2408LT Standalone L-Band Fiber Optic Transmitter
Revision
1.5
Page -
7
4.
STATUS INDICATORS
The 2408LT module has three LED status indicators on the front of the box to show operational status of
the module at a glance.
4.1.
RF DRIVE INDICATOR
HIGH:
The RF DRIVE LED will be RED when the incoming RF signal plus the module gain is
overdriving the laser. Over driving the laser will be manifested as IMD at the receiver.
OK:
The RF DRIVE LED will be GREEN when the incoming RF signal plus the module gain
is within the normal drive levels for the laser.
LOW:
In manual gain mode, the RF DRIVE LED will be ORANGE when the incoming RF
signal plus the module gain is under driving the laser, leading to non-optimal signal to
noise ratio. In AGC mode, this LED will be ORANGE when the incoming signal drops
below the AGC hold range.
Table 4-1 provides a guide for the RF power levels that trip the LED indicators in each gain mode. Trip
points are as per the power measured by the 2408LT, which is relayed via SmartMON
TM
data to the paired
receiver. This level may be displayed on the card edge of the paired receiver or through VistaLINK
®.
Nominal Input Level
( dBm )
Setting Gain ( dB )
LOW Trip (dBm)
HIGH Trip (dBm)
-10 to –40dBm
0 AGC
-40
-5
-14
1 +2
-19
-8
-16
2 +4
-21
-10
-18
3 +6
-23
-12
-20
4 +8
-25
-14
-22
5 +10
-27
-16
-24
6 +12
-29
-18
-26
7 +14
-31
-20
-28
8 +16
-33
-22
-30
9 +18
-35
-24
-32
A +20
-37
-26
-34
B +22
-39
-28
-36
C +24
-41
-30
-38
D +26
-43
-32
-40
E +28
-45
-34
-42
F +30
-47
-36
Table 4-1: LED Trip Points for RF DRIVE LED for Each Gain Setting
