SMDS


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SMDS

SMDS

(Switched Multimegabit Data Service) A high-speed, switched data communications service offered by the local telephone companies for interconnecting LANs in different locations. It was introduced in 1992 and became generally available nationwide by 1995.

Connection to an SMDS service can be made from a variety of devices, including bridges, routers, CSU/DSUs as well as via frame relay and ATM networks. SMDS can employ various networking technologies. Early implementations use the IEEE 802.6 DQDB MAN technology at rates up to 45 Mbps.

Data are framed for transmission using the SMDS Interface Protocol (SIP), which packages data as Level 3 Protocol Data Units (L3_PDU). The L3_PDU contains source and destination addresses and a data field that holds up to 9188 bytes.
References in periodicals archive ?
We're using SMDS to make it look like they're on our LAN," says Brenckle.
There is a monthly cost for the local loop and a monthly cost for the SMDS service based on the speed of the access.
In December 1994, the company's three Baltimore locations were linked with two fully redundant 4 Mb/s SMDS rings served by separate Bell Atlantic wire centers.
We compared the cost of converting our original eight locations with either dedicated lines or SMDS links," says Wayock.
Arguments for SMDS include the cost-effectiveness of a public switched network, fully-meshed wide area interconnection and the privacy and control of dedicated private networks.
SMDS uses public packet switched networks to provide data transport at access rates ranging from 1.
It believes SMDS will help the RBOCs enter the fast data networking marketplace.
It also puts a question mark over SMDS (Switched Multimegabit Data Service) and Broadband ISDN.