
TMSL 097-44018-26
Issue 2: Sep 99
Page 66
COMMAND CODE: OPR-PROTNSW
PURPOSE
OPERATE PROTECTION SWITCH
To determine the protection configuration of the system use the RTRV-ATTR-CONT command to indi-
cate the protection type, i.e., unprotected, 1-for-1, 1+1, or 1-for-N. In addition, use the RTRV-COND-
EQPT command to determine which card of a 1-for-1 pair is the working and which is the protection card.
The working card is indicated by the <condtype> IS-NR-ACT, whereas the protection card is indicated
by the <condtype> IS-NR-STBY.
1-for-1 protection:
This command is only for TO-EA5, EA10, EA10M, EA20, & EA20M timing output cards that are set for
1-for-1 protection. This command forces a protection switch between a normally working timing output
card and a protection timing output card (or visa versa) for maintenance purposes. This command will
be denied if the protection type (SET-ATTR-CONT) is not appropriate for the output card(s) requested,
or if the protection card is out of service. Before a card is pulled out of a shelf, the appropriate RMV com-
mand should be used to avoid alarms.
There is a working card (odd slot) and a protection card (even slot). A card or port failure on the working
card initiates a switch to the protection card. The status of the working card changes from IS-NR-ACT
to IS-NR-STBY or OOS-MT-FLT (depending on the failure) and the status of the protection card changes
from IS-NR-STBY to IS-NR-ACT. When the failed card is replaced, status of the replacement card is IS-
NR-STBY, and the status of the protection card remains IS-NR-ACT. Subsequently, the OPR-PROTNSW
command can be used to switch back to make the original working card the active card.
If there has never been a failure of either card of the pair, or the protection card has failed and was re-
placed:
•
The OPR-PROTNSW command is used to switch from the active working card to the standby
protection card.
•
The RLS-PROTNSW is used to switch from the active protection card to the standby working
card.
If the working card has failed and was replaced:
•
The OPR-PROTNSW command is used to switch from the active protection card to the standby
working card.
•
The RLS-PROTNSW is used to switch from the active working card to the standby protection
card.
Caution:
If the OPR-PROTNSW command is used to switch to the protection card and subsequent-
ly there is a protection card or port failure, there is no automatic switch to the working card (service
is locked to the failed protection card!). To make the working card the active card, the RLS-PROT-
NSW command is used.
1-plus-1 protection:
The OPR-PROTNSW and RLS-PROTNSW commands are not applicable with this protection type.