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7-2
Cisco ONS 15600 Reference Manual, R7.2
Chapter 7 Circuits and Tunnels
7.1 Overview
Note
In this chapter, “cross-connect” and “circuit” have the following meanings: cross-connect refers to the
connections that occur within a single ONS 15600 to allow a circuit to enter and exit an ONS 15600.
Circuit refers to the series of connections from a traffic source (where traffic enters the ONS 15600
network) to the destination (where traffic exits an ONS 15600 network).
7.1 Overview
You can create circuits across and within ONS 15454 nodes and assign different attributes to circuits.
For example, you can:
•
Create one-way, two-way (bidirectional), or broadcast circuits.
•
Assign user-defined names to circuits.
•
Assign different circuit sizes.
•
Automatically or manually route circuits.
•
Automatically create multiple circuits with autoranging.
•
Provide full protection to the circuit path.
•
Provide only protected sources and destinations for circuits.
•
Define a secondary circuit source or destination that allows you to interoperate an ONS 15600 path
protection with third-party equipment path protection configurations.
•
Set path protection circuits as revertive or nonrevertive.
You can provision circuits at either of the following points:
•
Before cards are installed. The ONS 15600 allows you to provision slot and circuits before installing
the traffic cards.
•
After you preprovision the small-form factor pluggables (SFPs) (also called provisionable port
modules [PPMs]).
•
Cards and SFPs are installed and ports are in service. Circuits do not actually carry traffic until the
cards and SFPs are installed and the ports are In-Service and Normal (IS-NR); Out-of-Service and
Autonomous, Automatic In-Service (OO-AU,AINS); or Out-of-Service and
Management, Maintenance (OOS-MA,MT). Circuits will carry traffic as soon as the signal is
received.
7.2 Circuit Properties
The ONS 15600 Circuits window (Figure 7-1 on page 7-3), which is available from network, node, and
card view, is where you can view information about circuits, including:
•
Name—The name of the circuit (user-assigned or automatically generated).
•
Type—For the ONS 15600, the circuit type is STS (STS circuit).
•
Size—The STS circuit size can be 1, 3c, 12c, 24c, 48c, or 192c. The STS circuit size for ASAP PPM
ports also includes 6c and 9c. For time slot availability on concatenated STSs, see the
“7.2.1 Concatenated STS Time Slot Assignments” section on page 7-4.
•
Protection—The protection type; see the “7.2.4 Circuit Protection Types” section on page 7-8.