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Multidrop Interconnection System With Non-disruptive Unit Addition

IP.com Disclosure Number: IPCOM000061901D
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Chesarek, DJ: AUTHOR

Abstract

This article describes a means to implement a multidrop connection between logic units in a series of mechanically conne boxes. The key new capability is the ability to add new units to the existing multidrop system in a non-disruptive manner. The scheme uses a cable comprised of a plurality of twisted pairs in a "flat" package. Every 18 inches, the wires of each twisted pair are separated to form a conventional flat cable with parallel wires. Connections are made to the cable at sets of connectors mounted in the regions with parallel wires.

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Multidrop Interconnection System With Non-disruptive Unit Addition

This article describes a means to implement a multidrop connection between logic units in a series of mechanically conne boxes. The key new capability is the ability to add new units to the existing multidrop system in a non-disruptive manner. The scheme uses a cable comprised of a plurality of twisted pairs in a "flat" package. Every 18 inches, the wires of each twisted pair are separated to form a conventional flat cable with parallel wires. Connections are made to the cable at sets of connectors mounted in the regions with parallel wires.

The new multidrop connection scheme works as follows: 1. Differential balanced driver/receivers are used. 2. During the cable assembly process, the wire is cut to the maximum length which would be required to interconnect a "full" string and connectors are installed along the cable at the appropriate points. 3. A terminator is attached to the end of the cable. 4. The cable is rolled up from the terminator end, except for that portion which is required in the first unit. 5. The cable is installed in the first unit with the rolled up portion appropriately supported, e.g. on a shelf, suspended. 6. When a new unit is to be added, it is mechanically attached to the last unit in the existing string. 7. The cable is unrolled a fixed amount and fed between the boxes. 8. The connectors are attached to the corresponding connectors in the new unit and the remaining roll ...