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Appendix C V.35 Technical Information
© Polycom, Inc. 199 ViewStation User Guide
Crypto Resync
If a cryptographic encoder/decoder is connected between the
ViewStation and the network, it may require a resynchronization
signal from the ViewStation. This is a signal indicating that the
ViewStation has lost video synchronization due to a network
problem and requires that the cryptographic encoder/decoder
resync with the equipment at the other end of the connection.
To enable this feature select System Info > Admin Setup >
Security. When you select the Crypto Resync option, the Crypto
Resync Pulse screen appears.
On this screen, you can enable crypto resync, set the time between
pulses (in seconds), and set the pulse width (in milliseconds).
If the ViewStation is in a call and it loses H.320 synchronization, it
continuously sends the resynchronization pulses at the specified
rate with the specified pulse width until H.320 regains
synchronization.
The resync pulse is output on the Ready-To-Send or RTS signal. If
this feature is enabled, the RTS signal no longer functions as the
RTS signal. Most installations that use encryption equipment require
a custom cable. The cable should be designed to route the RTS
signal from the ViewStation to the appropriate resync input on the
encryption equipment. The encryption equipment can get its RTS
input from the ViewStations DTR output or by wiring this input to an
always-high tie-off. In this nondialed mode, the DTR output and RTS
output act exactly the same. Refer to the V.35 State machine
descriptions in this appendix for more information on these signals.