Abstract: Aspects of the present disclosure provide a system for abating a hydrocarbon compound (HCC) in air using photocatalytic oxidation (PCO). For example, the system can include an air handling unit (AHU), a sensor and a control panel. The AHU can be configured to abate HCC in air using PCO. The sensor can be configured to sense a level of the HCC in the air. The control panel can be configured to control the AHU based on the level of the HCC.

Abstract: The present disclosure provides a system and method for securing the connection between drawbars of carts and hitches. The system and method involves limiting the drawbar's freedom to pivot once the drawbar is coupled to a hitch.

Abstract: The present disclosure provides a system and method for securing the connection between drawbars of carts and hitches. The system and method involves limiting the drawbar's freedom to pivot once the drawbar is coupled to a hitch.

Abstract: An assembly for use in the digging or cleaning of irrigation laterals (spurs). The resulting lateral (spur) will be in a trapezoidal shape, allowing better lateral (spur) erosion control, better control of lateral (spur) edge collapse, and greater water flow when compared to the more standard rectangular shaped laterals (spurs).

Abstract: A method of synchronising first and second clocks coupled respectively to ingress and egress interfaces 6,7 of a packet network 1, the method comprising calculating a minimum packet Transit Time over the network 1 in each of successive time intervals, and varying the frequency of the second clock so as to track variations in the minimum packet Transit Time.

Abstract: A method for distributing timing information across a packet network includes generating timing signals at a master clock at predictable intervals using a clock reference of a given frequency. The timing signals are broadcast or multicast to a plurality of slave clocks over the packet network, preserving the timing signal intervals. At each slave clock, the intervals between successively received timing signals are determined. A clock recovery algorithm is applied to the determined intervals to recover in substantially real time the original clock frequency. The local clock frequency of the slave clock is synchronized to the recovered frequency.

Abstract: A method of synchronising first and second clocks coupled respectively to ingress and egress interfaces 6,7 of a packet network 1, the method comprising calculating a minimum packet Transit Time over the network 1 in each of successive time intervals, and varying the frequency of the second clock so as to track variations in the minimum packet Transit Time.

Abstract: A method of updating a lookup table associated with a TDM transmit unit which is coupled to a packet network to receive data therefrom, the lookup table mapping packet network contexts to TDM channels. The method includes priming a controller with data for updating the lookup table in advance of the receipt of packets containing data to which the update relates, incorporating a flag in each packet sent over the packet network to the TDM transmit unit, the flag being set to indicate whether or not a packet is the first packet to which the update relates, and detecting the setting of the flag in a first packet and in response updating the lookup table with the update data.

Abstract: A method of mapping between contexts of a packet network and TDM channels and streams. The method comprises constructing a lookup table defining the sequence in which data is to be mapped between contexts and TDM channels and streams, and including for each row of the table a flag which indicates whether or not that entry is the first entry in the table for the corresponding context. As the TDM receive or transmit entity cycles through the lookup table, use is made of the flags to synchronize the start of each packet with the first entry of a TDM frame for each context.

Abstract: A method of providing data for transmission on a time division multiplexed (TDM) serial data stream. The method comprises mapping channels of the TDM stream to contexts, each context comprising a set of memory buffers for storing data to be transmitted. Data is extracted from the contexts in a sequence defined by said mapping and transmitting the extracted data on the TDM stream. When a buffer or buffers of a context become empty, a buffer refill request is generated to cause data to be read from a memory to refill the buffer, wherein each buffer refill request is assigned a priority. The context buffers are refilled in an order defined by the respective priorities of the refill requests.

Abstract: A method of synchronising first and second clocks coupled respectively to ingress and egress interfaces 6,7 of a packet network 1, the method comprising calculating a minimum packet Transit Time over the network 1 in each of successive time intervals, and varying the frequency of the second clock so as to track variations in the minimum packet Transit Time.

Abstract: A method of distributing timing information across a packet network 7. The method comprises generating timing signals at a master clock 8 at predictable intervals using a clock reference of a given frequency. The timing signals are broadcast or multicast to a plurality of slave clocks 9 over said packet network 7, preserving the timing signal intervals. At each said slave clock 9, the intervals between successively received timing signals are determined. A clock recovery algorithm is applied to said determined intervals to recover in substantially real time the original clock frequency. The local clock frequency of the slave clock is synchronised to the recovered frequency.

Abstract: A system is provided for transmitting constant bit rate data across a packet network, the system comprising:

Abstract: A system is provided for processing requests for service from a plurality of modules, the system including a processor arranged to process the requests a FIFO queue means providing a FIFO queue for storing the identities of the modules, and control means for placing in the FIFO queue the identities of modules requiring service by the processor. When the processor is ready to service another module the processor reads the identity of the module at the head of the FIFO queue, and services that module.

Abstract: A method of mapping between contexts of a packet network and TDM channels and streams. The method comprises constructing a lookup table defining the sequence in which data is to be mapped between contexts and TDM channels and streams, and including for each row of the table a flag which indicates whether or not that entry is the first entry in the table for the corresponding context. As the TDM receive or transmit entity cycles through the lookup table, use is made of the flags to synchronize the start of each packet with the first entry of a TDM frame for each context.

Abstract: A method of updating a lookup table associated with a TDM transmit unit which is coupled to a packet network to receive data therefrom, the lookup table mapping packet network contexts to TDM channels. The method includes priming a controller with data for updating the lookup table in advance of the receipt of packets containing data to which the update relates, incorporating a flag in each packet sent over the packet network to the TDM transmit unit, the flag being set to indicate whether or not a packet is the first packet to which the update relates, and detecting the setting of the flag in a first packet and in response updating the lookup table with the update data.

Abstract: A TDM transmitter system for receiving packets of TDM data from a packet network and transmitting these on a TDM network. The TDM transmitter system includes a packet receiver arranged to receive the packets from the packet network, a buffer memory for storing packets received by the receiver, and a TDM transmitter arranged to receive the packets from the memory buffer, convert these to TDM data for transmission on a TDM network, and transmit said TDM data on a TDM network. The TDM transmitter of the TDM data corresponding to the first packet is delayed for a programmable number of TDM frame periods.

Abstract: A method of providing data for transmission on a time division multiplexed (TDM) serial data stream. The method comprises mapping channels of the TDM stream to contexts, each context comprising a set of memory buffers for storing data to be transmitted. Data is extracted from the contexts in a sequence defined by said mapping and transmitting the extracted data on the TDM stream. When a buffer or buffers of a context become empty, a buffer refill request is generated to cause data to be read from a memory to refill the buffer, wherein each buffer refill request is assigned a priority. The context buffers are refilled in an order defined by the respective priorities of the refill requests.

Abstract: An air amplifier device has a body with two pieces which fit together and have an inner wall defining a generally cylindrical cavity with a center axis and with an entrance opening at its upper end and an exit opening at its other end. The two pieces have respective shoulders which abut to index the pieces in precise relationship radially, axially, and longitudinally. A pair of circular lips in the inner wall near the entrance opening form a venturi jet air opening through the inner wall to direct a controlled flow of air from a supply of air down into the cylindrical cavity. The lips are uniformly parallel with each other and concentric with the center axis, are closely and uniformly spaced apart for 360 degrees around their lengths and are two circular edges of the respective pieces, and are indexed to the respective shoulders of the pieces such that when the pieces are assembled the jet air opening is uniform within a fraction of a thousandth of an inch.