Atm over sonet
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ATM Over SONET. By: Kavitha Sriraman, CEPE, Dept of ECE, Drexel University, Email : [email protected] What is ATM over SONET??. prevalent in the Computer Networking for transmitting of Internet Packets.

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ATM Over SONET

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Atm over sonet

ATM Over SONET

By:

Kavitha Sriraman,

CEPE, Dept of ECE, Drexel University,

Email : [email protected]

ATM over SONET~Kavitha Sriraman


What is atm over sonet

What is ATM over SONET??

  • prevalent in the Computer Networking for transmitting of Internet Packets.

  • optical layer provides the foundation of transport services for both metro and long-haul applications. .

  • Transporting Layer is the ATM.

ATM over SONET~Kavitha Sriraman


Sonet

SONET??

  • Synchronous Optical NETwork.

  • Synchronous, Asynchronous, Plesiochronous.

  • Plesiochronous difference.

  • Data rate

ATM over SONET~Kavitha Sriraman


Sonet signal

SONET SIGNAL.

  • defines a technology for carrying many signals of different capacities through a synchronous, flexible, optical hierarchy ~ Byte interleaving.

  • SONET multiplexing involves the generation of the lowest level or base signal- STS–1

  • operates at 51.84 Mbps.

  • Higher-level signals are integer multiples of STS–1, creating the family of STS–N signals

ATM over SONET~Kavitha Sriraman


Sonet signal table

SONET SIGNAL TABLE.

ATM over SONET~Kavitha Sriraman


Sonet frame format

SONET FRAME FORMAT

  • divided into two main areas: transport overhead and the synchronous payload envelope (SPE).

  • SPE divided into two parts: the STS path overhead (POH) and the payload.

  • Once the payload is multiplexed into the synchronous payload envelope, it can be transported and switched through SONET without being examined and possibly de-multiplexed at intermediate nodes ~service-independent or transparent .

ATM over SONET~Kavitha Sriraman


Transmission of signals in sonet

Transmission Of Signals in SONET

  • signal into containers. Adds the section overhead ~ signal and the quality of transmission are all traceable.

  • containers have two names depending on size: virtual tributary (VT) or a synchronous payload envelope (SPE).

  • path overhead contains data to control the facility (end to end) such as for path trace, error monitoring, far-end error, or virtual container (VC) composition.

  • packaged in VCs and transported in synchronous transport vehicles or signals (STS).

ATM over SONET~Kavitha Sriraman


Transmission of signals in sonet1

Transmission Of Signals in SONET

ATM over SONET~Kavitha Sriraman


Transmission of signals in sonet contd

Transmission Of Signals in SONET contd..

  • An STS exists on each section (i.e., the link between two nodes), also contains the line or section overhead.

  • This line/section overhead contains data to control the node-to-node transmission (protection switching, error monitoring), and, in addition, provides extra channels (network management and maintenance phone link).

  • line transmission rates are 51, 155, and 622 Mbps; 2.5 Gbps; and 10 Gbps.

  • Line signals can be optical or electrical. Electrical signals are used for short distances.

ATM over SONET~Kavitha Sriraman


Transmission of signals in sonet contd1

Transmission Of Signals in SONET contd..

ATM over SONET~Kavitha Sriraman


Asynchronous transfer mode

Asynchronous Transfer Mode

  • A high-performance, cell-oriented switching and multiplexing technology that utilizes fixed-length packets to carry different types of traffic.

  • fixed-length cells consisting of 48 bytes (8 bits per byte) of payload and 5 bytes of cell header ~ensures that time-critical information such as voice or video is not affected by long data frames or packets.

  • header is organized for efficient switching

ATM over SONET~Kavitha Sriraman


Atm connections

ATM Connections

  • virtual path connections (VPCs), which contain virtual channel connections (VCCs).

  • A virtual channel connection (or virtual circuit) is the basic unit, which carries a single stream of cells, in order, from user to user.

  • All cells belonging to a particular virtual path are routed the same way through the ATM network~ faster recovery in case of major failures.

  • Virtual circuits can be statically configured as permanent virtual circuits (PVCs) or dynamically controlled via signaling as switched virtual circuits (SVCs)~a rich set of service capabilities.

  • SVCs are the preferred mode of operation ~ dynamically established ~ minimizing reconfiguration complexity

ATM over SONET~Kavitha Sriraman


Structure to carry data

Structure to Carry Data

  • ATM cells does not have the structure.

  • SONET provides the VT (containers).

  • its filled with cells (ATM ) of 53 bytes.

  • Higher Data Rate ~ the cells are concatenated.

ATM over SONET~Kavitha Sriraman


Conclusion

Conclusion….

  • high performance via hardware switching

  • dynamic bandwidth for bursty traffic

  • class-of-service support for multimedia traffic.

  • scalability in speed and network size

  • provide a range of data, image, video and voice services that take advantage of increasing insensitivity of the network to distance.

ATM over SONET~Kavitha Sriraman


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