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7-5
Cisco ONS 15454 Reference Manual, R8.5.x
78-18106-01
Chapter 7 Card Protection
7.2 Electrical Card Protection and the Backplane
• Working cards can sit on either or both sides of the protect card.
The following rules apply to portless 1:N protection groups in the ONS 15454:
• Working and protect card groups can reside in the same card bank or different card banks (Side A
or Side B).
• The 1:N protect card can be installed in either Slot 3 or Slot 15 and protect working cards in both
card banks.
• Working cards can sit on either or both sides of the protect card.
The ONS 15454 supports 1:N equipment protection for all add-drop multiplexer (ADM) configurations
(ring, linear, and terminal), as specified by Telcordia GR-253-CORE. For detailed procedures for setting
up DS-1 and DS-3 protection groups, refer to the Cisco ONS 15454 Procedure Guide.
7.2 Electrical Card Protection and the Backplane
Protection schemes for electrical cards depend on the EIA type used on the ONS 15454 backplane. The
difference is due to the varying connector size. For example, because BNC connectors are larger, fewer
DS3-12 cards can be supported when using a BNC connector. Table 7-3 shows the number of connectors
per side for each EIA type according to low-density and high-density interfaces.
In the tables, high-density (HD) cards include the DS3/EC1-48 and DS1/E1-56 cards. Low-density (LD
cards) include the following:
• DS1-14, DS1N-14
• DS3-12/DS3-12E, DS3N-12/DS3N-12E
• DS3XM-6
• DS3XM-12
• EC1-12
Note For EIA installation, refer to the “Install the Shelf and Backplane Cable” chapter in the
Cisco ONS 15454 Procedure Guide.
Caution When a protection switch moves traffic from the working/active electrical card to the protect/standby electrical card,
ports on the new active/standby card cannot be taken out of service as long as traffic is switched. Lost traffic can
result when a port is taken out of service even if the standby electrical card no longer carries traffic.
Table 7-3 EIA Connectors Per Side
Interfaces per Side
Standard
BNC
High-Density
BNC MiniBNC SMB AMP Champ
UBIC-V and
UBIC-H (SCSI)
Total physical connectors 48 96 192 168 6 16
Maximum LD DS-1 Interfaces (transmit [Tx]
and receive [Rx])
—— —8484 84
Maximum LD DS-3 interfaces (Tx and Rx) 24 48 72 72 — 72