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1152700 • Issue 1 • February 2001 • Section 2 Operations and Maintenance
Page 2-304
© 2000, ADC Telecommunications, Inc.
DLP-771
Page 3 of 3
Table 771-1. Card Protection Schemes
CARD TYPE PROTECTION
SCHEME
REQUIREMENTS
NMIC 1:1 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.
SC 1:1 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.
622 Ring Card N/A All ring nodes must have cards installed in slots 16 and 17.
Optical paths redundant though RICs.
155 CRS 1+1 Cards must be installed in any adjacent AIC slots. Dual port
cards support two separate interfaces.
T3 CRS 1:N (N≤ 3) 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.
T3 TMUX Multi 1 /
T3 EXP
1:N (N ≤ 1) One set of cards can be protected by a second set, or a
single T3 TMUX can be protected by a redundant T3
TMUX.
T1 Multi 1 1:N (N≤ 8) One group of contiguous slots across the backplane up to
nine total cards per group.
E1 Multi 1 1:N (N≤ 8) 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.