Labels:text | screenshot | diagram | line | font OCR: How They Work TRANSPORT MECHANISMS Modems Analog signal over traditional telephone networks; circuit- switched (a connection Speed: 28.8 Kbps is established between Time to send 1-MB file: 347.2 seconds (5.7 minutes) two sites for the duration of the transmission). 64-Kbps ISDN (BRI) channels Digital signal over phone network; circuit-switched. Speed: 128 Kbps (two 64-Kbps channels] Time to send 1-MB file: 62.5 seconds Digital signal over packet-switched net- ATM work. Sender breaks data up into 53-byte cells. Each cell finds fastest route to the ...... receiver. The receiver Speed: scalable from 50-622 Mbps reassembles the Time to send 1-MB file: 0.5 seconds (at 155 Mbps) data into its original form.
