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Thursday 19 January 2012


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
OC =Optical Carrier
HSSI=High-Speed Serial Interface
SDH =synchronous digital hierarchy
DS =Digital Signal
POTS =Plain old telephone service

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