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Chapter 6
Create Circuits and Low-Order Tunnels
Table 6-1
Circuit Option
Source
Destination
Automatic
circuit routing
Manual circuit
routing
Low-order
tunnel
Low-order
aggregation
point
ONS 15454 SDH circuits are either low-order or high-order circuits.
and destination options for low-order VC3 circuits.
Table 6-2
Card
E3-12
DS3i-N-12
STM1E-12
OC3 IR 4/STM1
OC3 IR 4/STM1-8
OC12 IR/STM4 SH 1310
OC12 LR/STM4 LH 1310
OC12 LR/STM4 LH 1550
OC12 IR/STM4 SH 1310-4
All OC-48/STM16 cards (includes
ML-Series card)
OC-192/STM64
MRC-12
FC_MR-4
1. The number of VC4s depends on the Small Form-factor Pluggable (SFP) used as well as available backplane width and
existing provisioned lines. For additional details, refer to the "Optical Cards" chapter in the Cisco ONS 15454 SDH Reference
Manual.
78-17194-01
ONS 15454 SDH Circuit Options
Description
The circuit source is where the circuit enters the ONS 15454 SDH network.
The circuit destination is where the circuit exits an ONS 15454 SDH network.
Cisco Transport Controller (CTC) routes the circuit automatically on the shortest
available path based on routing parameters and bandwidth availability.
Manual routing allows you to choose a specific path, not just the shortest path chosen
by automatic routing. You can choose a specific VC4, VC3, VC11, or VC12 for each
circuit segment and create circuits from work orders prepared by an Operations
Support System (OSS).
Low-order tunnels allow VC3, VC11, and VC12 circuits to pass through an ONS
15454 SDH without using low-order cross-connect resources on the cross-connect
cards. Low-order circuits using tunnels use low-order cross-connect capacity only at
the source and destination nodes. One low-order tunnel can carry three VC3s, and
each VC3 can contain a VC3 circuit span or 21 VC11 or VC12 circuit spans.
Low-order aggregation points (LAPs) allow low-order VC11, VC12, and VC3
circuits to be aggregated into a VC4 for handoff to non-ONS 15454 SDH networks
or equipment, such as interoffice facilities (IOFs), switches, or digital access
cross-connect systems (DACS). The VC4 grooming end of the LAP requires an
STM-N card. LAPs can be created on MS-SPRings, 1+1, or unprotected nodes, but
cannot be created on SNCP nodes.
CTC Circuit Source and Destination Options for Low-Order VC3 Circuits
Ports
12
12
12
4
8
1
4
1
1
12
4
Table 6-2
shows the circuit source
VC4s
VC3s
1 per port
3 per VC4
1 per port
3 per VC4
1 per port
3 per VC4
1 per port
3 per VC4
1 per port
3 per VC4
4 per port
3 per VC4
4 per port
3 per VC4
16 per port
3 per VC4
64 per port
3 per VC4
1
1, 4, or 16
per port
3 per VC4
—
—
Cisco ONS 15454 SDH Procedure Guide, R7.0
Before You Begin
6-3
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