Bubble Jet Ink cartridge contains ink, printhead and special piezoelectric crystal. When signal is send to the crystal, it expands, forcing the ink out. Do not refill bubble jet printer cartridges. They need to be replaced. Modems Modems use asynchronous transmission.
Digital modems use synchronous transmission.
Digital modems are used to connect to ISDN lines. ATA Answer ATD Dial ATH Hang up ATZ Reset Basic network terminology LAN Local area network. Typical network inside an office or inside a building MAN Metropolitan area network. A network that connects several LANs in a city. WAN Wide area network.