[WEBINAR] The New Normal: Dealing with the Reality of an Unsecure World

Answer-Only Modem

Definition - What does Answer-Only Modem mean?

An answer-only modem is a network device that is capable of receiving messages, but cannot send messages. Answer-only modems were usually the most inexpensive modems available.

Techopedia explains Answer-Only Modem

Answer-only modems were first manufactured by Bell Systems around 1962. They used frequency-shift keying (an early frequency modulation scheme) and received messages at a rate of 2,025 Hz. AT&T later came out with both an originate-only modem, model 113D, and an answer-only modem, model 113B/C. In 1977, Vadic came out with the VA3467 triple modem, an answer-only modem; it was sold to computer center operators and had a 1,200-bps mode.

In 1981, Hayes introduced its Smartmodem and later produced an answer-only modem model, which operated on the server side but was much more expensive than the acoustically coupled models (picked up audio signals from a telephone handset) that operated on the client side. However, this answer-only modem was a low-cost, server-side modem that helped make the bulletin board systems (BBSs) flourish.

Techopedia Deals

Connect with us

Techopedia on Linkedin
Techopedia on Linkedin
"Techopedia" on Twitter

Sign up for Techopedia's Free Newsletter!

Email Newsletter

Join thousands of others with our weekly newsletter

Free Whitepaper: The Path to Hybrid Cloud
Free Whitepaper: The Path to Hybrid Cloud:
The Path to Hybrid Cloud: Intelligent Bursting To Amazon Web Services & Microsoft Azure
Free E-Book: Public Cloud Guide
Free E-Book: Public Cloud Guide:
This white paper is for leaders of Operations, Engineering, or Infrastructure teams who are creating or executing an IT roadmap.
Free Tool: Virtual Health Monitor
Free Tool: Virtual Health Monitor:
Virtual Health Monitor is a free virtualization monitoring and reporting tool for VMware, Hyper-V, RHEV, and XenServer environments.
Free 30 Day Trial – Turbonomic
Free 30 Day Trial – Turbonomic:
Turbonomic delivers an autonomic platform where virtual and cloud environments self-manage in real-time to assure application performance.