Interface Message Processors for the ARPA Computer Network
Quarterly technical rept. no. 3, 1 Jul-30 Sep 1973
BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA
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The ARPA computer network provides a communication medium which allows dissimilar computers Hosts to interchange information. Each Host is connected to an Interface Message Processor IMP, and IMPs are interconnected by leased common carrier circuits. There is frequently no direct circuit between two communicating Hosts, and the intermediate IMPs store and forward the information. IMPs regularly exchange information which is used to adapt routing to changing network conditions. IMPs also report a variety of parameters to a Network Control Center, which coordinates diagnosis and repair of malfunctions. The Terminal IMP TIP permits the direct attachment of 63 character-oriented terminals. The Satellite IMP SIMP will allow multi-station use of a single earth satellite channel. A High Speed Modular IMP HSMIMP is under development one goal of this effort is to increase IMP performance by an order of magnitude. Specialized mini-Hosts under development will provide for connection of remote batch terminals simulation of a leased point-to-point circuit encrypted Host communication.
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