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Cisco ONS 15454 Installation and Operations Guide
November 2001
Chapter 3 Node Setup
Setting Up ONS 15454 Timing
–
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.
–
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 timing references.
• BITS 1 Out/BITS 2 Out—Define the timing references for equipment wired to the BITS Out
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.
Figure 3-9 Setting Up ONS 15454 timing
Step 5
Click Apply.
Note Refer to the Cisco ONS 15454 Troubleshooting and Maintenance Guide for timing-related
alarms.