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Unable to select concatenated timeslots in MST4 board due to T2000 version limitaion.

Publication Date:  2012-07-25 Views:  65 Downloads:  0
Issue Description

In a certain network comprising of OSN 7500, WE need to configure FC100 Service between Two Nodes. The service configuration of the FC100(VC4-8c) service in the MST 4 board is successful but upon SDH service creation of the SDH service the MST 4 board is unavailable for timeslot selection in the SDH service creation window (as shown in the attached snapshot).


OSN 7500 software version : 5.21.18.50P01
T2000 Software Version : V200R007C03SPC011



Alarm Information
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Handling Process

 

In order to create the SDH service configuration for VC4-8c we follwed the below steps:

Just to check the available capacity on the MST-4 board did the following steps:

1> Changed the level to VC4, but still the MST board was unavailable for selection.
2> Changed the level to VC4-4c, but still the MST board was unavailable for selection.
3> Changed the level to VC4-16c, but still the MST board was unavailable for selection.

Since MST4 was unavailable for all service levels thereforemoved to below step:

4> Changed the Level to Vc4-8c again and this time mannually entered the board Number and the timeslot (as in the attached file) and clicked 'ok'. this time the service creation succeeded and FC100 service created successfully.

The only solution to this problem is the mannual input of timeslots selection for creation of SDH service.



Root Cause


The MST board is a Fibre Channel servie baord and it is specially designed to support FC50,FC100,FC200, FCION, ESCON, DVB-ASI SD-SDI, and HD-SDI services. As per international standard these services are transferred by the GFP-T encapsulation with VCAT concatenation. Therefore the bandwidth bound on the MST4 board is in the form of VC4-4c, VC4-8c or VC4-16c.

While creating the SDH service, the SDH service level should correspond to the Fibre channel service level. In this case the FC100 service is created on the MST-4 board therefore the SDH service should be created on VC4-8c level. However in the service configuration window the MST4 board is unavailable for selection of timeslot as T2000 does not support the selection of contcatenated service timeslot for MST-4 board.



Suggestions

The only solution to this problem is the mannual input of timeslots so for MST4 board do not use the graphical method for timeslot seleciton, use the mannual menthod to enter the board and timeslot in the service creation window.

The service level of the SDH service and the fibre channel service in the MSt4 board should be of the same level (VC4-4c, VC4-8c or VC-16c)



END