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SONET and SDH

SONET and SDH

(OP)
Hi,
is there a link which shows the role of SONET/SDH is a "light way"?
Why don't we use the Ethernet protocol? Let's assume that we have a university campus which we would like to connect to another campus through a router. A single mode fiber optic cable will be laid between the 2 sites. Why Should we use SONET and not Ethernet?

Thanks,

S. Fray

RE: SONET and SDH

Distance is the main factor

RE: SONET and SDH

(OP)
Thanks Trotski. What is the maximum distance we should not go beyond using Ethernet? (Over Single mode fiber optic cable)

RE: SONET and SDH

It really does depend on the Switches that you are using I have used HP procurve Switches over 5km between buildings with no problems. HP could tell you the Max Distance(or any other Manufacturer)
You need to look at the power loss (in db)over the length of cable and source equipment that will give you an acceptable figure from a bit error rate test(BERT)
within a Campus I would use Ethernet, Inter City or across a large city,or with very high data through put use SONET/SDH

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