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

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