Fore Systems forerunner series, Configuration Manual

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ForeRunner ATM Switch Network Configuration Manual
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Configuring Timing
9.5.3 Configuring Timing on an ASX-1000 (Multiple Timing Domains)
This example assumes that you are going to use 1C1 as your primary clock and 1D1 as your sec-
ondary clock for fabrics 1 and 2 and that you are going to use 3A1 as your primary clock and 3B1
as your secondary clock for fabrics 3 and 4. The only limitation on an ASX-1000 is that you must
configure both the primary and secondary export clocks to be on the same fabric.
1. On fabrics 1 and 2, use the following AMI commands to set your primary and sec-
ondary clocks as follows:
conf timing switchclock primary 1c1
conf timing switchclock secondary 1d1
2. On fabrics 3 and 4, use the following AMI commands to set your primary and sec-
ondary clocks as follows:
conf timing switchclock primary 3a1
conf timing switchclock secondary 3b1
9.5.4 Configuring Timing on a ForeRunnerLE 155
This example assumes that you are going to use 1D1 as your primary clock and 1D2 as your
secondary clock. Use the following AMI commands to set your primary and secondary clocks
as follows:
conf timing switchclock primary 1d1
conf timing switchclock secondary 1d2
The ports in interface groups A, B, C, and the Port Expansion Module (PEM) (interface D) use
the crystal on the fabric as their timing source by default. Only the PEM can recover a clock
from any of its ports and export it to the other interfaces. If the PEM is installed, the primary
and secondary clocks be recovered from one of the PEM ports.