Q.
What is the difference between ATM and STM ?
Asked by mohandas pai,
01 Aug '09 10:27 pm
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Answers (3)
1.
You may have your terms mixed up. STM is the synchronous transmission module for SDH (synchronous digital hierarchy). SDH is a generic layer 1 protocol similar to the north american SONET. SDH is an advance on time division multiplexing (interleaving 64k channels) - the STM frames are T1 or higher multiplexes. STM-1 is a standard speed of 155Mb/s.
On the other hand ATM is asynchronous transfer (transport) mode - a layer 2 datalink protocol for WANs. Telcos use ATM to multiplex ADSL channels into (typically) DS-3 hand-offs to internet providers, but ATM isn't primarily a multiplexing protocol.
from web.
Answered by anantharaman, 01 Aug '09 10:33 pm
On the other hand ATM is asynchronous transfer (transport) mode - a layer 2 datalink protocol for WANs. Telcos use ATM to multiplex ADSL channels into (typically) DS-3 hand-offs to internet providers, but ATM isn't primarily a multiplexing protocol.
from web.
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2.
STM cud be synchronous transmission module or Scanning tunneling microscopy ...which one u want.
ATM everybody knows!
Answered by harshal kalangutkar, 01 Aug '09 10:35 pm
ATM everybody knows!
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