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SDH Concepts
Features and advantages of SDH
• SDH is apparently synchronous. All the SDH recommendations are based upon the use of a SINGLE reference clock.
• SDH is compatible with existing PDH networks. • SDH provides much simpler extraction and insertion of
any lower- order Tributary stream from a higher-order Tributary stream or frame structure without the need to completely demultiplex
• SDH allows for integrated network management and performance monitoring using centralised network control.
PLESIOCHRONOUS MULTIPLEXING
STM-1 FRAME FORMAT
STM-1 SECTION OVERHEADS
ADD-DROP MULTIPLEXERS
Network Structures
SDH Hierarchy (1)
SDH Hierarchy (2)
STM-256
STM-64
STM-16
STM-4
STM-1
AUG-256
AUG-64
AUG-16
AUG-4
AUG-1
AU-4-64c
AU-4-16c
AU-4-4c
AU-4
AU-3
AU-4-64c
AU-4-16c
AU-4-4c
AU-4
AU-3
C-4-64c
C-4-16c
C-4-4c
x 1
x 1
x 1
x 1
x 1 x 1
x 1
x 1
x 1
x 4
x 4
x 4
x 4
x 3
Pointer Processing
Multiplexing
Aligning
Mapping
Cross connect Structure
Alarms and maintenance
Protection Mechanisms
• Network Protections:– MS-SPRING (2/4 fibre);– MSP (1+1 and 1:N);– 1+1 SNCP;– Gigabit Ethernet 1:1 Line Protection.
• Equipment Protections:– Power Supply Protection;– 1+1 Controller/Communication Card Protection;– 1+1 Switch Card Protection;– Fan Protection;– 1:N Tributary Card Protection on STM-1 G.703
tributary interfaces.
THANK YOU
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