Browse Prior Art Database

High Speed Crosspoint Interface

IP.com Disclosure Number: IPCOM000076741D
Original Publication Date: 1972-Apr-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Wheeler, AD: AUTHOR [+2]

Abstract

Shown in Fig. 1 is a portion of a crosspoint interface. The interface connects input/output control units to input/output devices, such as tape drives. The interface is modularized, in that four crosspoints and the associated drive transistor for the crosspoint switching are built as an integrated structure. The integrated structure is shown in Fig. 2.

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High Speed Crosspoint Interface

Shown in Fig. 1 is a portion of a crosspoint interface. The interface connects input/output control units to input/output devices, such as tape drives. The interface is modularized, in that four crosspoints and the associated drive transistor for the crosspoint switching are built as an integrated structure. The integrated structure is shown in Fig. 2.

The modularized crosspoint switch in Fig. 2 is made up of four transistors 12 which control interconnection of input and output lines, and a fifth drive transistor 14 to turn transistors 12 on or off. Drive transistor 14 is turned on and off by the voltage on device-select line 16. When drive transistor 14 is turned on, all of transistors 12 are conducting.

To match the switches to transmission line impedance, inductor 18 may be added to each side of transistors 12.

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