Cisco ONS 15454 - N Protection

7-3
Cisco ONS 15454 Reference Manual, R7.0.1
OL-9217-01
Chapter 7 Card Protection
7.1 7.1.2 1:N Protection
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.
Figure 7-2 Example: ONS 15454 Cards in a 1:N Protection Configuration (SMB EIA)
Table 7-2 provides the supported 1:N configurations by electrical card, as well as the card types that can
be used for working and protection cards. Additional engineering rules for 1:N card deployments will
be covered in the following sections.
TCC+
XC10G
AIC (Optional)
XC10G
TCC+
Working
Working
Working
Working
Working
Working
Working
Working
Working
Working
1:N Protection
1:N Protection
1:N Protection
32106
Table 7-2 Supported 1:N Protection by Electrical Card
Working Card Protect Card
Protect Group
(Maximum) Working Slot Protection Slot
DS1-14 or DS1N-14 DS1N-14 N <
5 1, 2, 4, 5, 6 3
12, 13, 14, 16, 17 15
DS1/E1-56 DS1/E1-56 N <
21
1
, 2
2
3
16
3
, 17
4
15
DS3-12/DS3-12E or
DS3N-12/DS3N-12E
DS3N-12/DS3N-12E N <
5 1, 2, 4, 5, 6 3
12, 13, 14, 16, 17 15
DS3i-N-12 DS3i-N-12 N <
5 1, 2, 4, 5, 6 3
12, 13, 14, 16, 17 15