IDEAL INDUSTRIES FIBERTEK, Руководство пользователя

Страница: 100 / 147

Chapter 6
Fiber Optics Diagnostics (TRACETEK)
Figure 6-1: OTDR Block Diagram
OTDR History
OTDRs were first used in long distance outside plant fiber optic installations such as
telecom or CATV to help document and troubleshoot fiber networks. The first
generation OTDRs were massive, complex and very expensive. Most models required
the use of a cart or dolly of some type to be moved, as they were heavy and bulky.
These early machines did not offer any of the automatic setup features we are used to
seeing today, meaning that the operator had to have a very thorough understanding
of the operation of the equipment to properly configure it.
Today, OTDRs are smaller, less expensive and easier to use. But that still does not
mean that the average installer can pick one up and begin using it. The technician still
needs to understand the complex relationship between pulse width, dynamic range,
acquisition time, Rayleigh scattering, and a myriad of other factors that determine
what type of picture the technician will get from an OTDR.
Figure 6-2: Typical OTDR Trace
6-2
www.vemco.pl