Relation between ATM and Sonet

Answered Question
Mar 28th, 2009

Hi everybody!

My understanding is ATM is data link packet switched Wan solution like FRame relay .

Sonet means ( fiber optics) links over which ATM frames(cells) travel. So In this sense, sonet should be mapped to physical layer of OSI layers.

Is my understanding correct ?

Thanks a lot and have a nice weekend !

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Correct Answer by Giuseppe Larosa about 7 years 10 months ago

Hello Sarah,

from the OSI point of view SONET provides L1 services to data networks.

The Sonet framework and its associated protocols and features like path protection, reroute can also be classified up to OSI layer3.

In communication world Sonet/SDH is seen as a transport framework (not OSI transport layer)that provides a structured synchronus service to transport TDM circuits from E1/T1 to OC-1 and above.

Hope to help

Giuseppe

Correct Answer by Edison Ortiz about 7 years 10 months ago

Sarah,

transport.

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Edison.

Correct Answer by Edison Ortiz about 7 years 10 months ago

So In this sense, sonet should be mapped to physical layer of OSI layers.

Actually, SONET is considered a transport protocol. Check this link so you can see how a SONET frame looks like:

http://www.cisco.com/en/US/tech/tk482/tk607/technologies_tech_note09186a0080124afa.shtml

HTH,

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Edison.

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Overall Rating: 5 (4 ratings)
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sarahr202 Sat, 03/28/2009 - 19:40

Thanks A lot Edison !

What layer of osi,does sonet operate?

My guess is data link layer.

Correct Answer
Giuseppe Larosa Sun, 03/29/2009 - 05:16

Hello Sarah,

from the OSI point of view SONET provides L1 services to data networks.

The Sonet framework and its associated protocols and features like path protection, reroute can also be classified up to OSI layer3.

In communication world Sonet/SDH is seen as a transport framework (not OSI transport layer)that provides a structured synchronus service to transport TDM circuits from E1/T1 to OC-1 and above.

Hope to help

Giuseppe

Edison Ortiz Sun, 03/29/2009 - 08:50

Great post Giuseppe, rated accordingly :)

And btw, I stand corrected

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Edison.

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