far end.
When this option is enabled, the resynchronization pulses
are sent out on the RTS signal.
To use this option, the cable to your cryptographic
equipment should route the V.35/RS-449/RS-530 network
interface module's RTS signal to the appropriate resync
input on the cryptographic equipment. The equipment's
RTS input can be connected to the V.35/RS-449/RS-530
network interface module's DTR output or tied high.
Specifies the time between resync pulses in seconds.
Specifies the pulse duration in milliseconds.
Chapter 3 - Configuring Network Use
3-21