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Cisco ONS 15310-MA SDH Reference Manual, Release 9.1 and Release 9.2
78-19417-01
Chapter 3 Card Protection
ONS 15310-MA SDH Card and Port Protection
A protection group is automatically formed, with the E1_21_E3_DS3_3 card operating as the working
card, and the E1_63_E3_DS3_3 card operating as the protection card.
Automatic protection groups cannot be created or deleted by users. A protection group is automatically
deleted when the protect card is deleted.
3.2.2 .LMSP Optical Port Protection
With two 15310E-CTX-K9 cards installed, four optical ports are available (two on each card). A Linear
Multiplex Section Protection group can be created between any two pairs of optical ports with matched
port rates.
A protection group can be created using two ports on the same 15310E-CTX-K9 card or between ports
on adjacent 15310E-CTX-K9 cards. You can also create a 1+1 protection group on each card for a total
of two protection groups. In this case, working and protection ports are provisioned on Slot 3 and
working and protection ports are provisioned on Slot 4 (the same card can have both working and protect
ports on it).
3.2.3 .15310E-CTX-K9 Card Equipment Protection
The ONS 15310MA supports a single and dual 15310E-CTX-K9 card configurations. In the dual
configuration, with a 15310E-CTX-K9 card inserted in Slot 3 and Slot 4, the 15310E-CTX-K9 card is
also protected. One of the cards becomes the active card and the other becomes the standby card. Soft
resets executed in the dual 15310E-CTX-K9 card configuration as well as in the single 15310E-CTX-K9
card configuration are errorless. Software upgrades in the single and dual configurations are also
errorless.
In the dual configuration, there is a switchover from the active 15310E-CTX-K9 card to standby
15310E-CTX-K9 card during the soft reset of the active 15310E-CTX-K9 card. After the soft reset or
software upgrade, the old standby 15310E-CTX-K9 card becomes the new active 15310E-CTX-K9 card.
The old active 15310E-CTX-K9 card becomes the standby 15310E-CTX-K9 card.
The 15310E-CTX-K9 card is equipment protected in a dual 15310E-CTX-K9 card configuration. Any
reset occurring on the active 15310E-CTX-K9 card that is triggered due to failure causes a switchover
of the 15310E-CTX-K9 card, causing the old standby card to become the active card.
Note The ONS 15310-MA SDH and the 15310E-CTX-K9 card do not support SNCP switching for VC3
circuits containing BIP errors. The SF/SD alarm is not raised for VC3 circuits.
If there are any path protection or 1+1 protected ports configured across the two 15310E-CTX-K9 cards,
a protection switch will cause the port on the active 15310E-CTX-K9 card to become the active port for
1+1 or the path protection selector.
Note • Any unprotected port on the 15310E-CTX-K9 card being reset may undergo a traffic loss when the
15310E-CTX-K9 is reinitialized.
• If protection exists between two optical ports on the same 15310E-CTX-K9 card and if that
15310E-CTX-K9 card is reset, the traffic might be affected when the 15310E-CTX-K9 card is
reinitialized.