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The Bell 103 modem or Bell 103 dataset was the second commercial modem for computers, released by AT&T Corporation in 1963. [ 1 ] [ 2 ] It allowed digital data to be transmitted over regular unconditioned telephone lines at a speed of 300 bits per second .
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A lot of people bought the modem board and made a custom casing. The device supports all the Timex Sinclair machines, [10] coming with a cassette containing modem control software for T/S 1000 and T/S 1500 on side A and for T/S 2068 on side B. [11] It was based on the Intel 8251 USART chip and very slow (300 bit/s).
Hayes Microcomputer Products was a US-based manufacturer of modems.The company is known for the Smartmodem, which introduced a control language for operating the functions of the modem via the serial interface, in contrast to manual operation with front-panel switches.
The modems connect, and both modems report "connect". (In practice, most modems report more information after the word CONNECT — specifying the speed of the connection.) Also, at this time, both modems will raise the DCD, or Data Carrier Detect signal, on the serial port. abcdef: abcdef
Novation's first CAT was an external 300 bit/s Bell 103-standard modem that connected to the phone lines using an acoustic coupler.Like most other acoustically coupled modems, the CAT required the user to dial the desired number on a normal telephone, listening to the call connecting and the eventual presence of an answer tone.
A DSL modem, which is type of customer-premises equipment. The WAN interface of this device, in this case the DSL port, could expose CWMP to the internet service provider . Technical Report 069 ( TR-069 ) is a document by the Broadband Forum that specifies the CPE WAN Management Protocol ( CWMP ).