Philips DBS-EX23-530 manual Isdn System Settings Programming Reference

ISDN System Settings Programming Reference

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 3-5for 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 4-4for 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)

4-6 DBS-EX23-530 Revised April 2000