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ISDN System Settings
Programming Reference
4-6 DBS-EX23-530 Revised April 2000
Parameter Sync Source 3
Description Determines the source of clocking for the third sync source. The
third sync source is used if both the first and second source fail.
The system will attempt to switch from the third source back to the
first source based on the value entered under “Network Re-sync
Timer” (page 4-7).
In most cases, a system with one ISDN has the 3rd sync source set
to “0.” Systems with two ISDNs normally have the 3rd sync source
set to “3.” See page 3-5 for a list of typical sync source settings for
single and double-cabinet systems.
One of the three sync sources should be set to “3” (free run). A
free-run setting is needed, so the DBS ISDN can provide its own
clocking if the network clock fails.
(See “Sync Source 1” on page 4-4 for an introduction to clock syn-
chronization.)
Notes:
1. The “free run” setting is the only setting that can be entered for
more than one sync source.
2. For changes to this parameter to take effect, the system must be
powered down, then back up again.
Programming FF1 9# 4# 1# 4# (0-3)#
Options
0=None
1=ISDN of the master cabinet (synchronizes clocking with the
public network)
2=ISDN of the slave cabinet (synchronizes clocking with the pub-
lic network)
3=Free run (internal clocking)