Cisco ONS 15454 SDH Specifications download pdf (Page 256)

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

May 2002

Chapter 6 Circuits and Tunnels

Creating VC High-Order Path Circuits

• Type—Select VC_HO_Path_Circuit (HOP). The circuit type determines the circuit-provisioning

options that are displayed. The E3 and DS3i cards must use VC low-order path tunnels. See the

“Creating VC Low-Order Path Tunnels for Port Grouping” section on page 6-10 for more

information.

• Size—Select the circuit size (VC_HO_Path_Circuits only). VC high-order path circuits can be VC4,

VC4-2c, VC4-3c, VC4-4c, VC4-8c, VC4-16c, and VC4-64c for optical cards and some Ethernet

cards depending on the card type. Of the Ethernet cards, only the G-1000 can use VC4-3c and

VC4-8c. The “c” indicates concatenated VC4s.

• Bidirectional—Check this box to create a two-way circuit; uncheck it to create a one-way circuit.

• Number of circuits—Type the number of circuits you want to create. If you enter more than one, you

can use auto-ranging to create the additional circuits automatically. Otherwise, CTC returns to the

Circuit Source page after you create each circuit until you finish creating the number of circuits

specified here.

• Auto Ranged—Check this box to use the auto-range feature. If you select the source and destination

of one circuit, CTC automatically determines the source and destination for the remaining Number

of circuits and creates the circuits. To determine the source and destination, CTC increments the

most specific part of the end points. An end point can be a port or a VC4. If CTC cannot find a valid

destination, or selects an end point that is already in use, CTC stops and allows you to either select

a valid end point or cancel. If you select a valid end point and continue, auto-ranging begins after

you click Finish for the current circuit.

• Protected Drops—If this box is checked, CTC displays only protected cards and ports (1:1, 1:N, 1+1

or MS-SPRing protection) as choices for the circuit source and destination.

Step 4 (SNCP protection only) Set the SNCP path selector defaults:

• Revertive—Check this box if you want traffic to revert to the working path when the conditions that

diverted it to the protect path are repaired. If Revertive is not chosen, traffic remains on the protect

path after the switch.

• Reversion time—If Revertive is checked, set the reversion time. This is the amount of time that will

elapse before the traffic reverts to the working path. Traffic can revert when conditions causing the

switch are cleared (the default reversion time is 5 minutes).

• SF threshold—Choose from one E-3, one E-4, or one E-5.

• SD threshold—Choose from one E-5, one E-6, one E-7, one E-8, or one E-9.

• Switch on PDI-P—Check this box if you want traffic to switch when a VC4 payload defect indicator

is received (VC4 circuits only).

Step 5 Click Next.

Step 6 In the Circuit Source dialog box, set the circuit source.

Options include node, slot, port, and VC4. The options that display depend on the circuit type and circuit

properties you selected in Step 3 and the cards installed in the node.

Note E1 cards use VC4 circuits. All 12 of the E1 ports use VC4 bandwidth.

Note For information about Ethergroups, see the “E Series Circuit Configurations” section on

page 9-14 and the “G1000-4 Circuit Configurations” section on page 9-30.

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