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Manjit Hota (EC200118144) [1]
Synchronous Optical Network(SONET)
Technical Seminar PresentationBy
Manjit Hota Roll # EC200118144
Under the guidance of
Mr. Nalla Srinivasu
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Manjit Hota (EC200118144) [2]
Standard for optical communication transport
Formulated by ECSA for ANSI
1984
Defines
OCs
STSs
SONET
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Manjit Hota (EC200118144) [3]
Synchronization of Digital Signals
Signal
Synchronous
Asynchronous
Plesiochronous
Digital transitions in the signals occur at exactly same rate
All clocks are traceable to one PRC.
Transition of the signal does not occur at same normal rate
Almost same rate & variation constrained within tight limits
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Manjit Hota (EC200118144) [4]
Signal Bit Rate (Mbps)
STS–1, OC–1 51.840
STS–3, OC–3 155.520
STS–12, OC–12 622.080
STS–48, OC–48 2,488.320
STS–192, OC-192 9,953.280
SONET Synchronous Hierarchy
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Manjit Hota (EC200118144) [5]
Network Design Considerations for SONETNetwork Design Considerations for SONET
TransmissionMedia
Optical fiber. Classified by bandwidth starting at OC-1for 51.84 Mbps.
Bandwidth Ranges from 51.84 Mbps(OC-1) to 9.95 Gbps (OC-192).
ApplicationSupport
Voice, data, video and audio over the same line.
DistanceLimitations
Fees increase as distance increases.
NetworkFunction
Typically the telephone company's backbone. Use forWAN solutions over leased lines for large corporations.
Cost Very expensive. Monthly fees for OC-3 coast-to-coast >$400,000.
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Manjit Hota (EC200118144) [6]
SONET System
Add/Drop
Multiplexer
Regenerator Regenerator
STS MUX STS MUX
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Manjit Hota (EC200118144) [7]
SONET Protocol Stack
Data Link
Physical
Path Layer
Line Layer
Section Layer
Photonic Layer
Four Layers
Photonic Layer
Section Layer
Line Layer
Path Layer
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Manjit Hota (EC200118144) [8]
SONET Frame90 Columns
9 rows
3 columns
TOH SPE
87 columns90 octets/row * 8 bits/octet =720 bits/row
720 bit/roe * 920 rows/frame = 6480 bits/frame
6480 bits/frame * 8000 frames/second = 51.84 Mbps
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Manjit Hota (EC200118144) [9]
OverheadsSimpler Multiplexing
Greatly expanded Operation, Maintenance, Administration & Provisioning
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Manjit Hota (EC200118144) [10]
SONET Multiplexing
Multiplexing principles
Mapping
Aligning
Multiplexing
Stuffing
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Manjit Hota (EC200118144) [11]
SONET Network Configurations
PTE REG PTE
PTE PTEREG REGADM
Point to Point
Point to Multipoint
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Manjit Hota (EC200118144) [12]
ADM
ADM
ADM
ADM
Hub Network Ring Architecture
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Manjit Hota (EC200118144) [13]
SONET & SDH
Developed by CCITT
Standard useful for interfacing between the CCITT & ANSI transmission hierarchies
Developed in 1989
World wide standard & SONET can be considered as a subset of SDH
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Manjit Hota (EC200118144) [14]
Advantages of SONET
Reduced Back-to-Back Multiplexing
Optical Interconnect
Multipoint Configurations
Reduced Cabling
Enhanced OAM&P
Enhanced Performance Monitoring
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Manjit Hota (EC200118144) [15]
Can be used as a backbone or totally replace other networking protocols such as SMDS or FDDI
Can support bandwidth on demand
Can be the carrier for ATM cells
Can be the carrier for ISDN and BISDN
Can replace existing T-1 or T-3 lines
SONET
Applications of SONET
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Manjit Hota (EC200118144) [16]
Conclusion
SONET was developed to promulgate standard optical transmission signal interfaces to allow mid-section needs of fiber optic system
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