Zarlink Semiconductor Limited

Nandbox Inc.

Hazem Abdel-Maguid

Simon John Skierszkan

Abdelrahman Amer

Youcef Fouzar

Ranjit Singh

Multiple profiles are received in association with a first user account in an asynchronous messaging system. One or more of the profiles are associated with other user accounts. The associated profiles are transmitted to user clients associated with the other user accounts for storage as a local copy. The association may include inclusion in a contact list of the first user, or a contact list of the other users. The associated profiles are transmitted when messages are sent from the first account to the other user clients, or the profiles are created or updated. A public profile may include a version identifier which is updated when the public profile is updated. Updates to local copies of the public profile at other user clients may occur only when a local copy of the associated version identifier indicates that the local profile is outdated, thereby reducing network traffic.

Managing multiple profiles for a single account in an asynchronous messaging system

A voltage controlled oscillator generates an output signal whose frequency varies as a first function of a control voltage applied to a control terminal. The voltage controlled oscillator has a wide range of frequency of operation. A gain adjust circuit adjusts the gain of the voltage controlled oscillator such that the first function varies as a second function of the gain. In a preferred embodiment the gain adjust circuit includes a variable impedance that may be external or integrated onto a common chip with the oscillator core.

Capture range control mechanism for voltage controlled oscillators

A digital phase locked loop (PLL) for recovering a stable clock signal from at least one input signal subject to jitter. The PLL has a digital controlled oscillator for generating a desired output and a stable local oscillator or providing clock signals. A plurality of hierarchical, multi-stage delay lines are provided to generate the required output frequencies for stable T1, E1 and ST3/OC3 timing references.

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Ottawa, Canada

Hazem Abdel-Maguid