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7-8
Cisco ONS 15600 Reference Manual, R7.2
Chapter 7 Circuits and Tunnels
7.2.4 Circuit Protection Types
•
After circuit creation, you can change a circuit state in the Edit Circuit window or from the
Tools > Circuits > Set Circuit State menu.
Note
After you have created an initial circuit in a CTC session, the subsequent circuit states default to the
circuit state of the initial circuit, regardless of which nodes in the network the circuits traverse or the
node.ckt.state default setting.
During circuit creation, you can apply a service state to the drop ports in a circuit; however, CTC does
not apply a requested state other than IS-NR to drop ports if:
•
The port is a timing source.
•
The port is provisioned for orderwire or tunnel orderwire.
•
The port is provisioned as a DCC or DCC tunnel.
•
The port supports 1+1 or BLSR.
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 Appendix B, “Administrative and Service States.”
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. Table 7-3 lists the protection type indicators that you will see
in this column.
Table 7-3 Circuit Protection Types
Protection Type Description
1+1 The circuit is protected by a 1+1 protection group.
2F BLSR The circuit is protected by a 2-fiber BLSR.
2F-PCA The circuit is routed on a protection channel access (PCA) path on a two-fiber
BLSR. PCA circuits are unprotected.
DRI The circuit is protected by dual-ring interconnection.
N/A A circuit with connections on the same node is not protected.