Verilink DPRI 2922 (880-503142-001) Product Manual - Manual (Page 41)

Configuring the DPRI 2922 Via the NCM 2000 Craft Interface
Verilink DPRI 2922
3-11
Configuration
Menu (Timing
Options)
To access the Configuration Menu (Timing Options), enter T from
the T1 Port Configuration Menu, Figure 3-4.
Use this menu to determine the transmit timing source of the DPRI
modules. If the DPRI module derives its timing from another card
in the shelf, enter the slot of the module to be the timing source.
This includes the option of setting the DPRI as the timing source
for the shelf.
Select primary, secondary, and tertiary timing sources. The
secondary and tertiary timing sources provide a backup for the
primary timing source. The Auto Restore option determines which
timing source is used when the primary timing source fails,
restores, and then remains viable for a period of 60 seconds.
If the primary source fails, the secondary source becomes the
timing source. When the primary source recovers and the Auto
Restore option is set to “Yes”, the primary source resumes service
as the DPRI module’s timing source. If the Auto Restore option is
set to “No”, the secondary source remains the timing source until
you manually reconfigure the primary source, or set its Auto
Restore option to “Yes”.
NOTE: For ISDN, the network ALWAYS supplies a clock that MUST be the
source.
Figure 3-6 Configuration Menu (Timing Options)
For ISDN, you must provide shelf timing derived from the ISDN PRI
span. All cards with dial-backup must use shelf timing. Set the
secondary timing source for the second ISDN port, if used
(otherwise set it to internal). The following options are valid if you
specified “No” to “Receive Clock from Shelf”:
-- DPRI 2922 CONFIGURATION MENU (TIMING OPTIONS)--
Current card timing source: INTERNAL (PRIMARY)
Source Synchronization Auto Restore
PRIMARY PS) NET1 PA) YES
SECONDARY SS) NET2 SA) YES
TERTIARY TS) INTERNAL TA) NO
R) Receive clock from shelf: NO
X) exit this screen
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