FUNDAMENTACIÓN DEL PROYECTO
C.3. RÉGIMEN DE SESIONES
About This Chapter
A clock is the basis for the normal running of NEs. You must congure clocks for all NEs prior to conguring services. In addition, you need to congure clock protection for complex networks.
Prerequisite
NEs and boards must be created.
Context
Follow the process given below to congure NE clocks:
5.1 Setting the NE Clock Source
Before conguring services, you must congure the NE clock source and specify the priority level, to ensure that it is the same clock source traceable by all NEs in the network.
5.2 Setting Clock Source Protection
In complex clock networks, synchronization status message (SSM) or extended SSM protocol prevents the incorrect traceable clock source. After setting a clock source for an NE and specify the clock priority level, you need to enable the SSM or extended SSM protocol to provide protection for clocks.
5.3 Setting Switching Conditions for Clock Sources
If the traceable clock source of an NE is line clock, you can customise switching conditions for the clock source, so that the NE switch to other clocks when the clock source fails and thus services are not affected.
5.4 Setting Clock Source Reversion
When there are multiple clock sources for an NE, set the clock sources to automatic reversion mode, so that the deteriorated clock source becomes the traceable timing reference automatically after it recovers.
5.5 Preventing Clock Signal Degrade
When clock signals are transmitted over 14 or more NEs, frequency offset and drift may occur.
To prevent clock signal degrade, you need to set 2 Mbit/s phase-locked source to optimize the clock signals. For OSN equipment, you can also set 2M Phase-Locked Source External Clock Attributes.
5.6 Setting Clock Source Quality
There may be some unknown clock sources in a complex clock network. You can uniformly dene these clock sources as unavailable clocks so that NEs will not trace wrong clock sources. For clock sources that are allocated to an NE, the NE obtains their quality information automatically. The quality level of clock sources need to be dened only during test and maintenance.
Issue 01 (2006-09-15) Huawei Technologies Proprietary 5-1
5.7 Setting SSM Output
If the synchronization status message (SSM) or extended SSM protocol is enabled, clock signals carry SSM messages automatically. You can inhibit clock sources from sending SSM messages to other clock subnets, to avoid the equipment of different clock subnets affecting one another at the edge of clock networks.
5.8 Switching a Clock Source
When the traceable clock source in a network deteriorates, NEs may not execute a switch on the clock source. You need to switch the clock source manually to prevent clock deterioration from affecting the normal running of NEs.
OptiX iManager T2000
Operator Guide 5 Conguring Clocks
5.1 Setting the NE Clock Source
Before conguring services, you must congure the NE clock source and specify the priority level, to ensure that it is the same clock source traceable by all NEs in the network.
Prerequisite
You must be an NM user with "NE and network operator" authority or higher.
Context
NOTE
To implement clock protection, congure at least two traceable clock sources for the equipment. Usually, tributary clock is not used as the clock source for the equipment.
Procedure
Step 1 Select Conguration > Clock View from the Main Menu.
Step 2 In the Clock View, right-click an NE icon and select Clock Source Priority list.
Step 3 Click Query to query parameter settings.
Step 4 Click Create to display the Add Clock Source dialog box.
Step 5 Select a clock source and click OK. Select more than one clock source by holding the Ctrl key.
Step 6 Optional: If an external clock source is selected, select External Clock Source Mode according to the type of external clock signals. For 2 Mbit/s clocks, specify the bytes to deliver SSM message.
Step 7 Select a clock source, and click or to adjust its priority level. Clock sources are arranged in a descending order. The upmost one is the preferred one for the NE.
NOTE
Internal clock sources have the lowest priority because of its low precision.
Step 8 Click Apply.
A prompt appears telling you that the operation was successful.
Step 9 Click Close.
----End
5.2 Setting Clock Source Protection
In complex clock networks, synchronization status message (SSM) or extended SSM protocol prevents the incorrect traceable clock source. After setting a clock source for an NE and specify the clock priority level, you need to enable the SSM or extended SSM protocol to provide protection for clocks.
Issue 01 (2006-09-15) Huawei Technologies Proprietary 5-3
Prerequisite
You must be an NM user with "NE and network operator" authority or higher.
Procedure
Step 1 Select Conguration > Clock View from the Main Menu.
Step 2 In the Clock View, right-click an NE icon and select Clock Subnet Settings.
Step 3 Click the Clock Subnet tab. Click Query to query the parameter settings.
Step 4 Select Start Standard SSM Protocol or Start Extended SSM Protocol.
Step 5 Set the subnet number of the clock subnet to which the NE is associated. Assign the same subnet number to the NEs that have the same traceable clock source.
NOTE
n Assign subnet number to the NEs with SSM protocol protection. Otherwise, the SSM protocol is not started and incorrect clock source switching is caused.
n When dividing clock subnets, divide the NEs that have the same traceable clock source to the same subnet. The clock source is referred to as subnet clock source. The division of clock subnets complies to the principle of "The clock traceable chain cannot be too long" (not more than 20 NEs), to avoid clock precision degrade.
Step 6 Optional: If the extended SSM protocol is started, set the clock ID of the clock source.
Step 7 Click Apply.
A prompt appears telling you that the operation was successful.
Step 8 Click Close.
Step 9 Optional: If the clock ID is specied for an NE’s line clock, click the Clock ID Status tab, and set the status to Enabled. Click Apply.
----End
5.3 Setting Switching Conditions for Clock Sources
If the traceable clock source of an NE is line clock, you can customise switching conditions for the clock source, so that the NE switch to other clocks when the clock source fails and thus services are not affected.
Prerequisite
You must be an NM user with "NE and network operator" authority or higher.
OptiX iManager T2000
Operator Guide 5 Conguring Clocks
Procedure
Step 1 In the NE Explorer, click the NE and select Conguration > Clock > Clock Source Switching from the Function Tree. Select the Clock Source Switching Condition tab.
Step 2 Click Query to query the parameter settings.
Step 3 Double-click the parameters to set clock switching conditions.
Step 4 Click Apply.
A prompt appears telling you that the operation was successful.
Step 5 Click Close.
----End
5.4 Setting Clock Source Reversion
When there are multiple clock sources for an NE, set the clock sources to automatic reversion mode, so that the deteriorated clock source becomes the traceable timing reference automatically after it recovers.
Prerequisite
You must be an NM user with "NE and network operator" authority or higher.
Procedure
Step 1 Select Conguration > Clock View from the Main Menu.
Step 2 In the Clock View, right-click an NE icon and select Clock Source Reversion Parameter.
Step 3 Double-click and set the reversion mode and the WTR time.
NOTE
It is recommended not to set Clock Source WTR Time(min.) to 0, to avoid repeated switching when the clock is unstable.
Step 4 Click Apply.
A prompt appears telling you that the operation was successful.
Step 5 Click Close.
Step 6 Click Query to query the parameter settings.
Issue 01 (2006-09-15) Huawei Technologies Proprietary 5-5
----End
5.5 Preventing Clock Signal Degrade
When clock signals are transmitted over 14 or more NEs, frequency offset and drift may occur.
To prevent clock signal degrade, you need to set 2 Mbit/s phase-locked source to optimize the clock signals. For OSN equipment, you can also set 2M Phase-Locked Source External Clock Attributes.
Prerequisite
You must be an NM user with "NE and network operator" authority or higher.
Procedure
Step 1 Select Conguration > Clock View from the Main Menu.
Step 2 In the Clock View, right-click an NE icon and select Phase-Locked Source Output by External Clock.
Step 3 Click Query to query parameter settings.
Step 4 Set parameters to the appropriate value.
Step 5 Click Apply.
A prompt appears telling you that the operation was successful.
Step 6 Click Close.
----End
5.6 Setting Clock Source Quality
There may be some unknown clock sources in a complex clock network. You can uniformly dene these clock sources as unavailable clocks so that NEs will not trace wrong clock sources. For clock sources that are allocated to an NE, the NE obtains their quality information automatically. The quality level of clock sources need to be dened only during test and maintenance.
Prerequisite
You must be an NM user with "NE and network operator" authority or higher.
Procedure
Step 1 Select Conguration > Clock View from the Main Menu.
Step 2 Right-click the NE icon in the Clock View. Select Clock Subnet Setting. Select the Clock Quality tab.
Step 3 Click Query to query the parameter settings.
Step 4 Select the Conguration Quality tab and set Conguration Quality to Automatic Extraction.
OptiX iManager T2000
Operator Guide 5 Conguring Clocks
Step 5 Click Apply.
The Operation Result dialog box is displayed and indicates that operation succeeded.
Step 6 Click Close.
Step 7 Select the Manual Setting of 0 Quality Level tab. Set Manual Setting of 0 Quality Level to Synchronous Source Unavailable.
Step 8 Click Apply.
----End
5.7 Setting SSM Output
If the synchronization status message (SSM) or extended SSM protocol is enabled, clock signals carry SSM messages automatically. You can inhibit clock sources from sending SSM messages to other clock subnets, to avoid the equipment of different clock subnets affecting one another at the edge of clock networks.
Prerequisite
You must be an NM user with "NE and network operator" authority or higher.
Procedure
Step 1 Select Conguration > Clock View from the Main Menu.
Step 2 Right-click the NE icon in the Clock View. Select Clock Subnet Settings. Select the SSM Output Control tab.
Step 3 Set the control status of the clock source.
Issue 01 (2006-09-15) Huawei Technologies Proprietary 5-7
Step 4 Click Apply
A prompt appears telling you that the operation was successful.
Step 5 Click Close.
Step 6 Click Query to query the parameter value.
----End
5.8 Switching a Clock Source
When the traceable clock source in a network deteriorates, NEs may not execute a switch on the clock source. You need to switch the clock source manually to prevent clock deterioration from affecting the normal running of NEs.
Prerequisite
You must be an NM user with "NE and network operator" authority or higher.
Procedure
Step 1 Select Conguration > Clock View from the Main Menu.
Step 2 In the Clock View, right-click an NE icon and select Clock Source Switching.
Step 3 Select the Clock Source Switching tab.
Step 4 Click Query to query the switching status of a clock source.
Step 5 Optional: If Lock Status is Lock, right-click and select Unlock.
Step 6 Right-click the clock source that you wish to switch and select a switching operation.
OptiX iManager T2000
Operator Guide 5 Conguring Clocks
NOTE
Before switching the clock source, make sure the new clock source is created in the priority table, of good quality and not locked.
Step 7 To restore to the automatic clock source selection mode, right-click the switched clock source and select Clear Switching.
----End
Issue 01 (2006-09-15) Huawei Technologies Proprietary 5-9
OptiX iManager T2000
Operator Guide 6 Conguring Orderwire