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Solution of converging 24 E1 services (48x64 kbit's services) into two E1s on the OptiX Metro 1000 V3

Publication Date:  2012-07-24 Views:  51 Downloads:  0
Issue Description
A station used the OptiX Metro 1000 V3 to access 24 E1 services, that is, 48x64 kbit/s services (each E1 containing 2x64 kbit/s services). The customer required the 24 E1 services to be converged into two E1s on the OptiX Metro 1000 V3 (each E1 converging 24x64 kbit/s services) and the two E1 services be transmitted to other stations through the optical fibers.
On the station, the OptiX Metro 1000 V3 had only one FP2D board (accessing 16 Framed E1s) and one N64 board (accessing 2 Framed E1s) that supported the 64 kbit/s service. In addition, the current versions of the OptiX Metro 1000 V3 do not support time division cross-connection. For example, the NE software has a restriction on the configuration of the tributary-to-tributary cross-connection (the source port number and sink port number of the cross-connection must be consistent). Hence, the normal configuration cannot meet the requirement of the customer. A simple and feasible solution must be sought.
      
Alarm Information
None      
Handling Process
An operator converged the 48x64 kbit/s services into E1s 1�2 of the board in slot IU3, and then cross-connected the two 2 Mbit/s services to the board in slot IU5 (OI4D).
Step 1) The operator used the DDN1�DDN16 of the FP2D board in slot IU3 to access 16 E1s, converged the 24x64 kbit/s services of the DDN1�DDN12 into the first E1 of the board in slot IU3, and cross-connected the E1 to the board in slot IU5.
Step 2) The operator used ports 1�7 of the board in slot IU4 to access seven E1s and cross-connected the seven E1s to E1s 1�7 of the board in slot IU2 respectively. The operator then used DDN3 of IU2 to access one E1. Finally, the operator converged the 16x64 kbit/s services from E1s 1�7 of the board in slot IU2 and the DDN3 of the board in IU2 into the 8th E1 of the board in slot IU2.
Step 3) The operator cross-connected the 8th E1 of the board in slot IU2 to the 8th E1 of the board in slot IU3 (with 16x64 kbit/s services), converged the 8x64 kbit/s services from DDN13�DDN16 of the board in slot IU3 and the 16x64 kbit/s services from the 8th E1 of the board in slot IU3 into the 2nd E1 of the board in slot IU3, and finally cross-connected the 2nd E1 of the board in slot IU3 to the board in slot IU5.             
Root Cause
An ordinary tributary board can access Framed and Unframed signals. Hence, tributary boards can be used to access seven Framed E1 services. The FP2D board can be used to access 16 Framed E1 services. The N64 board can be used to access one Framed E1 service. These 24 E1 services can then be converged into two E1s and transmitted to other stations through the optical fibers. In this way, restriction on the configuration of the cross-connection is avoided and the requirement of the customer is met.      
Suggestions
None      

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