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Cisco ONS 15454 Installation and Operations Guide
November 2001
Chapter3 Node Setup
Setting Up ONS 15454 Timing
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Timing Mode set to Line—options are the node’s working optical cards and Internal Clock.
Select the cards/ports that are directly or indirectly connected to the node wired to the BITS
source, that is, the node’s trunk cards. Set Reference 1 to the trunk card that is closest to the
BITS source. For example, if Slot 5 is connected to the node wired to the BITS source, select
Slot 5 as Reference 1.
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Timing Mode set to Mixed—both BITS and optical cards are available, allowing you to set a
mixture of external BITS and optical trunk cards as ti ming re f eren ces.
•BITS 1 Out/BITS 2 Out—Define the timing references for equipment wired to the BITS Ou t
backplane pins. Normally, BITS Out is used with Line nodes, so the options displayed are the
working optical cards. BITS 1 and BITS 2 Out are enabled as soon as BITS-1 and BITS-2 facilities
are placed in service.
Figure3-9 Setting Up ONS 15454 timing
Step 5 Click Apply.
Note Refer to the Cisco ONS 15454 Troubleshooting and Maintenance Guide for timing-related
alarms.