10-2
Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
Chapter10 Circuits and Tunnels
10.2 Circuit Properties
•Enable port grouping on low-order path tunnels. Three ports form a port group . For example, in one
E3-12 or one DS3i-N-12 card, four port groups are available: Ports 1 to 3 = PG1, Ports 4 to 6 = PG2,
Ports 7 to 9 = PG3, and Ports 10 to 12 = PG4.
Note CTC shows VC3-level port groups, but the XC10G creates only VC4-level port groups. VC4
tunnels must be used to transport VC3 signal rates.
Note Monitor circuits cannot be created on a VC3 circuit in a port group.
•Automatically or manually route VC high-order and low-order path circuits.
•Automatically route VC low-order path tunnels.
•Automatically create multiple circuits with autoranging. VC low-order path tunnels do not use
autoranging.
•Provide full protection to the circuit path.
•Provide only protected sources and destinations for circuits.
•Define a secondary circuit source or destination that allows you to interope rate an ONS 15454 SDH
subnetwork connection protection (SNCP) ring with third-party equipme nt SNCPs.
You can provision circuits at any of the following points:
•Before cards are installed. The ONS 15454 SDH allows you to provision slots and circuits before
installing the traffic cards. (To provision an empty slot, right-click it and select a card from the
shortcut menu.) However, circuits cannot carry traffic until you install the cards and place their ports
in service. For card installation procedures and ring-related procedures, refer to the
Cisco ONS 15454 SDH Procedure Guide.
•After cards are installed, but before their ports are in service (enabled). You must put the ports in
service before circuits can carry traffic.
•After cards are installed and their ports are in service. Circuits carry traffic as soon as the signal is
received.
10.2 Circuit Properties
The ONS 15454 SDH Circuits window, which appears in network, node , and card view, is where you can
view information about circuits. The Circuits window (Figure10-1 on page 10-4) p rovides the following
information:
•Name—The name of the circuit. The circuit name can be manually assigned or automatically
generated.
•Type—Circuit types are HOP (high-order circuit), LOP (low-order circuit), VCT (VC low-order
tunnel), VCA (VC low-order aggregation point), OCHNC (dense wavelength division multiplexing
[DWDM] optical channel network connection; refer to the refer to the Cisco ONS 15454 DWDM
Installation and Operations Guide), HOP_v (high-order virtual concatena ted [VCAT] circuit), and
LOP_v (low-order VCAT circuit).
•Size—The circuit size. Low-order circuits are VC12 and VC3. High-order circuit sizes are VC4,
VC4-2c, VC4-3c, VC4-4c, VC4-8c, VC4-16c, and VC4-64 c. OCHNC sizes are Equipped not
specific, Multi-rate, 2.5 Gbps No FEC (forward error correction), 2.5 Gbps FEC, 10 Gbp s No FEC,
and 10 Gbps FEC. High-order VCAT circuits are VC4 and VC4-4c. OCHNCs are DWDM only, refer