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Switching at Work for Dual Hosts in a Multidrop Environment

IP.com Disclosure Number: IPCOM000062521D
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Buckton, WL: AUTHOR [+2]

Abstract

A switching network controls connection of one or more workstations in a multidrop network to one of two host systems while permitting other workstations in the network to be connected in an uninterrupted fashion to the other host. The figure shows the switching network which includes four relays K1, K2, K3 and K4. The relays are switched only during link idle time. The network includes two relays which break a single line into two separate lines, a third relay for switching in a terminating resistor and a fourth relay for providing the capability of monitoring either of the two lines which were formed by the break in the single line as a result of inserting the two relays discussed above.

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Switching at Work for Dual Hosts in a Multidrop Environment

A switching network controls connection of one or more workstations in a multidrop network to one of two host systems while permitting other workstations in the network to be connected in an uninterrupted fashion to the other host. The figure shows the switching network which includes four relays K1, K2, K3 and K4. The relays are switched only during link idle time. The network includes two relays which break a single line into two separate lines, a third relay for switching in a terminating resistor and a fourth relay for providing the capability of monitoring either of the two lines which were formed by the break in the single line as a result of inserting the two relays discussed above. The figure shows the monitor relay K1 having host 2 connected to the first workstation and relays K2, K3 and K4 configured to allow host 1 to communicate with a next workstation in the network. Relay K3 switches a terminating resistor RT1 in and out of the host 2 output line. Relay K4 in addition to switching between the workstation 1 and the next workstation, switches a terminating resistor RT2 in and out of the output line from workstation 1.

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