3-5
Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 3 Card Reference
Electrical Card Protection
3.2.1 1:0 Protection
The term 1:0 protection is sometimes used for an unprotected configuration.
3.2.2 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. When the failure on the working card is
resolved, traffic automatically reverts to the working card. Figure 3-1 shows the ONS 15454 SDH in a
1:1 protection configuration; Slot 1 is protecting Slot 2, Slot 3 is protecting Slot 4, Slot 17 is protecting
Slot 16, and Slot 15 is protecting Slot 14. Each working card is paired with a protect card. Slots 6 and
12 are not used for electrical cards. They have no corresponding FMEC slots.
Figure 3-1 ONS 15454 SDH cards in a 1:1 protection configuration
3.2.3 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.
61245
1:1 Protection
TCC-I
XC10G
XC10G
TCC-I
Working
Working
Working
(not electr.)
Working
(not electr.)
Working
Working
Protect
Protect
Working
Working
Protect
Protect
FMEC
FMEC
FMEC
FMEC
FMEC
MIC-A/P
MIC-T/C/P
FMEC
FMEC
FMEC
FMEC
FMEC
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