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Callan
Jim Callan, Grays GB
| Patent application number | Description | Published |
|---|---|---|
| 20090008895 | Vehicle having an Elevated Cab and Access Steps - A vehicle with an elevated cab is provided with a power driven access step that is capable of being moved between an operating lower position and a raised stowage position. The step is carried by at least one telescopically collapsible tubular strut and an actuator is housed within the strut for raising and lowering the step by extending and contracting the strut. | 01-08-2009 |
Jonathan Sean Callan, Cambridge GB
| Patent application number | Description | Published |
|---|---|---|
| 20100217937 | Data processing apparatus and method - A data processing apparatus is described which comprises a processor operable to execute a sequence of instructions and a cache memory having a plurality of cache lines operable to store data values for access by the processor when executing the sequence of instructions. A cache controller is also provided which comprises preload circuitry operable in response to a streaming preload instruction received at the processor to store data values from a main memory into one or more cache lines of the cache memory. The cache controller also comprises identification circuitry operable in response to the streaming preload instruction to identify one or more cache lines of the cache memory for preferential reuse. The cache controller also comprises cache maintenance circuitry operable to implement a cache maintenance operation during which selection of one or more cache lines for reuse is performed having regard to any preferred for reuse identification generated by the identification circuitry for cache lines of the cache memory. In this way, a single streaming preload instruction can be used to trigger both a preload of one or more cache lines of data values into the cache memory, and also to mark for preferential reuse another one or more cache lines of the cache memory. | 08-26-2010 |
Paul Alexander Callan, Leicestershire GB
| Patent application number | Description | Published |
|---|---|---|
| 20110176802 | Channel Power Control in an Optical Network Node - A method and apparatus suitable for controlling the power of a channel in an optical network are described. A control system for a variable optical attenuator includes a processing element arranged to: (a) receive a signal indicative of the radiation power of an optical signal output from a variable optical attenuator; (b) determine an error signal in dependence upon the received signal and a predetermined target radiation power level; (c) determine a control signal for controlling the attenuation of the variable optical attenuator in dependence upon the error signal and a gain factor; and (d) repeat the operations of (a) to (c). The control system is arranged to utilize a first value of the gain factor during a first time period and a second, lower value of the gain factor during a second time period. Such a control system can be used to control the introduction of a channel in a node of an automatically switched optical network. | 07-21-2011 |
Paul Alexander Callan, Loughborough GB
| Patent application number | Description | Published |
|---|---|---|
| 20110243555 | CHANNEL POWER CONTROL IN AN OPTICAL LINK - Methods and apparatus for control of variable optical attenuators are described. A method for control of a variable optical attenuator located in an optical link comprising a plurality of optical attenuators. The method comprises determining that an initial calibration step of a variable optical attenuator has been completed, and transmitting a signal indicative of the variable optical attenuator having completed the initial calibration step for receipt by a downstream variable optical attenuator. A method of controlling a variable optical attenuator comprises receiving a signal indicative of an upstream variable optical attenuator having completed an initial calibration step, and initiating calibration of the variable optical attenuator in response to receipt of said signal. | 10-06-2011 |