Allied Telesis AT-LX3800U - Manual (Page 59)

AT-LX3800U Multi-Service Transport System Installation and Maintenance Guide
59
Note
A pass-through optical power monitor is required because when the
fiber optic cable is removed from the RX or TX port, the Open Fiber
Control algorithm is activated. This results in a significant reduction
in optical power compared to the closed loop actual optical power
value.
If the received optical power is greater than -7 dBm per channel,
additional attenuation is required. RX values greater than -7 dBm per
channel could potentially damage the optical receiver if applied for
more than 60 seconds.
Note
When you add attenuation to the system, ensure that the attenuated
value does not drop below the receiver’s sensitivity values. Refer to
“Optical Specifications” on page 76 for more information.
3. Remove the pass-through optical power monitor from the RX port.
4. Connect the appropriate fiber optic cable to the TX and RX line ports,
as shown in Figure 34.
Figure 34. Connecting the TX and RX Cables
TX
CLASS 1 LASER PRODUCT
10/100Base-TX
RS-232
TERMINAL
FT
CO
PA
PB
8
RESET
AT-LX3800U
8
LINE
C
LINE
AT-LX3811/8
SFP
SYNC
TX
RX
LINE
RDY
TX
RX
TRIB RX
100 10
148