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Chapter 7
Card Protection
•
The following rules apply to portless 1:N protection groups in the ONS 15454:
•
•
•
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.
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:
•
•
•
•
•
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
Total physical connectors
Maximum LD DS-1 Interfaces (transmit [Tx]
and receive [Rx])
Maximum LD DS-3 interfaces (Tx and Rx)
78-18106-01
Working cards can sit on either or both sides of the protect card.
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.
DS1-14, DS1N-14
DS3-12/DS3-12E, DS3N-12/DS3N-12E
DS3XM-6
DS3XM-12
EC1-12
Standard
BNC
48
—
24
7.2 Electrical Card Protection and the Backplane
Table 7-3
High-Density
BNC
MiniBNC
96
192
—
—
48
72
Cisco ONS 15454 Reference Manual, R8.5
shows the number of connectors
UBIC-V and
SMB
AMP Champ
UBIC-H (SCSI)
168
6
16
84
84
84
72
—
72
7-5
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