1152700 • Issue 1 • February 2001 • Section 2 Operations and Maintenance
Page 3 of 3
Table 771-1. Card Protection Schemes
CARD TYPE
NMIC
SC
622 Ring Card
155CRS
T3 CRS
T3 TMUX Multi 1 /
T3 EXP
T1 Multi 1
E1 Multi 1
PROTECTION SCHEME
1:1
1:1
N/A
1+1
1:N (N≤ 3)
1:N (N ≤ 1)
1:N (N≤ 8)
1:N (N≤ 8)
REQUIREMENTS
Cards required at Gateway Node installed in adjacent slots. Working card in slots 2 and 3, protect card in slots 4 and 5. Shelf may operate with a minimum of one card but redundancy is recommended.
Cards required in all Cellworx STN shelves, working in slot 1, protect in slot 18. Shelf may operate with a minimum of one card but redundancy is recommended.
All ring nodes must have cards installed in slots 16 and 17. Optical paths redundant though RICs.
Cards must be installed in any adjacent AIC slots. Dual port cards support two separate interfaces.
Three ports per card will switch to protect with a single port failure. One group of contiguous slots across the backplane up to four total cards per group.
One set of cards can be protected by a second set, or a single T3 TMUX can be protected by a redundant T3 TMUX.
One group of contiguous slots across the backplane up to nine total cards per group.
One group of contiguous slots across the backplane up to nine total cards per group.
Table 771-2. Protection Switch Command Definitions
SELECTION
OPTIONS
DEFINITIONS
Command
Lock out
Forced Switch
Manual Switch
Enable Auto Switch
Prevents card from switching to protect.
Force card to go to protection even if path is not reliable or available.
A manual request to switch to or from protection, depending on card selected, will take effect if no other cards are switched to protect and if path is good.
If card is part of a protection mechanism and a switch is activated, enabling the card will allow the revertive switch to take place after specified time period.
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© 2000, ADC Telecommunications, Inc.
