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Cisco Transport Manager Release 6.0 User Guide
78-16845-01
Chapter 3 Building the Network
3.10.1 Synchronization Settings for the ONS 15310, ONS 15327, ONS 15454 SONET, and ONS 15600 SONET
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Timing Mode set to Line—Options are the node’s working OC-N cards (non-DWDM nodes),
OSC cards (DWDM nodes), 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 (span) 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, which allows you to set
a mixture of external BITS and OC-N trunk cards as timing references.
• BITS 1 Out/BITS 2 Out—Define the timing references for equipment wired to the BITS Out
backplane pins. BITS 1 Out and BITS 2 Out are enabled when BITS 1 and BITS 2 facilities are put
in service. If Timing Mode is set to external, choose the OC-N card used to set timing. If Timing
Mode is set to Line, you can choose an OC-N card or choose NE reference to have BITS 1 out and/or
BITS 2 Out follow the same timing reference as the NE.
Step 6 In the Status subtab, complete the following information:
• NE Clock
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NE Reference—Set the NE timing reference to internal, BITS 1, or BITS 2.
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Status—Read only. Displays the status of the NE clock.
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Operations—Execute a switch on the NE timing reference.
• BITS 1 OUT
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BITS 1 Out—Set the BITS 1 Out timing reference.
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Status—Read only. Displays the status of the BITS 1 out timing reference.
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Operations—Execute a switch on the BITS 1 out timing reference.
• BITS 2 OUT
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BITS 2 Out—Set the BITS 2 Out timing reference.
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Status—Read only. Displays the status of the BITS 2 out timing reference.
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Operations—Execute a switch on the BITS 2 out timing reference.
Step 7 In the Timing Report subtab, you can view the timing status report summary for the node.
Step 8 Click Apply.
Note Refer to the relevant ONS 15310, ONS 15327, ONS 15454, or ONS 15600 troubleshooting guide
for timing-related alarms.
3.10.1.2 Setting Up Internal Timing for CTC-Based SONET NEs
If no BITS source is available, set up internal timing by timing all nodes in the ring from the internal
clock of one node.
Caution Internal timing is Stratum 3 and not intended for permanent use. All nodes should be timed to a
Stratum 2 or better primary reference source.