Specifications

17
Cisco ONS 15454 Product Overview, R3.3
May 2002
Cisco ONS 15454 Product Overview
Cisco Transport Controller
Optical Protection
The ONS 15454 supports 1+1 protection to create redundancy for optical cards
and spans. With 1+1 protection, one optical port can protect another optical port;
therefore, in any two high-speed slots a single working card and a single dedicated
protect card of the same type (for example, two OC-48 cards) can be paired for
protection. If the working port fails, the protect port takes over. 1+1 span
protection can be either revertive or non-revertive.
Because the OC-3 card is a multiport card, port-to-port protection is available.
The ports on the protect card support the corresponding ports on the working card.
Protection Switching
The ONS 15454 supports revertive and non-revertive, unidirectional or
bidirectional switching for optical signals. 1:N electrical protection is always
revertive and bidirectional; 1:1 electrical protection is also bidirectional but
provides the revertive or non-revertive option.
When a failure occurs and automatic protection switching (APS) switches the
signal from the working card to the protect card, non-revertive switching does not
revert the traffic to the working card automatically when the working card reverts
to active status. When a failure is cleared, revertive switching automatically
switches the signal back to the working card after the provisionable revertive time
period has elapsed.
When a failure occurs to a signal that is provisioned as bidirectional, both the
transmit and receive signals are switched away from the point of failure (the port
or card). A unidirectional signal switches only the failure direction, either
transmit or receive.
Cisco Transport Controller
Cisco Transport Controller (CTC) is a software program that is automatically
downloaded from the TCC+ card to your workstation when you connect to the
ONS 15454. CTC gives you control of Operation, Administration, Maintenance,
and Provisioning (OAM&P) activities for the ONS 15454.