Polycom ViewStation EX4000 - Manual (Page 54)

Integrators’ Reference Manual for ViewStation EX, ViewStation FX, and VS4000
44 www.polycom.com
Crypto Resync
If a cryptographic encoder/decoder is connected between the
system and the network, it may require a resynchronization signal
from the system. This is a signal indicating that the system 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 use 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 system loses H.320 synchronization while in a call, it sends the
resynchronization pulses at the specified rate until H.320 regains
synchronization.
The resync pulse is output on the RTS signal. If this feature is
enabled, the RTS signal no longer functions as the Ready-To-Send
signal.
Most installations that use encryption equipment require a custom
cable. The cable should route the RTS signal from the system to the
appropriate resync input on the encryption equipment. The
encryption equipment can get its RTS input from the
videoconferencing system's DTR output or by tying this input high.
In this non-dialed mode, the DTR output and RTS output act alike.