Cisco ONS 15454 SDH Specifications download pdf (Page 254)

6-2

Cisco ONS 15454 SDH Installation and Operations Guide, R3.3

May 2002

Chapter 6 Circuits and Tunnels

Creating VC High-Order Path Circuits

Note To create Ethernet circuits, see the “E Series Circuit Configurations” section on page 9-14 or the

“G1000-4 Circuit Configurations” section on page 9-30.

• Automatically or manually route VC high-order path circuits

• Automatically route VC low-order path tunnels

• Automatically create multiple circuits

• 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 15454 SDH

subnetwork connection protection ring (SNCP) with third-party equipment SNCPs

Note In this chapter, “cross-connect” and “circuit” have the following meanings: Cross-connect refers to

the connections that occur within a single ONS 15454 SDH to allow a circuit to enter and exit an

ONS 15454 SDH. Circuit refers to the series of connections from a traffic source (where traffic enters

the ONS 15454 SDH network) to the drop or destination (where traffic exits an ONS 15454 SDH

network).

6.2 Creating VC High-Order Path Circuits

This section explains how to create VC high-order path circuits. The E1 card, STM-N cards, and

Ethernet cards all use high-order path circuits. To create circuits for E3 and DS3i cards, see the “Creating

VC Low-Order Path Tunnels for Port Grouping” section on page 6-10. For an explanation of circuits and

tunnels, see the “Cross-Connect Card Capacities” section on page 6-23.

You can create unidirectional or bidirectional, revertive or non-revertive high-order path circuits. CTC

can route circuits automatically or you can use CTC to manually route circuits.

You can provision circuits at any of the following points:

• Before cards are installed. The ONS 15454 SDH allows you to provision slots and circuits before

installing the traffic cards. (To provision an empty slot, right-click it and select a card from the

shortcut menu.) However, circuits cannot carry traffic until you install the cards and place their ports

in service. For card installation procedures, see the “Install Optical, Electrical, and Ethernet Cards”

procedure on page 1-33. For ring-related procedures, see Chapter 5, “SDH Topologies.”

• After cards are installed, and their ports are out of service. You must place the ports in service before

circuits will carry traffic.

• After cards are installed, and their ports are in service. Circuits will carry traffic as soon as the signal

is received.

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Cisco ONS 15454 SDH Specifications Page 254