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When the modem wants the computer to temporarily pause so the playback can catch up, it temporarily lowers the CTS (Clear to Send) signal on the RS-232 serial port. The modem re-raises the signal in time for the computer to resume sending audio data before the playback buffer becomes completely empty.
Terminal-emulator software typically allows the user to send Hayes commands directly to the modem, and to see the responses. In this example, the user of computer A makes the modem dial the phone number of modem B at phone number (212) 555-0100 (long distance). After every command and response, there is a carriage return sent to complete the ...
Operated first by Trans-Canada Telephone System, [2] then Telecom Canada, then the Stentor Alliance, it finally reverted to Bell Canada when the Stentor Alliance was dissolved in 1999. [3] Like most X.25 networks in the western world, DATAPAC services were largely replaced by TCP/IP in the 1990s and 2000s. Bell phased out the service on 31 ...
Telenet was an American commercial packet-switched network which went into service in 1975. [ 1 ] [ 2 ] It was the first FCC-licensed public data network in the United States. [ 3 ] Various commercial and government interests paid monthly fees for dedicated lines connecting their computers and local networks to this backbone network .
The modem connects to a single computer or router, through an Ethernet port, USB port, or is installed in a computer PCI slot. The more common DSL router is a standalone device that combines the function of a DSL modem and a router, and can connect multiple computers through multiple Ethernet ports or an integral wireless access point.
Speeds on 2.5G networks are usually in the 30–50 kbit/s range. The first personal computer with a built-in mobile broadband modem was the ITC 286 CAT, a laptop by Intelligence Technology Corporation. Released in 1988, it featured a Hayes-compatible AMPS modem capable of transmitting data at 1.2 kbit/s. [3] [4]
Dial-up Internet access is a form of Internet access that uses the facilities of the public switched telephone network (PSTN) to establish a connection to an Internet service provider (ISP) by dialing a telephone number on a conventional telephone line which could be connected using an RJ-11 connector. [1]
X.25 is an ITU-T standard protocol suite for packet-switched data communication in wide area networks (WAN). It was originally defined by the International Telegraph and Telephone Consultative Committee (CCITT, now ITU-T) in a series of drafts and finalized in a publication known as The Orange Book in 1976.