Available Telecom / Network Speed
Port Type
|
Speed
|
Other info
|
POTS
|
28.8 Kbps
|
|
ISDN BRI
|
64 Kbps
|
|
DS0
|
64 Kbps
|
|
DS1/T1
|
1.544 Mbps
|
sometimes referred as 1.5Mbps
|
E1
|
2.048 Mbps
|
sometimes referred as 2Mbps
|
E3
|
34.368 Mbps
|
sometimes referred as 34Mbps
|
DS3/T3/HSSI
|
44.736 Mbps
|
sometimes referred as 45Mbps
|
OC1/ SONET 1/SDH 1
|
51.84 Mbps
|
sometimes referred as 52Mbps
|
OC3/STM1
|
155.52 Mbps
|
sometimes referred as 155Mbps
|
STM4/OC12
|
622.08 Mbps
|
sometimes referred as 622Mbps
|
Optical transmission systems are known as SONET (Synchronous
Optical NETwork) in North America and SDH (Synchronous Digital Hierarchy) in
the Rest of the World. Optical Carriers are typically known by their OC-x
number where x is a multiple of the OC-1 rate of 51.84 Mbps. While OC-x is a
common world-wide standard for optical systems there are differences but they
are accommodated within the standard. North America uses an STS-x (Synchronous
Transport Signal) format for frames (packets) and Europe an STM-x (Synchronous
Transport Module) format.
Full Form
STM =Synchronous Transport Modules
SONET =Synchronous Optical Network
SDH =synchronous digital hierarchy
DS =Digital Signal
POTS =Plain old telephone service
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