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Cisco 12000/10700 v3.1.1 Router Manager User Guide
OL-4455-01
APPENDIX
A
SONET/SDH Conversion Chart
The term Synchronous Optical NETwork (SONET) is used instead of Synchronous Digital Hierarchy
(SDH) throughout this Guide. However, these two terms are somewhat interchangeable. The
Cisco 12000/10720 Router Manager application handles both SDH and SONET in the same manner. The
Cisco 12000 Series Routers support both SDH and SONET.
SONET was defined by the American National Standards Institution (ANSI) and is used in North
America.
SDH was defined by the European Telecommunications Standards Institute (ETSI) and is now used
everywhere outside of North America and Japan. SDH was standardized by the International
Telecommunications Union (ITU).
Table A-1 compares SONET and SDH speeds.
Table A-1 SONET and SDH Speeds
SONET SDH
OC-3 STM-1
OC-12 STM-4
OC-48 STM-16
OC-192 STM-64
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