Browse Prior Art Database

Multi-Terminal Discriminator

IP.com Disclosure Number: IPCOM000038639D
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Abramson, P: AUTHOR [+3]

Abstract

This article describes a circuit arrangement which allows a single outlet in an office to support different types of data terminal equipment (DTE). The circuit arrangement analyzes the frequency spectrum of signals generated by the DTE and directs the signal to the respective systems. As can be seen in the drawing, each of the systems identified as Systems A, B, and C is coupled by respective FET switches to communications media 10. The signals on communications media 10 are outputted from a DTE (not shown) which wants to communicate with System A or System B or System C. A plurality of tuned circuits identified by numerals 12, 14 and 16 are connected through respective resistors to operational amplifier 18. Each of the tuned circuits is allowed to pass signals in the frequency range of a utilization system.

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Multi-Terminal Discriminator

This article describes a circuit arrangement which allows a single outlet in an office to support different types of data terminal equipment (DTE). The circuit arrangement analyzes the frequency spectrum of signals generated by the DTE and directs the signal to the respective systems. As can be seen in the drawing, each of the systems identified as Systems A, B, and C is coupled by respective FET switches to communications media 10. The signals on communications media 10 are outputted from a DTE (not shown) which wants to communicate with System A or System B or System C. A plurality of tuned circuits identified by numerals 12, 14 and 16 are connected through respective resistors to operational amplifier 18. Each of the tuned circuits is allowed to pass signals in the frequency range of a utilization system. Thus, tuned circuit 12 is allowed to pass signals in the frequency range of System A, tuned circuit 14 is allowed to pass signals in the frequency range of System B, and tuned circuit 16 is allowed to pass signals in the frequency range of System C. The input of operational amplifier 18 is tied to communications media 10 and amplifies signals outputted from a DTE (not shown). Suppose an attaching DTE wishes to communicate with System A, operational amplifier 18 amplifies the signal outputted from the DTE (not shown) and supplies it to tuned circuit 12. Tuned circuit 12 then generates a signal which is used to activate FET 8 which...