7-2
Cisco ONS 15454 Reference Manual, R7.0
78-17191-01
Chapter 7 Card Protection
7.1 7.1.1 1:1 Protection
7.1.1 1:1 Protection
In 1:1 protection, a working card is paired with a protect card of the same type. If the working card fails,
the traffic from the working card switches to the protect card. You can provision 1:1 to be revertive or
nonrevertive. If revertive, traffic automatically reverts to the working card after the failure on the
working card is resolved.
Each working card in an even-numbered slot is paired with a protect card in an odd-numbered slot: Slot
1 protects Slot 2; Slot 3 protects Slot 4; Slot 5 protects Slot 6; Slot 17 protects Slot 16; Slot 15 protects
Slot 14; and Slot 13 protects Slot 12.
Figure 7-1 shows an example of the ONS 15454 in a 1:1 protection configuration.
Figure 7-1 Example: ONS 15454 Cards in a 1:1 Protection Configuration (SMB EIA)
7.1.2 1:N Protection
1:N protection allows a single electrical card to protect up to five working cards of the same speed. 1:N
cards have added circuitry to act as the protect card in a 1:N protection group. Otherwise, the card is
identical to the standard card and can serve as a normal working card.
The physical DS-1 or DS-3 interfaces on the ONS 15454 backplane use the working card until the
working card fails. When the node detects this failure, the protect card takes over the physical DS-1 or
DS-3 electrical interfaces through the relays and signal bridging on the backplane. Figure 7-2 shows the
ONS 15454 in a 1:N protection configuration. Each side of the shelf assembly has only one card
protecting all of the cards on that side.
33384
1:1 Protection
TCC+
XC10G
AIC (Optional)
XC10G
TCC+
Working
Working
Working
Working
Working
Working
Protect
Protect
Protect
Protect
Protect
Protect