7-2
Cisco ONS 15600 SDH Reference Manual, Release 9.0
78-18400-01
Chapter 7 Circuits and Tunnels
7.1 Overview
7.1 Overview
You can create circuits across and within ONS 15600 SDH 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 SDH
subnetwork connection protection (SNCP) ring with third-party equipment SNCPs.
•
Set SNCP circuits as revertive or nonrevertive.
You can provision circuits at any of the following points:
•
Before cards are installed. The ONS 15600 SDH 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]).
•
After cards and SFPs are installed and ports are enabled. Circuits do not actually carry traffic until
the cards and SFPs are installed and the ports are in the Unlocked-enabled state; the
Locked-enabled,maintenance state; or the Unlocked-disabled,automaticInService state. Circuits
carry traffic as soon as the signal is received.
7.2 Circuit Properties
The ONS 15600 SDH Circuits window (
), 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 SDH, the circuit type is HOP (high-order circuit).
•
Size—The circuit size can be VC3, VC4, VC4-4c, VC4-8c, VC4-16c, or VC4-64c. ASAP optical
ports also allow circuit sizes of VC4-2c and VC4-3c. For time slot availability on concatenated VCs,
see the
“7.2.1 Concatenated VC4 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
.
•
Direction—The circuit direction, either two-way or one-way.
•
Status—The circuit status; for details, see the
“7.2.2 Circuit Status” section on page 7-6
.
•
Source—The circuit source in the format:
node/slot/port/virtual container
. If an ASAP PPM port is
the circuit source, the port format is
PIM-PPM-port
, where pluggable interface module (PIM) and
PPM values are 1 through 4 (for example, p1-1-1). PPMs have only one port.
•
Destination—The circuit destination in the format:
node/slot/port/virtual container
. If an ASAP
PPM port is the circuit destination, the port format is
PIM-PPM-port
, where PIM and PPM values
are 1 through 4 (for example, p1-1-1). PPMs have only one port.
