Lucent Technologies Stinger, Руководство администратора

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Administering a Stinger System
Basic system settings
Stinger® Administration Guide 1-27
Configuring system clocking
The Stinger unit requires a clock source for its timing subsystem. By default, the
system uses the a built-in 8kHz clock on the single or primary control module as its
timing source. The
system-8k-clock parameter in the system profile specifies the
clock source for the Stinger system. You can configure the system to take its clock
source from a line interface module (LIM), trunk port, or from an external building
integrated timing supply (BITS) clock connected to the unit’s alarm relay. By default,
the
system-8k-clock parameter is set to controller .
Displaying the current clock-source
You can view the current clock source by using the get command to display the
setting for the system-8k-clock parameter. For example:
admin> get system system-8k-clock
[in SYSTEM:system-8k-clock]
system-8k-clock = controller
The clock-source command also displays the current clock-source along with
available clock sources.
admin> clock-source
Master: slot-1/1 line 3
Source List:
Source: slot-1/1 Available priority: 1
A line specified as the clock source can be used as the source of timing information
for synchronous connections, so both the sending device and the receiving device can
determine where one block of data ends and the next begins. If multiple lines specify
that they are the clock-source (the default configuration), you can assign clock-
source priority among multiple lines.
The following commands cause the system to first attempt to use a trunk port as its
clock source, and to use the built-in clock only if it finds no ports that are eligible
clock sources:
admin> read system
SYSTEM read
admin> set system-8k-clock = lim-or-trunk-module
admin> write
SYSTEM written
Configuring trunk ports as clock sources
You can specify whether a trunk port can be used to source the ATM network clock
and feed it to the primary control module as the master clock for the unit. To specify
whether a trunk port as eligible or ineligible for this use, set the
clock-source
parameter in the trunk profile for that port ( ds3-atm , oc3-atm , or e3-atm profile). You
can assign a high, middle, or low priority for being elected as the clock source by
setting the
clock-priority parameter in the trunk profile for that port.
If more than one line is eligible to be the clock source, the system chooses the one
with the highest priority, as specified by the
clock-priority setting. If multiple
sources of equal priority are present, the system selects the first valid clock source. (A
clock source is valid if the
clock-source parameter is set to eligible and the OC12,
DS3, OC3, or E3 interface is synchronized.)