Setting Switch Options LIU–1 Through LIU–4
Receive Sensitivity
The equalizer gain logic (EGL) determines how sensitive the receive circuits are to the incoming signals. You set
the level for -26 dB or -36 dB by using DIP switch LIU–1. (Normally, the -26 dB level setting is the better choice.)
Transmit Level Attenuation
You can manually set the transmit level for a particular value (0, -7.5, -15, or -22.5 dB) or select the automatic
feature that sets the transmit level automatically depending on the receive signal. A weak receive signal causes a
strong transmit signal and vice versa. Use DIP switch LIU–2 to select either the manual or the automatic setting.
If you select the manual setting, set the desired value with DIP switches LIU–3 and LIU–4. Normally, 0 dB is
used when connecting to a network interface box.
LIU DIP Switch
Number
Switch Position
Function
1 (top)
0 (default)
1
RECEIVE SIGNAL SENSITIVITY
-26 dB
-36 dB
2
0
1 (default)
TRANSMIT LEVEL MODE
Automatic (level set by receive signal)
Manual (level set by switches 3 and 4 below)
3,4
0,0 (default)
0,1
1,0
1,1
TRANSMIT LEVEL ATTENUATION
(LIU-2 must be “1")
0 dB
-7.5 dB
-15 dB
-22.5 dB
Installing And Programming The DXPRI Card
IMI89–255
Setting The T1/PRI Switches – 7