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The original RJ45S [a] was intended for high-speed modems and is obsolete. The RJ45S jack mates with a keyed 8P2C modular plug, [18] [19] and has pins 4 and 5 (the middle positions) wired for the ring and tip conductors of a single telephone line and pins 7 and 8 shorting a programming resistor. This is a different mechanical interface and ...
A cable modem termination system (CMTS, also called a CMTS Edge Router) [1] is a piece of equipment, typically located in a cable company's headend or hubsite, which is used to provide data services, such as cable Internet or Voice over IP, to cable subscribers.
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 ...
At the end of the 20th century, four-wire circuits saw renewed growth for corporate local loop service for use in dedicated line service for computer modems to interconnect company computer networks and to connect networks to an Internet service provider for Internet connectivity before commodity DSL and cable modem connectivity was widely ...
Some voice modems offer a very large transmit buffer (for example, 4 seconds' worth of audio) coupled with a bug that prevents the host from requesting an "abort playback". The result is that if a caller presses a touch-tone that's supposed to interrupt a message, and the host is providing unlimited audio data mediated by CTS alone, the end ...
Crossover cable connecting two MDI ports. Certain equipment or installations, including those in which phone and/or power are mixed with data in the same cable, may require that the non-data pairs 1 and 4 (pins 4, 5, 7 and 8) remain un-crossed. This is the most common kind of crossover cable.
This use of G.711 coding is sometimes called 'fax pass-through' as it enables analog fax transmission (which also uses a modem connection) over VoIP. [2] G.711 modem-over-VoIP communication can be useful for connecting an Internet-connected computer to a dial-up system that only has modem connectivity over the PSTN.
DSL modems use frequencies from 25 kHz to above 1 MHz (see Asymmetric Digital Subscriber Line), in order not to interfere with voice service which is primarily 0–4 kHz. Voice-band modems use the same frequency spectrum as ordinary telephones, and will interfere with voice service - it is usually impossible to make a telephone call on a line ...