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You've got to admit, iRobot has done a terrible and confusing job of differenting their model numbers. NUMEROUS EXAMPLES: A 401 became the 4000. The 4100 become the 4300. Usually, higher model numbers are more advanced units, but the 4300 is clearly inferior to a 4260. A 4110 is the same Roomba as the 4105, but includes more accessories.
USRobotics Courier 2400 Modem with serial cable attached (mid-late 1980s) USR sold its first modem, the Courier , to corporate customers starting in 1979. In 1984, the breakup of AT&T greatly lowered the cost of the testing needed for connection to the telephone network, which led to lower prices and wider use of modems.
The Roomba 760 was the simplest model, and the Roombas 780 and 790 [46] were the most advanced, with both scheduling and a large range of accessories, including lighthouses, a wireless command center (also compatible with select retrofitted 500-series models), and extra brushes and filters. Besides these two models, Roomba 770 and 782e were ...
Xfinity Voice (formerly Comcast Digital Voice) is a Voice Over IP cable telephony service that was launched in 2005 in some markets, [75] and to all of Comcast's markets in 2006. Comcast's older service, Comcast Digital Phone, continued to offer service for a brief period, until Comcast shut it down around in late 2007. [ 76 ]
Brian L. Roberts. Comcast is described as a family business. [19] Brian L. Roberts, its chairman and CEO, is the son of founder Ralph J. Roberts (1920–2015). Roberts owns or controls about 1% of all Comcast shares but all of the Class B supervoting shares, giving him an "undilutable 33% voting power over the company". [20]
Roomba 805 on its charging dock. Roomba is an automated vacuum cleaning robot first released in 2002. Roomba is powered by a rechargeable battery, and many models are available with a docking station to which the robot returns to recharge at the end of its cleaning cycle. They work in conjunction with accessories that use both IR and RF.
The baud unit denotes symbols per second, or the number of times per second the modem sends a new signal. For example, the ITU-T V.21 standard used audio frequency-shift keying with two possible frequencies, corresponding to two distinct symbols (or one bit per symbol), to carry 300 bits per second using 300 baud.
XMODEM is a simple file transfer protocol developed as a quick hack by Ward Christensen for use in his 1977 MODEM.ASM terminal program. It allowed users to transmit files between their computers when both sides used MODEM.
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