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Circuits and Tunnels
The terms "Unidirectional Path Switched Ring" and "UPSR" may appear in Cisco literature. These terms
Note
do not refer to using Cisco ONS 15xxx products in a unidirectional path switched ring configuration.
Rather, these terms, as well as "Path Protected Mesh Network" and "PPMN," refer generally to Cisco's
path protection feature, which may be used in any topological network configuration. Cisco does not
recommend using its path protection feature in any particular topological network configuration.
This chapter explains Cisco ONS 15454 SDH high-order and low-order circuits; low-order, data
communication channel (DCC), and IP-encapsulated tunnels; and virtual concatenated (VCAT) circuits.
To provision circuits and tunnels, refer to the Cisco ONS 15454 SDH Procedure Guide.
Chapter topics include:
11.1 Overview, page 11-2
•
11.2 Circuit Properties, page 11-3
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11.3 Cross-Connect Card Bandwidth, page 11-12
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11.4 DCC Tunnels, page 11-12
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11.5 Multiple Destinations for Unidirectional Circuits, page 11-14
11.6 Monitor Circuits, page 11-14
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11.7 SNCP Circuits, page 11-15
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11.8 MS-SPRing Protection Channel Access Circuits, page 11-16
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11.9 MS-SPRing VC4 Squelch Table, page 11-17
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11.10 IEEE 802.17 Resilient Packet Ring Circuit Display, page 11-17
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11.11 Section and Path Trace, page 11-18
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11.12 Path Signal Label, C2 Byte, page 11-19
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11.13 Automatic Circuit Routing, page 11-19
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11.14 Manual Circuit Routing, page 11-21
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11.15 Constraint-Based Circuit Routing, page 11-25
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11.16 Virtual Concatenated Circuits, page 11-26
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11.17 Bridge and Roll, page 11-31
11.18 Merged Circuits, page 11-36
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11.19 Reconfigured Circuits, page 11-37
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78-18119-01
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C H A P T E R
Cisco ONS 15454 SDH Reference Manual, R8.5
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