Provisioning TU

Tributary Units (TU) can be provisioned only after TU cross-connects are created. It is possible to retrieve or view the TU parameters only when TU is acting as a protecting member for a connection. The Transmit Trace and Expected Trace field are editable only for add/drop cross-connects. The Expected trace field is not editable for pass through cross-connects.

Perform the steps given below to provision TU.

Click Configuration > Facilities > STM in the navigation pane. The STM Port interface configuration preview pane is displayed.
Click on the desired AU4 link. The Provision AU4 preview pane is displayed.
Click on the desired TU link. The Provision TU preview pane is displayed.
Select or enter value for the desired editable parameters. For more information, refer to TU parameters table given below.
Click Submit. A confirmation message is displayed.
Click Accept Valid Modifications. A 'Successfully Modified' message is displayed.

TU parameters

Parameter	Description	Default Value	Acceptable Value

Signal Label	The payload signal label. The value assigned depends on the cross-connect provisioned. The Signal Label field is made user provisionable to avoid the Signal Label Mismatch in case of connectivity between nodes of multi vendor networks.	Unequipped when there are no cross-connects provisioned	Acceptable values: unequipped equipped_non_specific asynchronous bit_synchronous byte_synchronous test_O181 vc_ais extended
Extended Signal Label	The payload type or the Signal label received on the TU path. The value assigned depends on the cross-connect provisioned. The Extended Signal Label option is ignored for TU-3 and TU-12 pass through cross-connects.	GFP for add drop Ethernet cross-connects	Acceptable values: ATM HDLC_PPP HDLC_LAPS VCAT_TEST GFP
Receive Parameters
Received Signal label	The payload type or signal label received on the TU path. For example, tug structured, asynchronous_container3.	--	--
Transmit Trace	The path transmitted in the TU on J1 byte.	Tejas Networks	The trace can be 16 or 64 characters long.
Transmit Trace Length	The length of the section path trace to be sent.	16	The length can be 16 or 64
Expected trace	The path trace that is expected on the TU path.	Tejas Networks	The trace message can be 16 or 64 characters long.
Expected Trace Length	The length of the expected section path trace.	16	The Length can be 16 or 64.
Received Trace	The TU path trace that is received.	Tejas Networks	--
Signal Fail BER Threshold	Parameter to indicate the threshold for signal fail Bit Error Rates (BER) beyond which alarm is raised.	1e-3	Acceptable values include 1e-3, 1e-4, 1e-5 and Disable. When Disable is selected, no threshold exists for the signal fail BERs and alarms are not raised.
Signal Degrade BER Threshold	Parameter to indicate the threshold for signal degrade Bit Error Rates (BER) beyond which alarm is raised.	1e-6	Acceptable values include 1e-3 to 1e-9 and Disable. When Disable is selected, no threshold exists for the signal degrade BERs and alarms are not raised.
Alarm Reporting Status	Allows you to select the alarm reporting status of the interface. Report: Reports alarms raised on the interface on Active alarms pane. No-Report: Reports alarms raised on the interface on Suppressed alarms pane.	Report	Report No-Report
Path Alarm Profile	Parameter to assign the alarm profile for the Path.	mask TIM	mask TIM suppress TIM mask all except LOP mask all mask TIM_AND_SLM
Performance Monitoring	Performance Monitoring can be enabled or disabled.	Disable	Enable Disable
Transmit Parameters
Transmit Trace	The TU path trace that is received.	Tejas Networks	--
Transmit Trace Length	The length of the transmitted section path trace.	16	The Length can be 16 or 64.

NOTE 1: Presence of unprovisioned TU on the far end node leads to no VCAT overhead transmission. The alarm raised due to the above consequence is Loss of VCAT multiframe on TU.

NOTE 2: If the STM-N ports are provisioned in an MSP configuration, then you need to select the TU for the corresponding work port in order to edit the TU parameters. The settings will be automatically propagated to the protection TU.