Nevion D422-MG - Manual (Page 16)

D422-MG Rev. H
nevion.com | 16
5 Operational status monitoring
The status of the module can be monitored in two ways.
GYDA system controller module.
LED’s at the front of the sub-rack.
The LED’s are mounted on the module itself, whereas the GYDA-SC controller is a separate
flashlink module which presents the status of the flashlink modules in the frame(s) as a web
site.
The functions of the two monitoring systems are described below.
5.1 GYDA
– Monitoring and control
From within GYDA it is possible to have alarms on loss of signal, loss of reclocker lock,
voltages, laser failure etc. As of firmware version 2.0.0 of D-422-MG it is also possible to
have alarms on each of the 16 GPI inputs, as well as the 16 GPI outputs. Only the GPI inputs
have alarms attached to them by default. Also, the same firmware version enables control of
the GPI outputs, so each output can follow remote input, drive active low or set high
impedance. All these functions are available from both web and SNMP. This means that
spare GPI inputs and outputs on D-422-MG can be used to extend GYDA with more inputs
and outputs.
5.2 Front Panel - Status Monitoring
The status of the module can be easily monitored visually by the LED’s at the front of the
module. The LED’s are visible through the front panel as shown in the figure below.
Figure 9: LED overview of D-422-MG
(Text not printed on the front panel).The D-422- MG has 3 LED’s. The colours of each of the
LED’s have different meanings as shown in the table below.
Diode \ state Red LED Green LED No light
Status 
Module initialising (takes
app 1 sec).

The laser is turned off.

Module is faulty (fuse
blown etc).
Module self-test is OK
and power is present. Module has no power.
Loss of signal No optical input signal,
check fibre connection and
card in opposite end. Optical input signal
present.
Laser fail Laser is malfunctioning. Laser is ok.