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Что (кто) такое null modem - определение

SERIAL CABLE CONNECTING TWO COMPUTERS

Null modem cable; Null-modem; NULL modem; Null-modem cable; Nullmodem

null modem

<communications, hardware> A cable, especially an EIA-232 cable, for connecting serial ports on two computers directly, rather than via modems. Since, according to the specification, both computers should transmit on pin three of their EIA-232 connectors and receive on pin two, a null modem cable needs to connect one computer's pin two to the other's pin three and vice versa. It also needs to have male connectors at both ends (again, according to the specification). (1996-05-17)

Null modem

Null modem is a communication method to directly connect two DTEs (computer, terminal, printer, etc.) using an RS-232 serial cable.

https://en.wikipedia.org/wiki/Null_modem

K56flex

DEVICE THAT MODULATES AN ANALOG CARRIER SIGNAL TO ENCODE DIGITAL INFORMATION

K56flex; K56Plus; Computer modem; X2 (protocol); Telephone modem; 56 kbit/s modem; Modems; MODEM; 56K; 56k; 56 Kbps modem; 56,000 bps modem; V.Flex2; K56Flex; K56plus; X2 (Chipset); Analog modem; 56K modem; Mdoem; External modem; Intelligent modem; Limited Distance Modem; Mobile USB modem; Dial-up modem; 56k modem; 56k Modem; Gsm modem; 3G dongle; Portable modem; Volksmodem; Voiceband modem; Usb modem; 56kbit modem; 🖀; Phone Modem; Optical modem; 300 baud; Draft:Modem; Automatic calling unit; Automatic calling units; 33.6k modem

<protocol> A modem standard developed by Rockwell for 56 kbps communications. K56flex Became more popular than the rival X2 but will be superseded by the official V.90 standard. [Already superseded?] (1998-09-08)

Википедия

Null modem

Null modem is a communication method to directly connect two DTEs (computer, terminal, printer, etc.) using an RS-232 serial cable. The name stems from the historical use of RS-232 cables to connect two teleprinter devices or two modems in order to communicate with one another; null modem communication refers to using a crossed-over RS-232 cable to connect the teleprinters directly to one another without the modems. It is also used to serially connect a computer to a printer, since both are DTE, and is known as a Printer Cable.

The RS-232 standard is asymmetric as to the definitions of the two ends of the communications link, assuming that one end is a DTE and the other is a DCE, e.g. a modem. With a null modem connection the transmit and receive lines are crosslinked. Depending on the purpose, sometimes also one or more handshake lines are crosslinked. Several wiring layouts are in use because the null modem connection is not covered by the RS-232 standard.

https://en.wikipedia.org/wiki/Null modem