Specifications

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Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 3 Maintenance
Protection Group Switching
b. Under Protection Groups, choose the 1+1 protection group.
c. Under Selected Group, choose the port with the force on it.
d. From Switch Commands, click Clear.
e. Click Yes on the confirmation dialog box.
The forced switch clears and traffic is running. If you have lost traffic, perform a downgrade. The
procedure for downgrading is the same as upgrading except that you choose a lower-rate card.
Note You cannot downgrade if circuits exist on the STSs that you will remove (the higher STSs).
Step 11 Repeat these steps for the other line in the 1+1.
When the other line in the 1+1 has been upgraded, the span upgrade is complete.
3.13 Protection Group Switching
Protection group switching allows you to prohibit traffic from switching to a specified card using the
Maintenance > Protection tabs. Protection group switching can be accomplished by applying a Lock On
or a Lock Out to a specified card. When the Lock On state is applied to a specified working or protect
card, any traffic which is currently on that card will remain on that card and will be unable to switch to
the opposite card. When the Lock Out state is applied to a specified working or protect card, any traffic
which is currently on that card will be switched to the opposite card. A combination of Lock On and
Lock Out is allowed in 1:1 and 1:N protection; for example, a Lock On on the working card and a Lock
Out on the protect card.
Note A non-alarmed event (INHSW) is raised when a card is placed in a Lock On or Lock Out state.
Procedure: Apply a Lock On
Note To apply a Lock On to a protect card in a 1:1 or 1:N protection group, the protect card must be active.
If the protect card is not active, the Lock On button is disabled. To make the protect card active, you
must switch traffic from the working card to the protect card. When the protect card is active, you
can apply the Lock On.
To inhibit traffic from being switched from one card to another, apply a Lock On. Identify which
protection group you have to determine which card can be placed in a Lock On state:
• For a 1:1 electrical protection group, both the working and protect cards can be placed in the Lock
On state.
• For a 1:N electrical protection group, both the working and protect cards can be placed in the Lock
On state.
• For a 1+1 optical protection group, only the working card can be placed in the Lock On state.
Step 1 In Node view, click the Maintenance > Protection tabs.