Cisco Systems ONS 15600 manual Circuit Protection Types, 2F Blsr, 2F-PCA, Dri

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 7-3lists 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.

Cisco ONS 15600 Reference Manual, R7.2

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