6-3
Cisco ONS 15454 SDH Procedure Guide, R7.0
78-17194-01
Chapter 6 Create Circuits and Low-Order Tunnels
Before You Begin
ONS 15454 SDH circuits are either low-order or high-order circuits.
shows the circuit source
and destination options for low-order VC3 circuits.
Table 6-1
ONS 15454 SDH Circuit Options
Circuit Option
Description
Source
The circuit source is where the circuit enters the ONS 15454 SDH network.
Destination
The circuit destination is where the circuit exits an ONS 15454 SDH network.
Automatic
circuit routing
Cisco Transport Controller (CTC) routes the circuit automatically on the shortest
available path based on routing parameters and bandwidth availability.
Manual circuit
routing
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
tunnel
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
point
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.
Table 6-2
CTC Circuit Source and Destination Options for Low-Order VC3 Circuits
Card
Ports
VC4s
VC3s
E3-12
12
1 per port
3 per VC4
DS3i-N-12
12
1 per port
3 per VC4
STM1E-12
12
1 per port
3 per VC4
OC3 IR 4/STM1
4
1 per port
3 per VC4
OC3 IR 4/STM1-8
8
1 per port
3 per VC4
OC12 IR/STM4 SH 1310
OC12 LR/STM4 LH 1310
OC12 LR/STM4 LH 1550
1
4 per port
3 per VC4
OC12 IR/STM4 SH 1310-4
4
4 per port
3 per VC4
All OC-48/STM16 cards (includes
ML-Series card)
1
16 per port
3 per VC4
OC-192/STM64
1
64 per port
3 per VC4
MRC-12
12
1, 4, or 16
1
per port
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
.
3 per VC4
FC_MR-4
4
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Summary of Contents for ONS 15454 SDH
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