SMDS
SMDS Abbrev. for switched multimegabit data service. A switched broadband service that is being introduced by a number of public network operators (PNO). The intention is that SMDS will support data services at a range of bit rates from 1.536 Mbps (2.048 Mbps in Europe) up to 45 Mbps (34 Mbps in Europe) and subsequently at higher speeds, certainly as high as 155 Mbps. SMDS is a connectionless system, based on variable-length packets with a payload of up to 9188 bytes. Each packet contains both the source and destination addresses, the addresses being the same as ISDN addresses and globally unique.
SMDS offers the end-user access at a range of predetermined bit rates (e.g. 2, 4, 10, 16, and 25 Mbps), treating these as average bit rates that cannot be exceeded, while using a fixed bit rate bearer (in this case of 34 Mbps) between the SMDS access points. A control algorithm in the access unit ensures that the average rate at which the end-user can submit data for transmission cannot be exceeded. There are no restrictions on the rate at which the user can receive data, since it is possible for data to arrive from a number of separate subscribers at a rate that would exceed the average rate at which a user can transmit. This allows the PNO to offer a service tailored to the end-users' overall needs, together with the ability to upgrade between one bit rate and the next by simply resetting the values of the control parameters in the access unit.
SMDS offers the end-user access at a range of predetermined bit rates (e.g. 2, 4, 10, 16, and 25 Mbps), treating these as average bit rates that cannot be exceeded, while using a fixed bit rate bearer (in this case of 34 Mbps) between the SMDS access points. A control algorithm in the access unit ensures that the average rate at which the end-user can submit data for transmission cannot be exceeded. There are no restrictions on the rate at which the user can receive data, since it is possible for data to arrive from a number of separate subscribers at a rate that would exceed the average rate at which a user can transmit. This allows the PNO to offer a service tailored to the end-users' overall needs, together with the ability to upgrade between one bit rate and the next by simply resetting the values of the control parameters in the access unit.
More From encyclopedia.com
you'll find our current interest rate very competitive. , rate1 / rāt/ • n. 1. a measure, quantity, or frequency, typically one measured against some other quantity or measure: the crime rate rose by 26 perc… MCAV Abbrev. for modified constant angular velocity. , MCAV Abbrev. for modified constant angular velocity. A modification of CAV in which the rotation rate of the disk is constant but the clock rate and… Infant Mortality , Definition
The infant mortality rate is the number of deaths of infants under one year of age per 1,000 live births in a given population. In 2002, t… SDH Abbrev. for synchronous digital hierarchy. , SDH Abbrev. for synchronous digital hierarchy. A set of CCITT standards, and products that implement those standards, intended to support high-speed… Raid , RAID Acronym for redundant array of independent disks (or drives). A storage system based on a disk array that holds a certain amount of redundant in… Isdn (network Standards) , ISDN Abbrev. for integrated services digital network. ISDN has been developed, primarily by the PTTs, as a vehicle for the provision of a single serv…
You Might Also Like
NEARBY TERMS
SMDS