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In network topology, a cable modem is a network bridge that conforms to IEEE 802.1D for Ethernet networking (with some modifications). The cable modem bridges Ethernet frames between a customer LAN and the coax network. Technically, it is a modem because it must modulate data to transmit it over the cable network, and it must demodulate data ...
Canopy – A line-of-sight wireless technology, primarily used by ISPs to provide broadband internet; MotoMESH – A mobile wireless broadband product providing proprietary "Mesh-Enabled Architecture" and standards-based 802.11 network access in both the unlicensed 2.4 GHz band and the licensed 4.9 GHz public-safety band
V.91: A digital modem operating at data signalling rates of up to 64 000 bit/s for use on a 4-wire circuit switched connection and on leased point-to-point 4-wire digital circuits, published in 1999 V.92 is an ITU-T recommendation, titled Enhancements to Recommendation V.90 , that establishes a modem standard allowing 56 kbit/s download, 48 ...
The early models of the modems also offered a hidden interface providing a 4-wire serial communication interface for debugging or monitoring purposes. Via a special connector a systems-engineer could connect this interface to the serial communications ( RS-232 ) port of a PC to monitor the activity of a cable modem.
Zoom Telephonics was founded in 1977 as a home networking product manufacturer, headquartered in Boston, Massachusetts. [3] The company was founded by Frank B. Manning and Bruce Kramer, two fellow roommates and graduates of the Massachusetts Institute of Technology (MIT) who had known each other since the late 1960s.
T1 and R1: the ground and battery of the transmitter voice pair; 4-wire E&M uses a 4-wire (2-pair) transmission path for the voice signal. 2-wire E&M uses a single pair for both transmit and receive voice signal. This is much inferior to 4-wire E&M as the 2-wire interface uses hybrid transformers which reduce signal quality and can introduce echo.