Greenlee 560XL Bedienungsanleitung Seite 25

560XL • 567XL • 568XL • 570XL • 573XL • 577XL • 578XL • 580XL
Two Test Jumper Method: Link Loss (cont'd)
The following procedure conforms to FOTP-171 (Method B), OFSTP-7
(Method A), and OFSTP-14 (Method A).
1. If a complete test set (light source and optical power meter) is available
at each end, it is advisable to test the output power of the sources and
the condition of the test jumpers before commencing measurement of
the link.
Connect each source and optical power meter with a test jumper, as
shown above. The sources should be set to continuous wave (CW)
output mode. The power meters should be set to the correct wavelength
and to dBm measurement units. Note the P1 and P2 dBm readings. For
example, a 580XL 1310 nm laser source should read between -6.5 and
-7.5 dBm on the optical power meter.
A
Test
jumper 1
Source
2. Connect a light source and optical power meter to the respective patch
panel ports using the test jumpers, as shown above.
FORWARD LOSS (dB) = P1 – P3
Cable
plant
Test
jumper 2
P3
Power meter
B
25