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Logitech PowerPlay is a mousepad underlay which can charge compatible mice both at rest and while they are in use. It connects to the computer via USB and, on the pad side, features a control module which a compatible mouse can connect to via the proprietary Lightspeed protocol.
The keyboard itself was an intelligent device and had its own processor and 4 kilobytes of RAM for keeping a buffer of the sequence of keys that were being pressed, thus can communicate with the user if a fault is found by flashing its main LED in sequence:
A G.703 E1 link is typically, though not necessarily, framed using the G.704 standard which divides the data stream into time slots. Typically, each time slots represents an E0 (64 kbit/s) voice channel encoded using pulse-code modulation (PCM). The PCM coding is defined in the G.711 standard. G.704 also includes a control timeslot slot and a ...