SONET vs SDH
Following are the useful links related to SONER and SDH technologies:
• DWDM system basics
• Fibre optic communication
• Types of WDM
• PDH versus SDH
• SONET versus SDH
• What is PDMA?
• What is WDM?
SONET vs SDH provide similarities and difference between SONET and SDH technologies,data rates,number of voice channels supported for various designations(OC,STM).
Both SONET and SDH is information transmission techniques over fibre optic cable.
The both does following functions.
• Frame the information to be transmitted over fibre using HDLC standard
frame format.
• Provides error checking functionalities.
• Take care of link management functionalities.
SONET was developed in US through ANSI T1X1.5 committee,while SDH was developed by ITU.
SONET stands for Synchronous Optical Network while SDH stands for Synchronous Digital Hierarchy. SONET is basically a subset of SDH.
The basic unit of SDH is synchronous transmission module level-1(STM-1). The basic unit of SONET is Optical Carrier level-1(OC-1). The other rates OC-3,OC-12,OC-18,OC-24,OC-36,OC-48,OC-96 and OC-192 are derived from this basic rate.
North American Digital Telephone System
Following are the rates supported in North American digital telephone system.
| Designation | Data Rate(MBPS) | Number of voice channels |
|---|---|---|
| DS-1 | 1.544 | 24 |
| DS-2 | 6.312 | 96 |
| DS-3 | 44.736 | 672 |
| DS-4 | 274.176 | 4032 |
SONET
Following are the rates supported in SONET system.
| Designation | Data Rate(MBPS) | Number of voice channels |
|---|---|---|
| OC-1 | 51.84 | 672 |
| OC-3 | 155.52 | 2016 |
| OC-12 | 622.08 | 8064 |
| OC-18 | 933.12 | 12,096 |
| OC-24 | 1244.16 | 16,128 |
| OC-36 | 1866.24 | 24,192 |
| OC-48 | 2488.32 | 32,256 |
| OC-96 | 4976.64 | 64,512 |
| OC-192 | 9953.28 | 129,024 |
SDH
Following are the rates supported in SDH system.
| Designation | Data Rate(MBPS) | Number of voice channels |
|---|---|---|
| STM-1 | 155.52 | 2016 |
| STM-4 | 622.08 | 8064 |
| STM-16 | 2488.32 | 32,256 |
| STM-64 | 9953.28 | 129,024 |
In SONET and SDH, OC-192 level supports maximum data rate of about 9953.28Mbps, but with recent dvelopments in SDH data rate upto 40Gbps can also be achieved.
What is Difference between
PDH vs SDH
SONET versus SDH
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Difference between 802.11 standards viz.11-a,11-b,11-g and 11-n
FDM vs TDM