EXFO LFD-200 Live Fiber Detector - Manual (Page 13)

LFD-200 8
5. If you want to send a modulated signal, connect the unit to a source (such as
EXFO FOT-700 Fiber-Optic Tester, FLS-130A Fiber-Optic Light Source or
FLS-210A Variable Light Source), as illustrated below.
Note: The recommended wavelength is 1550 nm for tone identification. If you
use another wavelength than 1310 nm or 1550 nm, the Live Fiber
Detector will still detect the signal, but the specifications are not
guaranteed.
6. Evaluate the presence and direction of light transmission.

If the traffic LED indicator located on the left-hand side is illuminated, the
traffic is coming from the right.

If the traffic LED indicator located on the right-hand side is illuminated, the
traffic is coming from the left.
A beep also indicates the presence of traffic.
7. Identify the tone.
If you have connected a source to send a modulated signal, one of the 270 Hz,
1 Hz, or 2 kHz tone LED indicator will be illuminated.
Note: During the operation at the lowest levels of tone detection
(approximately –40 dB core power), the tone LEDs may flicker, which
indicates that the minimum range of detection was reached.
Fiber under test
FOT-700 Fiber-Optic Tester LFD-200 Live Fiber Detector
FIBER-OPTIC TESTER FOT-700
ZERO
START
ON/OFF
MODE dB/dB/W

CW
DELETE STORE
REF AUTO
270 1k 2k
Live Fiber Detector
LFD-200
LOW BAT
RIB-CBL
TRAFFIC