Hi!
I would like to share this experience with community members.
We have a big SDH network that works mainly in OSN 7500. we still use the U2000 management program.
I was making the swap for E1&E3 services using the ((Service Configuration )) when I the NE gave me a reply:
.PNG)
The NE has the cross-connect board (UXCSA)
I went to check the Cross-Connect Board low order cross-connect usage from the path
Inventory > SDH_Report > Lower Order Cross-Connections Statistic Report
There I could find the capacity & the usage of the board and I found that we used all available 128 VC4 used for low order services, as in the following picture:
.PNG)
I discovered that we have a shortage in the low order cross-connection traffic means the traffic in VC12 & VC3 order, While we still have a big capacity for High order cross-connection.
And because I had a traffic swap, I needed a temporary solution.
1. The temporary solution
I looked for the VC12 & VC3 services (passthrough) going from a Line board to another line board in a group of VC12 or VC3, I found many services going in consequence as in the following picture.
I deleted these services and recreate passthrough service in VC4 level (that will cause cut for deleted services for seconds ) then the service will be as in the following picture
I could reduce the number of used low order cross-connect with 14 * VC4 and then, I went to check the Cross-Connect Board low order cross-connect usage from the path
Inventory > SDH_Report > Lower Order Cross-Connections Statistic Report and it was as in the following picture :
.PNG)
Then I could make the service swap.
2. The permeant solution was by replacing the Cross-connect board with other which has bigger capacity.
I searched for available boards and their capabilities.
Board | Low order capacity | High order capacity | Access capacity |
GXCSA | Lower order cross-connect capacity: 20 Gbit/s | Higher order cross-connect capacity: 240 Gbit/s | Access capacity: 200 Gbit/s
|
EXCSA | Lower order cross-connect capacity: 40 Gbit/s | Higher order cross-connect capacity: 240 Gbit/s | Access capacity: 200 Gbit/s
|
UXCSA | Lower order cross-connect capacity: 20 Gbit/s | Higher order cross-connect capacity: 360 Gbit/s | Access capacity: 280 Gbit/s |
SXCSA | Lower order cross-connect capacity: 40 Gbit/s | Higher order cross-connect capacity: 360 Gbit/s | Access capacity: 280 Gbit/s
|
IXCSA | Lower order cross-connect capacity: 80 Gbit/s | Higher order cross-connect capacity: 360 Gbit/s | Access capacity: 280 Gbit/s |
The old board was UXCSA, So we change the board with the type IXCSA to have 4 times the capacity of the UXCSA in the low order services cross-connect.
When changing the board with the higher capacity board, you need only to replace the standby board than wait until it works normally then replace the main.
I hope to be useful to all.
Best Regards
