The Info List - Carterfone

The Carterfone
is a device invented by Thomas Carter. It manually connects a two-way radio system to the telephone system, allowing someone on the radio to talk to someone on the phone. This makes it a direct predecessor to today's autopatch.


1 Description 2 Landmark regulatory decision 3 See also 4 References 5 External links

Description[edit] The device was acoustically, but not electrically, connected to the public switched telephone network.[1] It was electrically connected to the base station of the mobile radio system, and got its power from the base station.[1]:659 All electrical parts were encased in bakelite, an early plastic. When someone on a two-way radio wished to speak to someone on phone, or "landline" (e.g., "Central dispatch, patch me through to McGarrett"), the station operator at the base would dial the telephone number. When callers on the radio and on the telephone were both in contact with the base station operator, the handset of the operator's telephone was placed on a cradle built into the Carterfone
device. A voice-operated switch in the Carterfone
automatically switched on the radio transmitter when the telephone caller was speaking; when he stopped speaking, the radio returned to a receiving condition. A separate speaker was attached to the Carterfone
to allow the base station operator to monitor the conversation, adjust the voice volume, and hang up his telephone when the conversation had ended.[2] Landmark regulatory decision[edit] This particular device was involved in a landmark United States regulatory decision related to telecommunications. Previously in 1956, the FCC ruled in the Hush-A-Phone case that devices could mechanically connect to the telephone system without the permission of AT&T. In 1968, the Federal Communications Commission
Federal Communications Commission
allowed the Carterfone
and other devices to be connected directly to the AT&T network, as long as they did not cause harm to the system. This ruling, commonly called "the Carterfone
decision" (13 F.C.C.2d 420), created the possibility of selling devices that could connect to the phone system using a protective coupler and opened the market to customer-premises equipment. The decision is often referred to as "any lawful device", allowing later innovations like answering machines, fax machines, and modems (which initially used the same type of manual acoustic coupler as the Carterfone) to proliferate. In February 2007, a petition for rulemaking was filed with the FCC by Skype, requesting the FCC to apply the Carterfone
regulations to the wireless industry—which would mean that OEMs, portals and others will be able to offer wireless devices and services without the cellular operators needing to approve the handsets. However, on 1 April 2008, FCC chairman Kevin Martin indicated that he would oppose Skype's request.[3] On April 17, 2015 this petition for rulemaking was dismissed without prejudice by the FCC at the request of Skype's current owner, Microsoft Corporation.[4] See also[edit]

Autopatch Acoustic coupler Hush-a-Phone v. United States Interconnection Modem Cordless telephone Terminal equipment Telephone Radio Citizens band radio


^ a b Johnson, Nicholas (2008). "Carterfone: My Story". digitalcommons.law.scu.edu. Santa Clara University
Santa Clara University
School of Law. Retrieved 2015-02-03.  ^ "In the Matter of USE OF THE CARTERFONE DEVICE IN MESSAGE TOLL TELEPHONE SERVICE; In the Matter of THOMAS F. CARTER AND CARTER ELECTRONICS CORP., DALLAS, TEX. (COMPLAINANTS), v. AMERICAN TELEPHONE AND TELEGRAPH CO., ASSOCIATED BELL SYSTEM COMPANIES, SOUTHWESTERN BELL TELEPHONE CO., AND GENERAL TELEPHONE CO. OF THE SOUTHWEST (DEFENDANTS)". Federal Communications Commission. 2008. Archived from the original on 2015-01-20. Retrieved 2015-02-03.  ^ McCullagh D (2008-11-07) Democratic win could herald wireless Net neutrality. CNET, viewed 2010-06-01. ^ FCC order

External links[edit]

Full text of FCC Carterfone
decision Full text of Skype
petition Cybertelecom :: Customer Premises Equipment - FCC Regulations concerning attachment and marketing of CPE Timeline from NPR ArsTechnica: Any lawful device - 40 years after the Carterfone decision (includes picture of the Carterfone) Carterfone: My Story, by Nicholas Johnson, FCC Commissio