N Protection - Cisco ONS 15454 Reference Manual

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