Browse Prior Art Database

High Speed Network Controller

IP.com Disclosure Number: IPCOM000045127D
Original Publication Date: 1983-Feb-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Aaker, KD: AUTHOR [+3]

Abstract

Network controller 20, attached to host system 10 via channel 15, normally controls coaxial cable attached systems 30 and 40. The length of attaching coaxial cable 25, as a practical matter, has a maximum limit for acceptable performance. Also, the network control unit 20 has a finite number of coaxial cables 25 which are available for connection to the remote systems. Further, the remote systems, such as systems 30 and 40, cannot communicate with each other in a peer to peer communications relationship because the network controller 20 and host system 10 are more general and do not perform the peer to peer function efficiently. In fact, when network control unit 20 and host 10 perform the peer to peer function, there is an exposure of lost data because the two systems, i.e.

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High Speed Network Controller

Network controller 20, attached to host system 10 via channel 15, normally controls coaxial cable attached systems 30 and 40. The length of attaching coaxial cable 25, as a practical matter, has a maximum limit for acceptable performance. Also, the network control unit 20 has a finite number of coaxial cables 25 which are available for connection to the remote systems. Further, the remote systems, such as systems 30 and 40, cannot communicate with each other in a peer to peer communications relationship because the network controller 20 and host system 10 are more general and do not perform the peer to peer function efficiently. In fact, when network control unit 20 and host 10 perform the peer to peer function, there is an exposure of lost data because the two systems, i.e., systems 30 and 40, can transmit requests simultaneously.

The problems of limited cable length, limited number of coaxial cables and inefficient peer to peer communications are solved by the extended network controller 100 which attaches to the network control unit 20 via one of the coaxial cables 25. The extended network controller 100 functions as a line extender and can attach systems 30 and 40 via coaxial cables 125 which can have the same length as the coaxial cables 25. Thus in addition to being a line extender, the extended network control unit 100 fans out a single coaxial cable 25 to a plurality of coaxial cables 125. The extended network control unit 10...