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CHAPTER
7-1
Cisco ONS 15600 Reference Manual, R7.2
7
Circuits and Tunnels
Note
The terms "Unidirectional Path Switched Ring" and "UPSR" may appear in Cisco literature. These terms
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 15600 synchronous transport signal (STS) circuits and data
communications channel (DCC) and IP-encapsulated tunnels. To provision circuits and tunnels, refer to
the Cisco ONS 15600 Procedure Guide.
Chapter topics include:
•
7.1 Overview, page 7-2
•
7.2 Circuit Properties, page 7-2
•
7.3 Cross-Connect Card Bandwidth, page 7-12
•
7.4 DCC Tunnels, page 7-12
•
7.5 Multiple Destinations for Unidirectional Circuits, page 7-13
•
7.6 Path Protection Circuits, page 7-13
•
7.7 Protection Channel Access Circuits, page 7-15
•
7.8 BLSR STS and VT Squelch Tables, page 7-16
•
7.9 Path Trace, page 7-17
•
7.10 Automatic Circuit Routing, page 7-18
•
7.11 Manual Circuit Routing, page 7-20
•
7.12 Constraint-Based Circuit Routing, page 7-21
•
7.13 Bridge and Roll, page 7-22
•
7.14 Merged Circuits, page 7-26
•
7.15 Reconfigured Circuits, page 7-27
•
7.16 Server Trails, page 7-27