Configure
Chapter 5: Operating Instructions
Page 5-28
VersaMux-4000 Operation & Installation Guide
Part No. 24001157
Revision C
Resync-Delay Explanation
End Around Delay is the period of time for a transmitted signal to travel to the
remote VersaMux-4000 unit and then back to the local unit.
illustrates
the end around delay in a typical satellite system.
Figure 5-17
End Around Delay Example
In this example it may take 240 milliseconds for the signal to travel over the
satellite link from the local VersaMux-4000 unit to the remote unit. Therefore, not
including any delays from the cryptos, the total end around delay would be 480
milliseconds (about half a second).
If the
Resync-Delay
parameter period is less than the time required for the local
and remote cryptos to communicate and re-synchronize the VersaMux-4000 unit
will continuously issue resync commands preventing re-synchronization.
Increase the
Resync-Delay
period if you observe that the cryptos continuously
attempt to resync without achieving re-synchronization.
Crypto Setup
Upon loss of synchronization (with the
KG-Resync
parameter enabled), the
VersaMux-4000 initiates a resync pulse to the crypto (red-side) which lasts
between 6 to 8 milliseconds.Therefore, the crypto resync level "time-out-period"
must be shorter than 6 milliseconds to ensure the resync occurs.
Trunk Encryption
Device (TED)
240 milliseconds
240 milliseconds
Trunk Encryption
Device (TED)
End Around Delay
(240 ms + 240 ms = 480 ms)
VERSAMUX 4000
NO ALARMS
POWER
AGGR
CLK REF
PORTS
FAULT
VersaMux-4000
VersaMux-4000
VERSAMUX 4000
NO ALARMS
POWER
AGGR
CLK REF
PORTS
FAULT
VersaMux-4000
VersaMux-4000
