11-23-1992 10,000,000 Cellular Telephone Sold
|
|
| Audience/Grade: | College Freshman-Continuing Education |
| Discipline(s): |
Design Electrical Engineering Engineering Management General Engineering, Engineering Science Industrial Design Industrial Engineering Information Technology |
| Special Topic(s): | |
| Learning Resource Type: |
Community - Blog |
| Media Type: |
Unknown |
| Author(s): |
Michael Smith |
| Description: | The Engineering Pathway's blog for November 23. Excerpt: "Today in History- November 23, 1992 - Cellular telephone industry sells 10 million cell phones and sets customer mark on way to projected subscriber base of 20 to 27 million by 1997. Cell phone sales passed 1 billion in 2006. The technology of modern cell phones started with the creation of hexagonal cells for mobile phones by D.H. Ring from Bell Labs in 1947, later on another engineer from Bell Labs conceived of cell towers that would transmit and receive signals in three directions instead of normal bi directional antennas. By 1967, mobile phone technology was available; however, the user had to stay within one cell area. In 1970, Amos Edward Joel developed the call handoff system to facilitate continuity of a phone call from one area to another without dropping the phone call. In 1971, AT&T submitted a request to the FCC for cellular service. It took more than 10 years for an approval and in 1982; the FCC allocated the frequencies of 824-894 MHZ Band to Advanced Mobile Phone Service (AMPS). From 1982 to 1990, AMPS was an analog service, Digital AMPS came online as of 1990." |
| Rating: |
|
| Related Resources | |
| Keywords: | cell phone cellular phone telecommunications |
| Is Component of: |
"Today in History" Blog of the Engineering Pathway Digital Library |
| Usage Tip | |
| Related ABET Criteria: |
(c) Design a system, component, or process (h) Understand global, economic, environmental, and societal context |
| Use of Resource: |
History of technology can be used to connect modern technology to its roots. |
| Difficulty: |
Easy |
| Interactivity Level: |
Low |
| Version Info | |
| Publication Date: | November 2008 |
| Platform/Format: |
WWW |
| Cost: |
Free |
| Download URL: | http://www.k-grayengineeringeducation.com/blog/index.php/2009/11/ |
| Metadata: |
IEEE LOM Record |
| Collection: |
NEEDS
|
