I am trying to understand the reason why the protect card/port shouldn't be in OOS(Out of service) to avoid any traffic loss even though the protect card is not switching traffic in ONS 15454 as stated below
"When a protection switch moves traffic from the DS3-12 working/active card to the DS3-12 protect/standby card, ports
on the new active/standby card cannot be taken out of service as long as traffic is switched. Lost traffic can result
when a port is taken out of service even if the DS3-12 standby card no longer carries traffic."
Anantha Subramanian Natarajan