Tadiran Telecom Coral IPx Office, Installation And Hardware Reference Manual, Page: 439 / 510

Coral IPx Office Installation Manual Peripheral Cards
10-19
Digital T
ru
nk Synch
ron
ization
10
BRI Lines for Synchronization
1) BRI lines used for synchronization must be defined in the PI
(Route:
DTDB, 4)
SYNC - YES. See PI Manual Chapter 26 - ISDN for more
information.
2) It is not recommended to use BRI lines defined as
PERMANENTLY_ACTIVE_CHANNEL - NO as synchronization sources.
It is not recommended to use a PRI card with IPAT IC (hardware issue 4) chip
as a synchronization source.
Order of Preference
The possible digital trunk synchronization sources are listed in order of preference:
1. PRI or T1/E1 card (all types) connected to PSTN type stratum #3 - TANDEM
switch (North America only).
2. PRI or T1/E1 card (all types) connected to PSTN type stratum # 4 (End
office).
3. PRI or T1/E1 card (all types) connected to a private network. There are three
possibilities listed in order of preference.
a. The network is synchronized on PSTN stratum #4 (or less).
b. The private network contains a stable internal clock.
c. The private network is synchronized to the Coral - do not use for
synchronization .
4. 4TBR and 8TBR card (all types) connected to the PSTN.
5. 4TBR and 8TBR card (all types) connected to a private network. The three
possibilities are the same as listed in order of preference in possibilities
3.a - 3.c above.
When the Coral operates in Master Clock mode and the private network is synchronized
by the Coral, it is prohibited to insert Digital Trunk cards in the synchronization slots.