Cisco ONS 15454 SDH Specifications Page 127

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3-7
Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 3 Card Reference
Optical Card Protection
The ONS 15454 SDH supports 1:N equipment protection for all add-drop multiplexer configurations
(ring, linear, and terminal), as specified by ITU-T G.841.
The ONS 15454 SDH automatically detects and identifies a 1:N protection card when the card is
installed in Slot 3 or Slot 15. However, the slot containing the 1:N card in a protection group must be
manually provisioned as a protect slot because by default all cards are working cards.
3.2.4 Electrical Card Protection and the FMECs
Note For EIA descriptions and installation, refer to Cisco ONS 15454 SDH Installation and Operations
Guide, R3.3.
Note When a protection switch moves traffic from the DS3i-N-12 working/active card to the DS3i-N-12
protect/standby card, ports on the new active/standby card cannot be taken out of service. Lost traffic
can result when a port is taken out of service even if the DS3i-N-12 active/standby card no longer
carries traffic.
3.3 Optical Card Protection
The ONS 15454 SDH currently supports 1+1 span protection to create redundancy for optical cards.
Optical cards in any two slots can be paired for protection. 1+1 protection pairs a single working card
with a single dedicated protect card. If the working card fails, the protect card takes over.
With non-revertive 1+1 protection, when a failure occurs and the signal switches from the working card
to the protect card, the signal stays switched to the protect card until it is manually switched back.
Revertive 1+1 protection automatically switches the signal back to the working card when the working
card comes back online.
3.4 Multiport Card Protection
For multiport cards such as the E1-N-14, DS3i-N-12, and the OC3 IR 4/STM1 SH 1310, the ports on the
protect card support the corresponding ports on the working card. With 1:1 or 1:N protection (electrical
cards), the protect card must protect an entire slot. In other words, all the ports on the protect card will
be used in the protection scheme.
With 1+1 protection (optical cards), protection can be assigned on a per-port basis. But the working and
protect ports cannot be on the same card. In other words, any number of ports can be assigned as
protection ports. On a four-port card, for example, you could assign one port as a protection port
(protecting the corresponding port on the working card) and leave three ports unprotected. Conversely,
you could assign three ports as protection ports and leave one port unprotected.
You create and modify protection schemes using CTC software. Refer to the Cisco ONS 15454 SDH
Installation and Operations Guide, R3.3.
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