Propagation Delay
January 21st, 2009
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Light travels through a vacuum at a speed of 186,000 miles per second and electrons travel through copper or fiber at approximately 125,000 miles per second. Â A fiber network stretching halfway around the world (13,000 miles) induces a one-way delay of about 70 ms. Â Although this delay is almost imperceptible to the human ear, propagation delays in conjunction with handling delays can cause noticeable speech degradation.
Source: Â Voice over IP Fundamentals (Second Edition) – Cisco Press
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