Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Bus or line termination
Patent
1998-07-20
2000-07-11
Tokar, Michael
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Bus or line termination
333101, 333 22R, H03K 1716
Patent
active
060878487
ABSTRACT:
Systems and methods are described for implementing a backplane in the context of a stack of networking hubs based on a backplane connecter and for carrying out a method of configuring and terminating the backplane. A backplane connector includes a first voltage source; a plurality of connector contacts; a plurality of termination resistors, a first end of the plurality of termination resistors being coupled to the plurality of connector contacts; a first switch located between the first voltage source and a second end of the plurality of termination resistors; a first logic circuit coupled to the first switch, the first logic circuit closing the first switch when a layer composed by the backplane connector is both i) active and ii) either a top layer in a stack composed by the layer or a bottom layer in the stack. The systems and methods provide advantages in that a plurality of stackable network hubs can be economically coupled together with automatic impedance matching and the ability to power down one or more layers in a stack without disrupting data flow between other layers in the stack.
REFERENCES:
patent: 5645434 (1997-07-01), Leung
patent: 5961619 (1999-10-01), Voloshin
Lin Jung-Chen
Mo Lawerence W.
Kendin Semiconductor, Inc.
Tokar Michael
Tran Anh
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