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ZMODEM is an inline file transfer protocol developed by Chuck Forsberg in 1986, in a project funded by Telenet in order to improve file transfers on their X.25 network. In addition to dramatically improved performance compared to older protocols, ZMODEM offered restartable transfers, auto-start by the sender, an expanded 32-bit CRC, and control character quoting supporting 8-bit clean ...
Because voice mode is not the typical use for a modem, many modems on the market have poor or buggy support for their voice modes. Characteristics of a good voice modem depend greatly upon the intended application, and include: Reliable operation. Many modems simply "lock up" or crash the host PC, though this is more common with Winmodems ...
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.
The initial network had SL-10 nodes in Calgary, Toronto, Ottawa and Montreal, linked together using Dataroute's existing 56k microwave links. A network operations center was set up in Ottawa, linked into the network on 9600 bps links directly to the Ottawa and Toronto nodes. [ 6 ]
This command returns information about the model, such as its firmware or brand name. Each number (0 to 9, and sometimes 10 and above) returns one line of modem-specific information, or the word ERROR if the line is not defined. Today, Windows uses this for Plug-and-play detection of specific modem types. L0 or Ln (n=1 to 3) Speaker Loudness.
The original founding company, Telenet Inc., was established by BBN. In January 1975, Telenet Communications Corporation announced that they had acquired the necessary venture capital after a two-year quest. Initially, Bob Kahn was the first President of Telenet; He then moved to ARPA as Larry Roberts left to become President of the company. [4]
Telnet (short for "telecommunications network") [1] is a client/server application protocol that provides access to virtual terminals of remote systems on local area networks or the Internet. [2]
The 201A Data-Phone was a synchronous modem using two-bit-per-symbol phase-shift keying (PSK) encoding, achieving 2,000 bit/s half-duplex over normal phone lines. [10] In this system the two tones for any one side of the connection are sent at similar frequencies as in the 300 bit/s systems, but slightly out of phase.