Mehmet H Duymazlar10 Sudbury Dr, Nashua, NH 03062

7428208, Sep 23, 2008

Oct 21, 2002

10/277023

John Patrick Jones - Westford MA, US
Michael Paul Demilia - Sterling MA, US
Ronald Mark Parker - Boxborough MA, US
Mehmet Hakan Duymazlar - Nashua NH, US

Ciena Corporation - Linthicum MD

G01R 31/08

370216, 370218

Multi-service telecommunication switches which include enhanced component redundancy and which also allow multiple chassis connections to a switching fabric enhance the likelihood that packets transmitted to and from the switch will not be lost due do a particular component failure and also enable chassis stacking in a rack system. Such a multi-service telecommunication switch includes redundant physical layer adapter cards, redundant service cards, redundant timing modules, and redundant switching fabrics. Further, the multi-service telecommunication switch, includes an enhanced data flow distribution (load-balancing) architecture which enables multiple chassis connections to the switching fabrics.

6008550, Dec 28, 1999

Mar 25, 1999

9/276335

Paul C. Dorsey - Merrimack NH
Kevin M. Frazier - Reading MA
David J. Breig - Maple Grove MN
Mehmet H. Duymazlar - Nashua NH

Cabletron Systems, Inc. - Rochester NH

H01H 700

307141

A system for controlling power application to an electronic component during a hotswap operation. A chassis contains a plurality of slots for interfacing with electronic components, each slot having an associated timing device. The electronic component contains a delay mechanism, such that when the electronic component interfaces with a slot in the chassis, the delay and timing mechanisms interact to create a slot timing circuit. The slot timing circuit interfaces to a ramp-up switching circuitry to produce a controlled application of power to remaining circuitry of the electronic component. The timing mechanism may be a resistor and the delay mechanism may be a capacitor, such that an RC circuit is formed which controls, in a time delayed fashion, a switching mechanism which in turn controls ramp-up of power application to the electronic component. Furthermore, each timing mechanism of each slot in the chassis may have a different timing value, such that power application to multiple electronic components, inserted simultaneously into the chassis, may have power applied in a staggered fashion, to prevent inrush and surge currents to the power supply. Still further, each switching mechanism of an electronic component may have an associated power control circuit, which when activated by the slot timing circuit, controls ramp-up of power application to remaining circuitry of the electronic component in a controlled fashion.