26-3
Cisco BPX 8600 Series Installation and Configuration
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
Chapter 26 Configuring SONET Automatic Protection System
Tiered Management Control
Figure 26-1 SONET Section, Line, and Path
Table 26-3 provides a cross-reference between OC-n optical carrier levels and the equivalent STS-n and
SDH-n levels. It also includes the associated line rates.
Manual Operation
SONET Automatic Protection Switching configures a pair of SONET lines for line redundancy so that
the interface hardware automatically switches from a working line to the protection line or vice versa
within a specified period after an active line failure.
However, you may use the switchapsln command to manually control switching. The last user switch
request (switchapsln) per line pair is saved by switch software so that the APS can be configured
correctly in the event of a node rebuild.
Table 26-2 SONET Section, Line, and Path Descriptions
Unit
Description
Section
A section is the fiber optic cable between two active elements such as simple
repeaters. The active element terminating these sections is called Section
Terminating Equipment (STE).
Line
A line is a physical element that contains multiple sections and repeaters and is
terminated by line terminating equipment (LTE) at each end.
Path
A path includes sections and lines and terminates at the customer premises
equipment (CPE).
Section
CPE
CPE
Switch
LTE
Switch
LTE
STE
STE
Section
Line
Path
12196
Section
Table 26-3 Digital Hierarchies
OC-n
Optical Carrier
STS-n Synchronized
Transport Signal
Line Rates (Mbps)
SDH-n
Synchronized
Digital Hierarchy
STM-n
Synchronous
Transport
Module
OC-1
STS-1
51.84
OC-3
STS-3
155.52
SDH-1
STM-1
OC-12
STS-12
622.08
SDH-4
STM-4
OC-48
STS-48
2488.32
SDH-16
STM-12
Содержание BPX 8600 Series
Страница 43: ...P A R T 1 The BPX Switch ...
Страница 44: ......
Страница 151: ...P A R T 2 Installation ...
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Страница 261: ...P A R T 3 Initial Configuration and Network Management ...
Страница 262: ......
Страница 291: ...P A R T 4 Configuring Connections ...
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Страница 481: ...P A R T 5 Troubleshooting and Maintenance ...
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Страница 531: ...P A R T 6 BPX Specifications ...
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Страница 563: ...P A R T 7 Appendices ...
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Страница 624: ...Glossary 24 Cisco BPX 8600 Series Installation and Configuration Release 9 3 0 Part Number 78 10674 01 Rev D0 July 2001 ...
Страница 630: ...Index 6 Cisco BPX 8600 Series Installation and Configuration Release 9 3 0 Part Number 78 10674 01 Rev D0 July 2001 ...