What happened to Hayes modems?
Hayes was a major brand in the modem market from the introduction of the original 300 bit/s Smartmodem in 1981. The widespread introduction of ADSL and cable modems in the mid-1990s repeatedly drove the company in Chapter 11 protection before being liquidated in 1999.
What is a Hayes compatible modem?
A Hayes-compatible modem is a modem that recognizes and adheres to the Hayes AT command set, a command language with strings that combine together to output complete commands for different operations.
What is a 2400 baud modem?
The baud rate is a measure of how many times per second a signal (for instance that sent by a modem) changes. For example, a baud rate of 1200 implies one signal change every 833 microseconds. Common modem baud rates are 50, 75, 110, 300, 600, 1200, and 2400. Most high speed modems run at 2400 baud.
What are the causes of modem failure?
Causes of Modem Not Connecting to Internet Loose power or coax connections. Damaged Ethernet cable connections. Miscommunication with the router. Overheating.
What does Dennis C Hayes invention do?
Computer-related contributions Invented the PC modem. Founder of Hayes Microcomputer Products, a company that makes modems. Known for creating the Hayes AT command set, used in most modems produced to this day.
What is Hayes style commands?
The Hayes command set includes commands for various phone-line operations such as dialing and hanging-up. It also includes various controls to set up the modem, including a set of register commands which allowed the user to directly set the various memory locations in the original Hayes modem.
How many bps can the modem achieve at 1200 baud?
9600 bps
9600 bps = 1200 baud * 8 bits per baud .
When did the 1200 baud modem come out?
1976
Evolution of dial-up speeds
| Connection | Modulation | Year released |
|---|---|---|
| 1200 bit/s (1200 baud) (Bell 202) | FSK | 1976 |
| 1200 bit/s (600 baud) (Bell 212A or V.22) | QPSK | 1980 |
| 2000 bit/s (1000 baud) (Bell 201A) | PSK | 1962 |
| 2400 bit/s (600 baud) (V.22bis) | QAM | 1984 |
Do dial-up modems still work?
Yes, you can still use dial-up internet if you have a telephone line, a required modem, and access to an internet provider with dial-up service. However, as more online tasks, like video streaming and web browsing, become more intensive, a high-speed internet connection, if available, might be one to consider.
What speed was dial-up internet?
56 kbit/s
Modern dial-up modems typically have a maximum theoretical transfer speed of 56 kbit/s (using the V. 90 or V. 92 protocol), although in most cases, 40–50 kbit/s is the norm. Factors such as phone line noise as well as the quality of the modem itself play a large part in determining connection speeds.
What is the Hayes command set for modems?
Today almost all modems use a variant of the Hayes command set . Hayes was a major brand in the modem market from the introduction of the original 300 bit/s Smartmodem in 1981. They remained a major vendor throughout the 1980s, periodically introducing models with higher throughput.
What does the cmx469a modem include?
The modem includes circuitry for Carrier Detect and Rx Clock recovery, both of which are made available as output pins. Rx, Tx and Carrier Detect paths contain a bandpass filter to ensure the provision of optimum signal conditions. The CMX469A demonstrates a high sensitivity and good bit-error-rate under adverse signal conditions.
When was the first Hayes bus machine made?
Hayes started producing similar products at a “hobby level” in his kitchen in April 1977 with his friend and co-worker, Dale Heatherington. Their first product was the 80-103A, a 300 bit/s Bell 103-compatible design for S-100 bus machines.