Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

RTPC 8-Port Fanout Assemblies

IP.com Disclosure Number: IPCOM000036475D
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Hatcher, SC: AUTHOR [+4]

Abstract

Disclosed is a set of two 8-port asynchronous communication fanout assemblies in which each allows connection of up to eight devices (modems, printers, plotters, terminals, etc.) to a single RT PC adapter. These assemblies must provide adequate shielding and signal integrity and allow the use of existing device cables between the fanout assembly and the attached devices.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 71% of the total text.

Page 1 of 1

RTPC 8-Port Fanout Assemblies

Disclosed is a set of two 8-port asynchronous communication fanout assemblies in which each allows connection of up to eight devices (modems, printers, plotters, terminals, etc.) to a single RT PC adapter. These assemblies must provide adequate shielding and signal integrity and allow the use of existing device cables between the fanout assembly and the attached devices.

Existing RTPC asynchronous communication cables attach to the computer with AMP Mod-U connectors, a six-pin attachment for RS 422-A and a ten-pin attachment for RS 232-C and/or Mil STD 188. The size of the bulkhead opening for an adapter is not large enough for attachment of more than four of these connectors. Accordingly, a single larger connector was chosen for the bulkhead attachment to the fanout assembly, a 37-pin "D" shell for the RS 422-A adapter and a 79-pin "D" shell for both the RS 232-C and the Mil STD 188 adapters.

To maintain signal integrity and reduce crosstalk among the eight independent sets of signals in the attached cable, each set of signal wires is bundled into a separate shield within the larger, shielded and jacketed cable. The individual shields each have a drain wire that is connected to frame ground through the 79 (or 37)-pin connector. The external shield is connected via copper tape to the shell of the connector and thence to frame ground.

The strain relief of this cable into the fanout box also connects to the external shield. Shielding i...