Circuit Protection Types - Cisco ONS 15600 Reference Manual

7.2.4 Circuit Protection Types

Circuits do not use the soak timer, but ports do. The soak period is the amount of time that the port
remains in the OOS-AU,AINS service state after a signal is continuously received. When the
cross-connects in a circuit are in the OOS-AU,AINS service state, the ONS 15600 monitors the
cross-connects for an error-free signal. It changes the state of the circuit from OOS to IS or to
OOS-PARTIAL as each cross-connect assigned to the circuit path is completed. This allows you to
provision a circuit using TL1, verify its path continuity, and prepare the port to go into service when it
receives an error-free signal for the time specified in the port soak timer. For example, when assigning
the IS,AINS administrative state to cross-connects in STS circuits, the circuit source and destination
ports transition to the OOS-AU,AINS service state. When an alarm-free signal is received, the source
and destination ports remain OOS-AU,AINS for the duration of the soak timer. After the port soak timer
expires, STS source and destination ports change to IS-NR and the circuit service state to IS.
To find the remaining port soak time, choose the Maintenance > AINS Soak tabs in card view and click
the Retrieve button. If the port is in the OOS-AU,AINS state and has a good signal, the Time Until IS
column shows the soak count down status. If the port is OOS-AU,AINS and has a bad signal, the
Time Until IS column indicates that the signal is bad. You must click the Retrieve button to obtain the
latest time value.
For more information about cross-connect states, see
7.2.4 Circuit Protection Types
The Protection column in the Circuit window shows the card (line) and SONET topology (path)
protection used for the entire circuit path.
in this column.
Table 7-3
Protection Type
1+1
2F BLSR
2F-PCA
DRI
N/A
Protected
Unknown
Unprot (black)
Unprot (red)
Path Protection
Cisco ONS 15600 Reference Manual, R8.0
7-8
Table 7-3
Circuit Protection Types
Description
The circuit is protected by a 1+1 protection group.
The circuit is protected by a 2-fiber BLSR.
The circuit is routed on a protection channel access (PCA) path on a two-fiber
BLSR. PCA circuits are unprotected.
The circuit is protected by dual-ring interconnection.
A circuit with connections on the same node is not protected.
The circuit is protected by diverse SONET topologies, for example a BLSR and a
path protection, or a path protection and 1+1.
A circuit has a source and destination on different nodes and communication is
down between the nodes. This protection type appears if not all circuit components
are known.
A circuit with a source and destination on different nodes is not protected.
A circuit created as a fully protected circuit is no longer protected due to a system
change, such as removal of a BLSR or 1+1 protection group.
The circuit is protected by a path protection.
Chapter 7 Circuits and Tunnels
Appendix B, "Administrative and Service States."
lists the protection type indicators that you will see