SMDS
SMDS stands for switched multi-megabit data service. By definition, SMDS is a high-performance, connectionless telecommunications service for packet switched data transport. An important thing to keep in mind about this service is that it is neither a protocol nor a technology. The SMDS service provider has absolute control over the use of more unique addresses, however the customer has absolute control over individual addresses. An Individual Address is a media access control layer (MAC) address in an E.164 format, and the customer can assign several addresses (up to sixteen for each individual SNI) to a single Customer Premise Environment (CPE) or assign assign a group address to several hardware devices. SMDS is often compared with ATM because of certain similarities. Both use cell relay transport, however ATM has a maximum length, which are 56,347 octets larger than SMD
S. A common usage of SMDS is to have it run as a server within an ATM network. This is beneficial because it creates a connectionless datagram service with SMDS, and still utilizes all the benefits of an ATM network. Metropolitan Area Networks (MAN) is the interconnection of several SMDS or DQDB sub-networks. MANs are similar to packet switched networks the way cells are routed, however the bandwidth is 155 Mbps. A MAN operates on a DQDB bus, which acts like a local area network where each bus has equal access to the bandwidth. The backbone of SMDS can be made up of several MAN switching Systems (SSs). In distributed architecture, several switching systems (SSs) are responsible for the formation of the SMDS network. Bellcore, which is the same company that is responsible for the interface protocol for SMDS, has set standards which define the (SS) “..as a collection of
Some topics in this essay:
Environment CPE,
Systems SSs,
,
Dual Bus,
SMDS DQDB,
Customer Premises,
LANs FDDI,
Individual Address,
Metropolitan Networks,
mac sub-layer,
dual bus,
switching systems sss,
smds dqdb,
systems sss,
packet switched,
fault tolerance,
absolute control,
bus topology,
switching systems,
cell relay,
interface protocol smds,
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Approximate Word count = 595
Approximate Pages = 2 (250 words per page double spaced)
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