Filter
Top Products
7-2
Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
Chapter 7 Card Protection
7.1.2 1:N Protection
Figure 7-1 ONS 15454 SDH Cards in a 1:1 Protection Configuration
7.1.2 1:N Protection
1:N protection allows a single card to protect several working cards. An E1-N-14 card protects up to four
E1-N-14 cards, and a DS3i-N-12 card protects up to four DS3i-N-12 cards.
Currently, 1:N protection operates only at the E-1 and DS-3 levels. The 1:N protect cards must match
the levels of their working cards. For example, an E1-N-14 protects only E1-N-14 cards, and a
DS3i-N-12 protects only DS3i-N-12 cards.
The physical E-1 or DS-3 ports on the ONS 15454 SDH FMEC cards use the working card until the
working card fails. When the node detects this failure, the protect card takes over the physical E-1 or
DS-3 electrical interfaces through the relays and signal bridging on the backplane. Figure 7-2 shows the
ONS 15454 SDH in a 1:N protection configuration. Each side of the shelf assembly has only one card
protecting all of the cards on that side.
83626
1:1 Protection
FMEC
FMEC
FMEC
FMEC
FMEC
MIC-A/P
MIC-T/C/P
FMEC
FMEC
FMEC
FMEC
FMEC
Timing, Comm., and Control
Cross Connect
Cross Connect
Timing, Comm., and Control
Working
Working
Working
(not electric)
Working
(not electric)
Working
Working
Protect
Protect
Working
Working
Protect
Protect
AIC-I (optional)
1 2 3 4 5 6 7 8 91011121314151617
18 19 20 21 22 23 24 25 26 27 28 29