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Contents
- Introduction
- Node Timing Parameters
- Network Timing
- Synchronization Status Messaging
- Procedures for ONS 15454 Timing
- NTP-G53 Set Up Timing
- DLP-G95 Set Up External or Line Timing
- DLP-G96 Set Up Internal Timing
- NTP-G87 Change Node Timing Parameters
- NTP-G112 Change the Node Timing Reference
- DLP-G259 Manual or Force Switch the Node Timing Reference
- DLP-G260 Clear a Manual or Force Switch on a Node Timing Reference
- NTP-G113 View the ONS 15454 Timing Report
- Trademark Notice
- Obtaining Documentation and Submitting a Service Request
Introduction
This document provides information about Cisco ONS 15454 users and node timing. To provision timing, refer to the Cisco ONS 15454 DWDM Configuration Guide.
Note
Unless otherwise specified, “ONS 15454” refers to both ANSI and ETSI shelf assemblies.The document contains the topics mentioned below.
- Node Timing Parameters
- Network Timing
- Synchronization Status Messaging
- Procedures for ONS 15454 Timing
- Trademark Notice
- Obtaining Documentation and Submitting a Service Request
Node Timing Parameters
SONET timing parameters must be set for each Cisco ONS 15454 shelf. Each ONS 15454 independently accepts its timing reference from one of three sources:
- The building integrated timing supply (BITS) pins on the ONS 15454 backplane (ANSI) or MIC-C/T/P coaxial connectors (ETSI).
- An OC-N/STM-N card installed in the ONS 15454. The card is connected to a node that receives timing through a BITS source.
- The internal ST3 clock on the TCC2/TCC2P/TCC3/TNC/TNCE/TSC/TSCE card.
You can set ONS 15454 timing to one of three modes: external, line, or mixed. If timing is received from a BITS source, set ONS 15454 timing to external. If timing is received from an OC-N/STM-N card, set the timing to line. The BITS connection on Cisco ONS 15454 M6 shelf is through the external connection unit (ECU) and is through the power module on Cisco ONS 15454 M2 shelf.
In typical ONS 15454 networks:
- One node is set to external. The external node derives its timing from a BITS source wired to the BITS backplane pins. The BITS source, in turn, derives its timing from a primary reference source (PRS) such as a Stratum 1 clock or global positioning satellite (GPS) signal.
- The other nodes are set to line. The line nodes derive timing from the externally timed node through the OC-N/STM-N trunk (span) cards. The DWDM node normally derives timing from the line using the OSCM or OSC-CSM card that are inside an OC-3/STM-1 channel.
You can set three timing references for each ONS 15454. The first two references are typically two BITS-level sources, or two line-level sources optically connected to a node with a BITS source. The third reference is usually assigned to the internal clock provided on every ONS 15454 TCC2/TCC2P/TCC3/TNC/TNCE/TSC/TSCE card. However, if you assign all three references to other timing sources, the internal clock is always available as a backup timing reference. The internal clock is a Stratum 3 (ST3), so if an ONS 15454 node becomes isolated, timing is maintained at the ST3 level.
The CTC Maintenance > Timing > Report tab show current timing information for an ONS 15454, including the timing mode, clock state and status, switch type, and reference data.
Caution
Mixed timing allows you to select both external and line timing sources. However, Cisco does not recommend its use because it can create timing loops. Use this mode with caution.The OC3 port of the TNC/TNCE/TSC/TSCE card can be set as the timing reference. In the ONS 15454 M2 shelf, BITS-2 is not supported.
Network Timing
The following figure shows an ONS 15454 network timing setup example. Node 1 is set to external timing. Two timing references are set to BITS. These are Stratum 1 timing sources wired to the BITS input pins on the Node 1 backplane. The third reference is set to internal clock. The BITS output pins on the backplane of Node 3 are used to provide timing to outside equipment, such as a digital access line access multiplexer.
In the example, Slots 5 and 6 contain the trunk (span) cards. Timing at Nodes 2, 3, and 4 is set to line, and the timing references are set to the trunk cards based on distance from the BITS source. Reference 1 is set to the trunk card closest to the BITS source. At Node 2, Reference 1 is set to Slot 5 because it is connected to Node 1. At Node 4, Reference 1 is set to Slot 6 because it is connected to Node 1. At Node 3, Reference 1 could be either trunk card because they are at an equal distance from Node 1.
Synchronization Status Messaging
Synchronization status messaging (SSM) is a SDH and SONET protocol that communicates information about the quality of the timing source. SSM messages are carried on the S1 byte of the SONET Line layer or on S1 byte of the SDH section overhead. They enable SONET or 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 or the ONS 15454 SDH, consult your timing reference documentation to determine which message set to use.
The following table shows the SDH message set.
The following two tables show the Generation 1 and Generation 2 message sets for SONET.
Table 2 SSM Generation 1 Message Set Message
Quality
Description
PRS
1
Primary reference source—Stratum 1
STU
2
Synchronization traceability unknown
ST2
3
Stratum 2
ST3
4
Stratum 3
SMC
5
SONET minimum clock
ST4
6
Stratum 4
DUS
7
Do not use for timing synchronization
RES
—
Reserved; quality level set by user
Table 3 SSM Generation 2 Message Set Message
Quality
Description
PRS
1
Primary reference source—Stratum 1
STU
2
Synchronization traceability unknown
ST2
3
Stratum 2
TNC
4
Transit node clock
ST3E
5
Stratum 3 E
ST3
6
Stratum 3
SMC
7
SONET minimum clock
ST4
8
Stratum 4
DUS
9
Do not use for timing synchronization
RES
—
Reserved; quality level set by user
Procedures for ONS 15454 Timing
- NTP-G53 Set Up Timing
- NTP-G87 Change Node Timing Parameters
- NTP-G112 Change the Node Timing Reference
- NTP-G113 View the ONS 15454 Timing Report
NTP-G53 Set Up Timing
Procedure
Purpose
This procedure provisions Cisco ONS 15454 timing.
Tools/Equipment
None
Prerequisite Procedures
"NTP-G51 Verify DWDM Node Turn Up" procedure in "Turn Up a Network" chapter of the Cisco ONS 15454 DWDM Configuration Guide
"DLP-G46 Log into CTC" task in Connect the PC and Log into the GUI document.
Required/As Needed
Required
Onsite/Remote
Onsite or remote
Security Level
Provisioning or higher
Step 1 Complete the DLP-G95 Set Up External or Line Timing task if an external building integrated timing supply (BITS) source is available. This is the most common ONS 15454 timing setup method. Step 2 If an external BITS source is not available, complete the DLP-G96 Set Up Internal Timing task. This task can provide only Stratum 3 timing. Step 3 Repeat this procedure at each node in the network.
What to Do NextStop. You have completed this procedure.
DLP-G95 Set Up External or Line Timing
Procedure
Purpose
This task defines the ONS 15454 timing source (external or line).
Tools/Equipment
None
Prerequisite Procedures
"DLP-G46 Log into CTC" task in Connect the PC and Log into the GUI document.
Required/As Needed
Required
Onsite/Remote
Onsite or remote
Security Level
Provisioning or higher
Step 1 In node view (single-node mode) or shelf view (multishelf mode), click the Provisioning > Timing > General tabs. Step 2 In the General Timing area, complete the following information:
- Timing Mode-Choose External if the ONS 15454 derives its timing from a BITS source wired to the backplane pins (ANSI) or a MIC-C/T/P front-mount electrical connection (FMEC) (ETSI); choose Line if timing is derived from an OSC-CSM or OSCM card that is optically connected to the timing node. A third option, Mixed, allows you to set both external and line timing references. Because Mixed timing might cause timing loops, we do not recommend its use. Use this mode with care.
Note In ONS 15454 M6 the BITS is connected to ECU or ECU2 BITS Connectors. Refer to "DLP-G296 Install Timing Wires on ONS 15454 M6 - ANSI" in the Cisco ONS 15454 Hardware Installation Guide. In ONS 15454 M2 the BITS is connected to BITS connectors on the Power Unit.
- SSM Message Set-Choose the Generation 2 synchronization status messaging (SSM) option. See the section Synchronization Status Messaging for more information about SSM, including definitions of the SONET timing levels.
Note Generation 1 is used only by SONET or SDH ONS 15454 nodes that are connected to equipment that does not support Generation 2.
- Quality of RES-Sets the timing quality for the user-defined, reserved (RES) S1 byte if your timing sources supports RES. Most timing sources do not use RES. If it does not support RES, choose RES=DUS (do not use for timing reference). Qualities are displayed in descending quality order as ranges. For example, in Generation 1 SSM, ST3<RES<ST2 means that the timing reference RES is higher than a Stratum 3 (ST3) and lower than a Stratum 2 (ST2)
- Revertive-Select this check box if you want the ONS 15454 to revert to a primary reference source after the conditions that caused it to switch to a secondary timing reference are corrected.
- Reversion Time-If Revertive is checked, choose the amount of time that the ONS 15454 will wait before reverting to its primary timing source. Five minutes is the default.
Step 3 In the Reference Lists area, complete the following information:
Note You can define up to three timing references for the node and up to six BITS Out references. BITS Out references define the timing references used by equipment that can be attached to the node's BITS Out pins on the backplane (ANSI) or the MIC-C/T/P FMEC (ETSI). If you attach equipment to BITS Out pins, you normally attach it to a node with Line mode, because equipment near the external timing reference can be directly wired to the reference.
- NE Reference-Allows you to define three timing references (Ref 1, Ref 2, Ref 3). The node uses Reference 1 unless a failure occurs to that reference, in which case the node uses Reference 2. If Reference 2 fails, the node uses Reference 3, which is typically set to Internal Clock. Reference 3 is the Stratum 3 clock provided on the TCC2/TCC2P/TCC3/TNC/TNCE/TSC/TSCE card. The options that appear depend on the Timing Mode setting.
- If the Timing Mode is set to External, your options are BITS-1, BITS-2, and Internal Clock.
- If the Timing Mode is set to Line, your options are the node's working OSCM cards, OSC-CSM cards, transponder (TXP) cards, muxponder (MXP) cards, and Internal Clock. Choose the cards or ports that are directly or indirectly connected to the node wired to the BITS source. Set Reference 1 to the card that is closest to the BITS source. For example, if Slot 5 is connected to the node wired to the BITS source, choose Slot 5 as Reference 1.
- If the Timing Mode is set to Mixed, both BITS references and the OSCM, OSC-CSM, TXP, or MXP cards are available, allowing you to set a mixture of external BITS clocks and OSCM, OSC-CSM, TXP, or MXP cards as timing references.
- BITS-1 Out/BITS-2 Out-Sets the timing references for equipment wired to the BITS Out backplane (ANSI) or MIC-C/T/P FMEC (ETSI) pins. BITS-1 Out and BITS-2 Out are enabled when BITS-1 Out and BITS-2 Out facilities are put in service. If Timing Mode is set to external, choose the OSCM, OSC-CSM, TXP, or MXP card used to set the timing. If Timing Mode is set to Line, you can choose an OSCM, OSC-CSM, TXP, or MXP card or choose NE Reference to have the BITS-1 Out, BITS-2 Out, or both, follow the same timing references as the network element (NE).
Note All TXP or MXP card client ports are available for timing regardless of the card's termination mode. TXP or MXP trunk ports can be a timing reference when ITU-T G.709 is set to OFF and the Termination Mode is set to LINE. You cannot choose TXP_MR_2.5G and OTU2_XP card client ports as a timing reference.
Note The system prevents BITS In and BITS Out timing to be set on the same node.
Step 4 Click Apply . Step 5 Click the BITS Facilities tab.
Note The BITS Facilities section sets the parameters for your BITS-1 and BITS-2 timing references. Many of these settings are determined by the timing source manufacturer. If equipment is timed through BITS Out, you can set timing parameters to meet the requirements of the equipment.
Step 6 In the BITS In area, complete the following information:
- Facility Type-(TCC2P/TNC/TNCE/TSC/TSCE only) Choose the BITS signal type supported by your BITS clock, either DS1 or 64KHz+8KHz.
- BITS In State-If Timing Mode is set to External or Mixed, set the BITS In state for BITS-1, BITS-2, or both, to IS (in service) depending on whether one or both BITS input pin pairs are connected to the external timing source. If Timing Mode is set to Line, set the BITS In state to OOS (out of service).
Step 7 If the BITS In state is set to OOS, continue with Step 8. If the BITS In state is set to IS, complete the following information:
- Coding-Choose the coding used by your BITS reference, either B8ZS (binary 8-zero substitution) or AMI (alternate mark inversion).
- Framing-Choose the framing used by your BITS reference, either ESF (Extended Super Frame) or SF (D4) (Super Frame).
- Sync Messaging-Check this check box to enable SSM. SSM is not available if Framing is set to Super Frame.
- Admin SSM-If the Sync Messaging check box is not checked, you can choose the SSM Generation 2 type from the drop-down list. Choices are PRS (Primary reference source; Stratum 1), ST2 (Stratum 2), TNC (Transit Node Clock), ST3E (Stratum 3E), ST3 (Stratum 3), SMC (SONET minimum clock), and ST4 (Stratum 4).
Step 8 In the BITS Out area, complete the following information, as needed:
- Facility Type-(TCC2P/TNC/TNCE/TSC/TSCE only) Choose the BITS Out signal type, either DS1 or 64KHz+8KHz for ANSI and E1, 2Mhz, or 64Khz for ETSI.
- BITS Out state-If equipment is connected to the node's BITS output pins on the backplane (ANSI) or MIC-C/T/P FMEC (ETSI) and you want to time the equipment from a node reference, set the BITS Out state for BITS-1, BITS-2, or both, to IS , depending on which BITS Out pins are used for the external equipment. If equipment is not attached to the BITS output pins, set the BITS Out state to OOS .
Step 9 If the BITS Out state is set to OOS, continue with Step 10. If the BITS Out state is set to IS, complete the following information:
- Coding-Choose the coding used by your BITS reference, either B8ZS, AMI, or HDB3.
- Framing-Choose the framing used by your BITS reference, either ESF, SF (D4), or FAS+CAS+CRC.
- AIS Threshold-If SSM is disabled or Super Frame is used, choose the quality level where a node sends an alarm indication signal (AIS) from the BITS 1 Out and BITS 2 Out backplane pins (ANSI) or MIC-C/T/P FMEC (ETSI). An AIS alarm is raised when the optical source for the BITS reference falls to or below the SSM quality level defined in this field.
- LBO-If an external device is connected to the BITS Out pins, set the line build-out (LBO) distance between the ONS 15454 and an external device. If an external device is connected to BITS Out, choose the distance between the device and the ONS 15454. Options are: 0-133 ft (default), 134-266 ft, 267-399 ft, 400-533 ft, and 534-655 ft. Line build out (LBO) relates to the BITS cable length. If an external device is not connected to BITS Out, leave this field set to the default.
Step 10 Click Apply.
Note Refer to Cisco ONS 15454 DWDM Troubleshooting Guide for timing-related alarms.
Step 11 Return to your originating procedure (NTP).
DLP-G96 Set Up Internal Timing
Procedure
Purpose
This task sets up internal timing (Stratum 3) for an ONS 15454.
Tools/Equipment
None
Prerequisite Procedures
"DLP-G46 Log into CTC" task in Connect the PC and Log into the GUI document.
Required/As Needed
As needed (use only if a BITS source is not available)
Onsite/Remote
Onsite or remote
Security Level
Provisioning or higher
CautionInternal timing is Stratum 3 and is not intended for permanent use. All ONS 15454 SONET (ANSI) or SDH (ETSI) nodes should be timed to a Stratum 2 (or better) primary reference source. Internal timing is appropriate for DWDM nodes.
NTP-G87 Change Node Timing Parameters
Procedure
Purpose
This procedure changes the timing parameters for the ONS 15454. To switch the timing reference, see the NTP-G112 Change the Node Timing Reference procedure.
Tools/Equipment
None
Prerequisite Procedures
"DLP-G46 Log into CTC" task in Connect the PC and Log into the GUI document.
Required/As Needed
As needed
Onsite/Remote
Onsite or remote
Security Level
Provisioning or higher
CautionThe following procedure might be service affecting and should be performed during a scheduled maintenance window.
Step 1 Complete the "NTP-G103 Back Up the Database" procedure in the chapter, "Maintain the Node" of the Cisco ONS 15454 DWDM Configuration Guide. Step 2 Click the Provisioning > Timing > General tabs. Step 3 In the General Timing section, change any of the following information:
- Timing Mode
Note Because mixed timing can cause timing loops, Cisco does not recommend using the Mixed Timing option. Use this mode with care. Because mixed timing can cause timing loops, Cisco does not recommend using the Mixed Timing option. Use this mode with care.
- SSM Message Set
- Quality of RES
- Revertive
- Revertive Time
See the NTP-G53 Set Up Timing task for field descriptions.
Step 4 In the Reference Lists area, you can change the following information:
Note Reference lists define up to three timing references for the node and up to six BITS Out references. BITS Out references define the timing references used by equipment that can be attached to the node's BITS Out pins on the backplane. If you attach equipment to BITS Out pins, you normally attach it to a node with Line mode because equipment near the external timing reference can be directly wired to the reference.
Step 5 In node view (single-shelf mode) or shelf view (multishelf mode), click the Provisioning > Timing > BITS Facilities tabs. Step 6 In the BITS In section, you can change the following information:
Note The BITS Facilities section sets the parameters for your BITS1 and BITS2 timing references. Many of these settings are determined by the timing source manufacturer. If equipment is timed through BITS Out, you can set timing parameters to meet the requirements of the equipment.
Step 7 In the BITS Out section, you can change the following information: Step 8 Click Apply. Confirm that the changes appear.
Caution Internal timing is Stratum 3 and is not intended for permanent use. All ONS 15454s should be timed to a Stratum 2 or better primary reference source.
Step 9 Complete the "NTP-G103 Back Up the Database" procedure in the chapter, "Maintain the Node" of the Cisco ONS 15454 DWDM Configuration Guide.
Stop. You have completed this procedure.
NTP-G112 Change the Node Timing Reference
Procedure
Purpose
This procedure enables automatic timing reference switching or returns the node timing to normal operation.
Tools/Equipment
None
Prerequisite Procedures
"DLP-G46 Log into CTC" task in Connect the PC and Log into the GUI document.
Required/As Needed
As needed
Onsite/Remote
Onsite or remote
Security Level
Maintenance or higher
Step 1 Complete the DLP-G259 Manual or Force Switch the Node Timing Reference task as needed. Step 2 Complete the DLP-G260 Clear a Manual or Force Switch on a Node Timing Reference task as needed.
Stop. You have completed this procedure.
DLP-G259 Manual or Force Switch the Node Timing Reference
Procedure
Purpose
This task commands the node to switch to the timing reference you have selected.
Tools/Equipment
None
Prerequisite Procedures
"DLP-G46 Log into CTC" task in Connect the PC and Log into the GUI document.
Required/As Needed
As needed
Onsite/Remote
Onsite or remote
Security Level
Maintenance or higher
Step 1 In node view (single-shelf mode) or shelf view (multishelf mode), click the Maintenance > Timing > Source tabs. Step 2 From the Reference drop-down list for the desired Clock, choose the desired reference. Step 3 From the Operation drop-down list for the desired Clock, choose one of the following options:
- Manual -This operation commands the node to switch to the reference you have selected if the synchronization status message (SSM) quality of the reference is not lower than the current timing reference.
- Force-This operation commands the node to switch to the reference you have selected, regardless of the SSM quality (if the reference is valid).
Note For information about the Clear option, see the DLP-G260 Clear a Manual or Force Switch on a Node Timing Reference task.
Step 4 Click Apply next to the timing source. Step 5 Click Yes in the confirmation dialog box. If the selected timing reference is an acceptable valid reference, the node switches to the selected timing reference. If the selected timing reference is invalid, a warning dialog box appears. Click OK; the node will not switch to the new timing reference. Step 6 Return to your originating procedure (NTP).
DLP-G260 Clear a Manual or Force Switch on a Node Timing Reference
Procedure
Purpose
This task clears a Manual or Force switch on a node timing reference and reverts the timing reference to its provisioned reference.
Tools/Equipment
None
Prerequisite Procedures
"DLP-G46 Log into CTC" task in Connect the PC and Log into the GUI document.
Required/As Needed
As needed
Onsite/Remote
Onsite or remote
Security Level
Maintenance or higher
NTP-G113 View the ONS 15454 Timing Report
Procedure
Purpose
This procedure displays the current status of the ONS 15454 timing references.
Tools/Equipment
None
Prerequisite Procedures
"DLP-G46 Log into CTC" task in Connect the PC and Log into the GUI document.
Required/As Needed
As needed
Onsite/Remote
Onsite or remote
Security Level
Maintenance or higher
Step 1 In node view (single-shelf mode) or shelf view (multishelf mode), click the Maintenance > Timing > Report tabs. Step 2 In the Timing Report area, you can view node timing information. The date and time of the report appear at the top of the report. The time stamp is the same as the alarms time stamp and can be configured using the DLP-G118 Display Alarms and Conditions Using Time Zone task in the Alarm and TCA Monitoring and Management document. Step 3 To update the report, click Refresh. The following table describes the report fields and entries.
Table 4 ONS 15454 Timing Report Item
Description
Option
Option Description
Clock
Indicates the timing clock. The report section that follows applies to the timing clock indicated.
NE
The node timing clock.
BITS-1 Out
BITS-2 Out
BITS-2 Out
The BITS-2 Out timing clock.
Status
Indicates the status of the timing clock.
INIT_STATE
The timing reference has not been provisioned. For an NE reference, this status appears just before the first provisioning messages when the TCC2/TCC2P/TCC3/TNC/TNCE/TSC/TSCE card is booting. Timing is provisioned to the internal clock of the node.
HOLDOVER_STATE
The clock was locked onto a valid timing reference for more than 140 seconds when a failure occurred. Holdover state timing is a computation based on timing during the normal state combined with the node's internal clock. The node holds onto this frequency until the valid reference is restored. This status appears for NE references only.
FREERUN_STATE
The node is running off its internal clock without any modification except the calibrated value to bring timing to 0 PPM. Freerun state can occur when a Force switch to the Internal clock is initiated, when all references fail without the 140 seconds of holdover data, or when only Internal timing references are defined. This status appears for NE references only.
NO_SYNC_STATE
A synchronization timing reference is not defined. BITS-1 Out or BITS-2 Out default to this status until an OC-N/STM-N card is defined as its reference on the Provisioning > Timing tab. This status appears for external references only.
NE_SYNCH_STATE
BITS-1 Out and BITS-2 Out use the same timing source as the NE. This is displayed when NE Reference is selected in the BITS-1 Out and BITS-2 Out Reference List on the Provisioning > Timing tab.
NORMAL_STATE
The timing reference is locked onto one of its provisioned references. The reference cannot be Internal or NO SYNC STATE.
FAST_START_STATE
The node has switched references, but the reference is too far away to reach NORMAL_STATE within an acceptable amount of time. FAST_START_STATE is a fast acquisition mode to allow the node to quickly acquire the reference. After it achieves this goal, the node progresses to NORMAL_STATE.
FAST_START_FAILED_STATE
A timing reference is too far away to reach in normal state. The FAST_START_STATE could not acquire sufficient timing information within the allowable amount of time.
Status Changed At
Date and time of the last status change.
-
-
Switch Type
Type of switch.
AUTOMATIC
The timing switch was system-generated.
Manual
The timing switch was a user-initiated Manual switch.
Force
The timing switch was user-initiated Force switch.
Reference
Indicates the timing reference.
Three timing references are available on the Provisioning > Timing tab.
-
Selected
Indicates whether the reference is selected.
Selected references are indicated with an X.
-
Facility
Indicates the timing facility provisioned for the reference on the Provisioning > Timing tab.
BITS-1
The timing facility is a building integrated timing supply (BITS) clock attached to the node's BITS-1 pins.
BITS-2
The timing facility is a BITS clock attached to the node's BITS-2 pins.
OC-N/STM-N card with port number
If the node is set to line timing, this is the OC-N/STM-N card and port provisioned as the timing reference.
Internal clock
The node is using its internal clock.
State
Indicates the timing reference state.
IS
The timing reference is in service.
OOS
The timing reference is out of service.
Condition
Indicates the timing reference state.
OKAY
The reference is valid to use as a timing reference.
OOB
Out of bounds; the reference is not valid and cannot be used as a timing reference, for example, a BITS clock is disconnected.
Condition Changed
Indicates the date and time of the last status change in MM/DD/YY HH:MM:SS format.
-
-
SSM
Indicates whether SSM is enabled for the timing reference.
Enabled
SSM is enabled.
Disabled
SSM is not enabled.
SSM Quality
Indicates the SSM timing quality.
8 to 10 SSM quality messages might be displayed.
For a list of SSM message sets, see Timing Reference chapter.
SSM Changed
Indicates the date and time of the last SSM status change in MM/DD/YY HH:MM:SS format.
-
-
Stop. You have completed this procedure.
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