Cisco ONS 15454 Series Procedure Manual page 171

Chapter 6 Create Circuits and VT Tunnels
Table 6-1
Circuit Option
Source
Destination
Automatic
circuit routing
Manual circuit
routing
VT tunnel
VT aggregation
point
ONS 15454 circuits are either VT or STS circuits.
options for VT circuits.
Table 6-2
Card
DS1-14, DS1N-14
DS3XM-6
DS3XM-12
DS3/EC1-48
EC1-12
OC3 IR 4/STM1 SH 1310
OC3 IR/STM1 SH 1310-8
OC12 IR/STM4 SH 1310
OC12 LR/STM4 LH 1310
OC12 LR/STM4 LH 1550
OC12 IR/STM4 SH 1310-4
All OC-48 cards (does not include
the ML-Series card)
August 2005
ONS 15454 Circuit Options
Description
The circuit source is where the circuit enters the ONS 15454 network.
The circuit destination is where the circuit exits an ONS 15454 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 synchronous transport signal (STS)
or virtual tributary (VT) for each circuit segment and create circuits from work orders
prepared by an operations support system (OSS) like the Telcordia Trunk Information
Record Keeping System (TIRKS).
VT tunnels allow VT1.5 circuits to pass through an ONS 15454 without utilizing
cross-connect card (XC, XCVT, XC10G) resources. VT circuits using VT tunnels use
cross-connect capacity only at the source and destination nodes. One VT tunnel can
carry 28 VT1.5 circuits.
VT aggregation points (VAPs) allow VT circuits to be aggregated into an STS for
handoff to non-ONS 15454 networks or equipment, such as interoffice facilities
(IOFs), switches, or digital access cross-connect systems. VAPs reduce VT matrix
resource utilization at the node where the VT1.5s are aggregated onto the STS. This
node is called the STS grooming end. The STS grooming end requires an EC1, DS3,
DS3E, DS3i-N-12, DS3XM-6, DS3XM-12, or OC-N card. VT aggregation points can
be created on BLSR, 1+1, or unprotected nodes, but cannot be created on path
protection nodes.
CTC Circuit Source and Destination Options for VT Circuits
Ports
—
6
12
48
12
4
8
—
4
—
Table 6-2 shows the circuit source and destination
STSs VTs
— —
— —
— —
— —
— 28 per port
3 per port 28 per STS
3 per port 28 per STS
12 28 per STS
12 per port 28 per STS
48 28 per STS
Cisco ONS 15454 Procedure Guide, R5.0
Before You Begin
DS-1s
14
28 per port
28 per port
28 per port
—
—
—
—
—
—
6-3