Pirelli Optical Systems
Encyclopedia
Pirelli Optical Systems is a fiber-optic communication
Fiber-optic communication
Fiber-optic communication is a method of transmitting information from one place to another by sending pulses of light through an optical fiber. The light forms an electromagnetic carrier wave that is modulated to carry information...

 company based in the United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. It was acquired by Cisco Systems
Cisco Systems
Cisco Systems, Inc. is an American multinational corporation headquartered in San Jose, California, United States, that designs and sells consumer electronics, networking, voice, and communications technology and services. Cisco has more than 70,000 employees and annual revenue of US$...

on December 20, 1999.
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