User's Manual

MA 2000 Installation and Configuration Guide
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7.1 General
Two parameters are of prime importance when testing optical cables or jumpers for use with
Mobile Access products:
• Optical Loss – the difference between the optical power at the input and
output of an optical cable. It must be measured (usually in dB units) at
1310 nm. The maximum allowable loss should be < 0.5 dB/km for Single
Mode (SM) cables and < 0.5 dB for every mated pair of connectors.
• Optical Backreflection – the percentage of light backreflected from the
fiber input (dB units). The maximum allowable backreflection should be < –
55 dB for all jumper cables.
The methods to test these parameters will be described below.
7.2 Optical Loss Testing
This section describes the optical loss testing of a Single Mode Cable with SC/APC connectors
at each end.
7.2.1 Required Test Equipment
• 1310 nm Stabilized Laser Source
• 1310 nm Optical Power Meter