Abstract: An LED module (200) comprising: a first set of LEDs (D1) for emitting illumination to illuminate an environment, arranged within a first circuit path; a second set of one or more LEDs (D2) for emitting light, arranged within a second circuit path; both the first and second sets being powered by a portion of the power received via a same pair of input terminals, and the first circuit path being longer than the second circuit path; and filter circuitry (206, 208) arranged to filter a modulation in the power received via the terminals, the filtering comprising allowing a component of the modulation at a predetermined modulation frequency to be passed only to the second set of LEDs (D2) and not the first set (D1), thereby causing a corresponding signal to be embedded in the light emitted by the second set but not in the illumination emitted by the first set.

Abstract: An LED module (200) comprising: a first set of LEDs (D1) for emitting illumination to illuminate an environment, arranged within a first circuit path; a second set of one or more LEDs (D2) for emitting light, arranged within a second circuit path; both the first and second sets being powered by a portion of the power received via a same pair of input terminals, and the first circuit path being longer than the second circuit path; and filter circuitry (206, 208) arranged to filter a modulation in the power received via the terminals, the filtering comprising allowing a component of the modulation at a predetermined modulation frequency to be passed only to the second set of LEDs (D2) and not the first set (D1), thereby causing a corresponding signal to be embedded in the light emitted by the second set but not in the illumination emitted by the first set.

Abstract: A method for routing is disclosed. The method comprises establishing an overlay network, comprising a plurality of network elements and an overlay controller; wherein the overlay controller is in communication with each network element via a secure tunnel established through an underlying transport network; receiving by the overlay controller, information from each service-hosting network element information said information identifying a service hosted at that service-hosting network element, and label associated with the service-hosting network element; identifying by the overlay controller, at least one policy that associates traffic from a site with a service; and causing by said overly controller, the at least one policy to be executed so that traffic from the site identified in the policy is routed using the underlying transport network to the service-hosting network element associated with the said service.