Cisco Systems 78-16845-01 manual Setting Up External or Line Timing for CTC-Based SDH NEs

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Chapter 3 Building the Network

3.10.2 Synchronization Settings for the ONS 15454 SDH and ONS 15600 SDH

3.10.2 Synchronization Settings for the ONS 15454 SDH and ONS 15600 SDH

SSM communicates information about the quality of the timing source. SSM messages are carried on the S1 byte of the SDH section overhead. These messages enable SDH devices to automatically select the highest quality timing reference and to avoid timing loops.

SSM messages are either Generation 1 or Generation 2. Generation 1 is the first and most widely deployed SSM message set. Generation 2 is a newer version. If you enable SSM for the ONS 15454 SDH, consult your timing reference documentation to determine which message set to use. Table 3-20shows the SDH message set.

Table 3-20	SDH SSM Message Set

Message		Quality	Description

G811		1	Primary reference clock

STU		2	Synchronization traceability unknown

G812T		3	Transit node clock traceable

G812L		4	Local node clock traceable

SETS		5	Synchronous equipment

DUS		6	Do not use for timing synchronization

Note Alarms relating to PM collection indicate that the load on the system is high. Reduce the load on the system before proceeding.

3.10.2.1 Setting Up External or Line Timing for CTC-Based SDH NEs

Step 1 Select an ONS 15454 SDH or ONS 15600 SDH NE and choose Configuration > NE Explorer.

Step 2 In the node property pane, select the Timing tab. Fields shown depend on the NE that is selected.

Step 3 In the General Timing section of the General subtab, complete the following information:

•Timing Mode

–For the ONS 15454 SDH:

Choose External if the ONS 15454 SDH NE derives its timing from an MIC-C/T/P FMEC; choose Line if timing is derived from an STM-N card (non-DWDM node) or OSC card (DWDM node) that is optically connected to the timing node. A third option, Mixed, allows you to set external and line timing references.

–For the ONS 15600 SDH:

Choose External if the ONS 15600 SDH NE derives its timing from a BITS source wired to the backplane; choose Line if timing is derived from an STM-N card that is optionally connected to the timing node. A third option, Mixed, allows you to set external and line timing references.

Caution Because mixed timing may cause timing loops, Cisco does not recommend its use. Use this mode with care.

Cisco Transport Manager Release 6.0 User Guide

3-60	78-16845-01

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Contents Building the Network OverviewHow Do I Build Groups? Adding GroupsCopying Groups Field DescriptionMoving Groups Deleting GroupsDeleting a Single Group How Do I Build Network Partitions? Adding Network PartitionsDeleting Multiple Groups Modifying Network Partitions Deleting Network PartitionsHow Do I Build Subnetworks? Adding SubnetworksHow Do I Build NEs? Moving SubnetworksDeleting Subnetworks Prerequisites for Adding NEs Prerequisites for Adding ONS 15216 EDFA2 or EDFA3 NEsPrerequisites for Adding ONS 15302 and ONS 15305 NEs Building the Network Prerequisites for Adding NEs Hostnames and IP Addresses Required An Efficient Network Topology Setup Prerequisites for Adding ONS 1580x NEs Prerequisites for Adding Cisco CRS-1 and XR 12000 NEsPrerequisites for Adding Cisco Catalyst 6509 NEs Prerequisites for Adding Cisco MGX Voice Gateway DevicesSetting Up Nonstandard Community Strings Option DescriptionChanging the Service-Level Passwords Using the CLI Adding NEs Adding a Single NENE ID Adding Multiple NEs NE ID- Read-onlyField Descriptions for the Add New NE Wizard NE Properties Panel Not selectable if Automatic subnetwork Grouping is enabled Copying an NE from One Group to Another Moving an NE from One Group to AnotherMoving an NE from One Network Partition to Another Automatically Grouping NEs in SubnetworksDeleting NEs Deleting a Single NEDeleting Multiple NEs Removing a Deleted NE How Do I Build Links? Restoring a Deleted NESearching for an NE Overview of Supported Links ONS 15454 Sonet NE Model NE Card Physical LayerOPT-BST ONS 15600 Sonet Viewing the Link Table File10describes the fields in Link table Field Description Filtering the Link Table Filtering Links in the Network MapCreating Links Building the Network Creating Links 12 Field Descriptions for the Create Link Wizard Field Descriptions for the Create Link Wizard Modifying Links FieldLink Type Link Validity Link Color 14 Field Descriptions for the Modify Link Wizard Deleting Links Viewing Link UtilizationFiltering the Link Utilization Table Column DescriptionHow Do I Use Network Maps? Customizing a Network MapPayload Type Description Click UI Properties Adjusting the Zoom Level or Pan Position Viewing a Node in the Network MapModifying a Node Icon or a Map Background Image Modifying a Node IconModifying a Map Background Saving Changes to the Network Map Discovering CTC-Based NEs Discovering ONS 155xx NEsDiscovery Information Table Rediscovering ONS 155xx, CRS-1, and XR 12000 NEs Time stampResetting the Resync Interval How Do I Discover the Network for MGX Voice Gateway Devices? Discovering NEs Message Quality DescriptionSetting Up External or Line Timing for CTC-Based Sonet NEs Building the Network Setting Up Internal Timing for CTC-Based Sonet NEs Bits 1 OUTOOS Setting Up External or Line Timing for CTC-Based SDH NEs Unframed , FAS , FAS + CAS Bits 1 OUT Setting Up Internal Timing for CTC-Based SDH NEs Viewing Clocking Sources Configuring Global Clocking Displaying the List of Available Clock SourcesDisplaying the List of Manual Clock Sources How Do I Test Connectivity for Optical and Routing Devices? Creating a Manual Clock SourceMethod Description Testing NE Connectivity How Do I Test Connectivity for MGX Voice Gateway Devices?Pinging an NE Cisco Transport Manager Release 6.0 User Guide 78-16845-01

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