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Disconnecting Terminals From a Multi-Drop Network Without Network Downtime

IP.com Disclosure Number: IPCOM000047104D
Original Publication Date: 1983-Sep-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Woessner, RJ: AUTHOR

Abstract

The cable connectors, terminating resistor, and cable switch for a network station are placed in a separate box which can be unplugged as a unit from the station, so that the station itself can be physically removed from a multi-drop network without interrupting any other stations on the network. Present display terminals 10 have a non-removable system-interface panel 11 containing connectors 12 for connecting cables 13 between each other and a host computer in a multi-drop configuration, as shown in Fig. 1. Other functions are sometimes packaged within this panel, such as a switch 14 for connecting a terminating resistor in the last terminal on the cable.

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Disconnecting Terminals From a Multi-Drop Network Without Network Downtime

The cable connectors, terminating resistor, and cable switch for a network station are placed in a separate box which can be unplugged as a unit from the station, so that the station itself can be physically removed from a multi-drop network without interrupting any other stations on the network. Present display terminals 10 have a non-removable system-interface panel 11 containing connectors 12 for connecting cables 13 between each other and a host computer in a multi-drop configuration, as shown in Fig. 1. Other functions are sometimes packaged within this panel, such as a switch 14 for connecting a terminating resistor in the last terminal on the cable. If one of the terminals must be removed from the system for repair, the entire network must be interrupted until the drop cables can be reconnected to each other to bypass the failing terminal. This also requires a separate part, a feedthrough coupler, which can be misplaced. Fig. 2 shows the exterior of a minimum-function panel 21 containing two cable connectors 22, terminator switch 24, and a two-pin connector 25 for connection to a mating connector or cable in the terminal (not shown). Holes 26 allow panel 21 to be mounted to the terminal by screws, snap fasteners, or any other convenient means. Fig. 3 is a circuit diagram of panel 21, including terminating resistor Ro. Other functions, such as address switching, could be included in...