Configuring APS for 10G ITU w/ Splitter

[fi72231]

Does anyone have experience on configuring APS for 10G ITU card with Splitter so that in a case of signal degrade it will switchover to the protection path? The default switchover mechanism is based on LOL (Loss-Of-Light) but it wont help if signal degrades for example to -25dB. All experiences and best practices are wellcome.

[a-vazquez]

APS provides protection against signal transmission failure. Cisco supports the following APS features.

1. 1+1 path protection

2. Splitter protection

3. Line card protection and many more .For more information on how to configure APS have a look at the following URL.

http://www.cisco.com/en/US/products/hw/optical/ps2011/products_configuration_guide_chapter09186a008046cf0d.html#wp1061881

[fi72231]

I know the protection schemes (client, splitter, Y-cable etc.) but my question is how to configure splitter protection so that in a case of signal degrease it will do switchover to the protection path.

See below an output from ONS15530:

ONS15530_1>sh aps

AR : APS Role, Wk: Working, Pr: Protection

AS : APS State, Ac: Active, St: Standby, NA: Not Applicable

IS : Interface State, Up: Up, Dn: Down

MPL: Minimum Protection Level, SD: Signal Degrade, SF: Signal Failure

LOX: Loss of Light/Loss of (CDR) Lock/Loss of Frame/Sync,

LOL: Loss of Light, - not currently protected

Interface AR AS IS MPL Redundant Intf Group Name

~~~~~~~~~~~~~~~~~~~~~ ~~ ~~ ~~ ~~~ ~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~

Wavepatch1/0/0 Wk Ac Up LOX Wavepatch1/0/1 CH1

Wavepatch1/0/1 Pr St Up - Wavepatch1/0/0 CH1

________________________________________________

So APS will switch to the protection path only in a case of Loss of Light/Loss of (CDR) Lock/Loss of Frame/Sync. So it WONT do the failover if RX signal level degreases below the minimum RX level (-23dB for 10G ITU card), because there is still light coming (not LOL case). So how do I protect my system against this kind of signal degreade?

rgds,

Jp

[prutter]

Splitter cards trigger their switching mechanism according to the value configured for the low alarm value (not low warning), which you can see here:

http://www.cisco.com/en/US/partner/products/hw/optical/ps2011/products_configuration_guide_chapter09186a008046cad3.html#wp1083657

You can't do full performance monitoring-based protection with splitter protection, because you'd need two monitoring devices (one for active path, one for standby path) hence two receivers (=2xtransponder). The receiver protection switch is before the receiver to optimise costs with a single receiver.

Hope this helps.

p.

[fi72231]

Problem that I had, was that RX power went to -25dB and ITU card didn't do the switchover. I know that ITU card SHOULD do the failover when RX power goes below -22dB - but it didn't. So to be on the safe side on future, I was wondering if someone has configured threshold triggers, like in the doc/url below:

http://www.cisco.com/univercd/cc/td/doc/product/mels/15530/12_2_sv/config2/hcg_trnk.htm#wp1033760

regards,

Jp

[fi72231]

I got an answer from a colleaque, there is a BUG: CSCsc48011 opened for this issue.