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14 ) SONET is a ring based fiber WAN technology primarily often in the OCx Capacities I/E OC1,3,192,768, or higher tiers Synchronous Digital Hierarchy dose much the same and is modestly different as a European standard. The differences and similarities often resulted in much interoperability and transparency with the systems. ATM and other TCP/IP data traffic is often transmitted over SONET or SDH, since SDH and SONET are marginally different.

SDH was in fact a newer protocol from SONET, since SONET has already a large market segment in the US and Canada, and they are compatible protocols, I/E Ethernet and Ethernet II , despite Ethernet’s improvements the fact the older and newer protocols can be understood makes SDH and SONET interoperability in Edge networks a work in much the same way as Ethernet to an Ethernet II network. SDH is the newer and more widely used over SONET as of recent years since it was born out of SONET it is understandably like Ethernet II backward compatible with Ethernet I

Likewise there is newer Nomenclature between SONET and the newer SDH, as well as differences in Packets and data frames.

14) CIR or Committed information rate is the Mean speed the ISP or Carrier will guarantee some offer SLA’s for more data above the plan in bursts as EIR or PIR excess information rate or Peek information rate , the MAR is the Maximum information rate normally sustainable in burst capacities that is allowable.

Chapter 10 MINI CASE I )

Honestly despite the claims DSL doesn’t have a shared architecture , you’d be lying as well DSL tends to suffer from attenuations and other things that greatly degrade its performance in a non last few feet over copper operation. I have personally used the two technologies often in the field under differing conditions and as a field repair technician for several IT contractors first it greatly depends on whom is your cable provider, Comcast in many cases especially in Indianapolis has reliability , and a...