Browse Prior Art Database

Network Control Unit Coax Protocol Simulator/ Verifier

IP.com Disclosure Number: IPCOM000049942D
Original Publication Date: 1982-Aug-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Knight, SA: AUTHOR

Abstract

A programmable coaxial network unit controller provides the ability to control the content and timing of a coax line communication protocol. In the past, each time a new type of computer was used, a new coax line communication interface was developed. The protocol standard has been to make the terminal computers adhere to the protocol of the host computer coax control unit. The present arrangement provides a simulator/ verifier which can simulate the network protocol and function as either a coax control unit or a coax adapter. The simulator/ verifier furnishes good and bad commands, responses and data in any combination.

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Network Control Unit Coax Protocol Simulator/ Verifier

A programmable coaxial network unit controller provides the ability to control the content and timing of a coax line communication protocol. In the past, each time a new type of computer was used, a new coax line communication interface was developed. The protocol standard has been to make the terminal computers adhere to the protocol of the host computer coax control unit. The present arrangement provides a simulator/ verifier which can simulate the network protocol and function as either a coax control unit or a coax adapter. The simulator/ verifier furnishes good and bad commands, responses and data in any combination.

The simulator/ verifier (Fig. 1) includes a keyboard and cathode ray tube (CRT) display 10 which connects to a TTY (telecommunications) interface 15. The control unit 200 under test is connected via coax line 150 to driver/receiver (D/R) 90 which is also connected to a host system 125 via coax line 100. Host system 125 provides program object code and read/write data. The driver/receiver 90 connects to SERDES (Serializer-Deserializer) 70 for writing data to and reading data from a coaxial line (Figs. 2 and 3, respectively) under control of microprocessor 50.

In order to force even parity, for example, microprocessor 50 sets bit 3 of register 20 to a one. Protocol timings are controlled by microprocessor 50 which can set bit 6 or 7 of register 20 to turn on the drivers or receivers, respectiv...