Hazardous Mataterial - Recognizing and Identifying the Hazards No. 2 Questions taken from Jones & Bartlett Fundamentals of Fire Fighter Skills (3rd Edition) Progress Indicator: Question 3 of 20 3.  An optical media interface is located on the bottom of the instrument and is used for infrared data transmissions at speeds of _________ bytes/second. Choices: 100,000 105,000 115,000 None of the above