Figure 7-8 Ons 15454 In An Unprotected Configuration; Unprotected Cards - Cisco ONS 15454 Reference Manual

7.4 7.4 Unprotected Cards

The protection takes place on the port level, and any number of ports on the protect card can be assigned
to protect the corresponding ports on the working card. For example, on a four-port card, you can assign
one port as a protection port on the protect card (protecting the corresponding port on the working card)
and leave three ports unprotected. Conversely, you can assign three ports as protection ports and leave
one port unprotected. With 1:1 or 1:N protection (electrical cards), the protect card must protect an entire
slot. In other words, all the ports on the protect card are used in the protection scheme.
7.4 Unprotected Cards
Unprotected cards are not included in a protection scheme; therefore, a card failure or a signal error
results in lost data. Because no bandwidth lies in reserve for protection, unprotected schemes maximize
the available ONS 15454 bandwidth.
All cards are in a working state.
Figure 7-8
7.5 External Switching Commands
The external switching commands on the ONS 15454 are Manual, Force, and Lockout. If you choose a
Manual switch, the command will switch traffic only if the path has an error rate less than the signal
degrade (SD) bit error rate threshold. A Force switch will switch traffic even if the path has SD or signal
fail (SF) conditions; however, a Force switch will not override an SF on a 1+1 protection channel.
A Force switch has a higher priority than a Manual switch. Lockouts, which prevent traffic from
switching to the protect port under any circumstance, can only be applied to protect cards (in 1+1
configurations). Lockouts have the highest priority. In a 1+1 configuration you can also apply a lock on
to the working port. A working port with a lock on applied cannot switch traffic to the protect port in the
protection group (pair). In 1:1 protection groups, working or protect ports can have a lock on.
Cisco ONS 15454 Reference Manual, R7.0.1
7-14
Figure 7-8
ONS 15454 in an Unprotected Configuration
shows the ONS 15454 in an unprotected configuration.
Unprotected
Chapter 7 Card Protection
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