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Browse Prior Art Database

Supporting USB 2.0 in BladeCenter

IP.com Disclosure Number: IPCOM000130150D
Original Publication Date: 2005-Oct-13
Included in the Prior Art Database: 2005-Oct-13
Document File: 1 page(s) / 25K

Publishing Venue

IBM

Abstract

The current BladeCenter chassis does not support USB 2.0. The current USB structure is arranged as a multidrop bus. The loading and stubs presented by the multiple drops are unsuitable for running the bus at USB 2.0 speeds. The USB bus connections must be reorganized to allow the USB signals to pass without significant signal degredation.

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Supporting USB 2.0 in BladeCenter

     The current BladeCenter chassis does not support USB 2.0. The current USB structure is arranged as a multidrop bus. The loading and stubs presented by the multiple drops are unsuitable for running the bus at USB 2.0 speeds. The USB bus connections must be reorganized to allow the USB signals to pass without significant signal degredation.

     This article describes a system that allows each of the 14 blades contained in a BladeCenter chassis to communicate with a USB 2.0 device at high speed. It accomplishes this task by reducing the loading and stubs present on the USB channel and allowing a true point to point connection. The multidrop USB bus is replaced with a tree structure. In this example, the tree is two levels and is contructed with dual 4:1 multiplexers. The bus loading is reduced from 14 capacitive FET switch loads to 2.

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