User Manual DEV 7xxx Optribution® Modules
Copyright DEV Systemtechnik GmbH 2012-2017
9
the transmitting laser diode is generating not enough light;
a broken fiber is preventing proper optical transmission;
the attenuation of the fiber is too high.
Note that the "
Opt.
" LED of the DEV 7344 monitors both detector diodes, i.e. it turns
to red if one of the detector diodes is not receiving enough light (logical OR).
With the integrated RF level monitoring functionality of the optical receiver
modules the aggregated power level of the RF signal after the optical/electrical
conversion is measured and compared with an adjustable threshold. If the RF signal
is below the threshold level, an event is generated. The status is indicated via the
"
RF
" LED(s) [(
3
): green means ok, red indicates the signal level to be below the RF
threshold level] and additionally via Web Interface and via SNMP, given that the
applied Optribution® chassis provides these features.
The optical receiver modules DEV 7332, DEV 7333, and DEV 7338 have a built-in
gain control feature with a gain up ("
↑
") push button (
4
) and a gain down ("
↓
")
push button (
5
) to adjust the RF output level of the module. Alternatively (or
exclusively for the DEV 7344), the gain can be adjusted in Local Mode via Web
Interface and in Remote Mode via SNMP, given that the applied Optribution®
chassis provides these features.
Note:
For the Optribution® chassis providing a Web Interface the gain buttons on the
optical receiver modules DEV 7332, DEV 7333, and DEV 7338 can be operated
in Local Mode, only.
The optical receiver modules DEV 7333, DEV 7337, and DEV 7338 additionally
provide an integrated slope (or tilt) control feature.
A potentiometer (
7
) for the slope adjustment is located at the front side of the
DEV 7337. The slope of the optical receiver modules DEV 7333 and DEV 7338
can be adjusted via Web Interface or via SNMP for Optribution® chassis
providing these features.
Finally, an RF monitoring port (
6
, labelled "
Mon
") is available at the optical receiver
modules DEV 7332, DEV 7333, DEV 7337, and DEV 7338.
Note:
For selected optical receiver modules applied in an Optribution® chassis
providing a Web Interface and/or SNMP: All LEDs of the module may blink
shortly as a receipt after the boot phase and after an operation mode change.