Before You Begin; Table 5-1 Ons 15310-Ma Sdh Circuit Options; C H A P T E R 5 Create Circuits And Vc Low-Order Path Tunnels - Cisco ONS 15310-MA SDH Procedure Manual

Before You Begin

NTP-H51 Create an Automatically Routed VCAT Circuit, page
16.
NTP-H52 Create a Manually Routed VCAT Circuit, page
17.
NTP-H55 Create Overhead Circuits, page
18.
communications channel (DCC) tunnels, IP-encapsulated tunnels, and user data channel (UDC)
circuits.
19. NTP-H140 Create a Server Trail, page
20. NTP-H179 Create an Overlay Ring Circuit, page
Table 5-1
Table 5-1
Circuit Option
Source
Destination
Automatic
circuit routing
Manual circuit
routing
VCAT
VC low-order
path tunnel
VC low-order
path
aggregation
point
Table 5-2
circuits.
Cisco ONS 15310-MA SDH Procedure Guide, Release 9.1 and Release 9.2
5-2
defines ONS 15310-MA SDH circuit creation terms and options.
ONS 15310-MA SDH Circuit Options
Description
The circuit source is where the circuit enters the ONS network.
The circuit destination is where the circuit exits an ONS 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 (VC
high-order path) or VC low-order path 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).
Virtual concatenated (VCAT) circuits transport traffic using noncontiguous time
division multiplexing (TDM) time slots, avoiding the bandwidth fragmentation
problem that exists with contiguous concatenated (CCAT) circuits. The cards that
support VCAT circuits are the CE-100T-8, CE-MR-6, and ML-100T-8 cards. For
more information, refer to the Cisco ONS 15310-MA SDH Reference Manual.
VC low-order path tunnels allow VC-12 circuits to pass through a node without
utilizing cross-connect resources. VC low-order path circuits using VC low-order
path tunnels use cross-connect capacity only at the source and destination nodes. One
VC low-order path tunnel can carry 28 VC-12 circuits.
VC low-order path aggregation points (VAPs) allow VC low-order path circuits to be
aggregated into a VC high-order path for handoff to non-ONS networks or
equipment, such as interoffice facilities (IOFs), switches, or digital access
cross-connect systems (DACS). VAPs reduce VC low-order path matrix resource
utilization at the node where the VC11s are aggregated onto the VC high-order path.
This node is called the VC high-order path grooming end. The VC grooming end
requires an STM-M port. VC low-order path aggregation points can be created on 1+1
or unprotected nodes, but cannot be created on path protection nodes.
shows the circuit source and destination options for ONS 15310-MA SDH VC low-order path
Chapter 5 Create Circuits and VC Low-order Path Tunnels
5-42—Complete as needed.
5-47—Complete as needed.
5-50—Complete as needed to create data
5-51—Complete as needed.
5-52—Complete as needed.
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