SS-15 BRI (ISDN 2 GSM) USER MANUAL
DOC. NO: SS-15-14 (REV. 01)
Page 13 of 26
4.8
LED INDICATORS
The SS-15 BRI (ISDN 2 GSM) equipment
has three LED’s as optical status
indicators, shown in the figure to the right.
Figure 7: Location of the LED status
indicators: form top downwards the GSM
LED, the ISND LED and the power supply
LED.
The first two are bi-colour (red / green)
while the Power led lights only green.
Functions of LED`s status
Each LED may light green or red, continuously or blinking with different
frequencies, as shown in the table below:
LED
STATUS
SIGNIFICANCE
This dual colour LED shows the status of GSM modules. It
lights green to indicate GSM 0 and red to indicate GSM 1.
Topmost
(GSM)
Blinking fast,
5 Hz
The GSM module is initializing
Blinking,
1 Hz
Wrong PIN number (PIN error)
Blinking slow,
0.5 Hz
GSM module is searching for the
network (antenna not installed, or
SS-15 not in the coverage area of
the GSM network )
Off
GSM module has registered to the
network and is in standby
On,
continuously
GSM module is busy (in a call or
just allocated)
Middle
(ISDN)
Information about synchronization of ISDN interfaces. Here
green color indicates the NT interface and red color refers to
the TE interface of SS-15.
Blinking 0.25 sec then
one sec off
Interface not synchronized. For
example, if green LED lights 0,25
sec then red LED lights 0,25 sec it
means both interfaces are not
synchronized.
Off
The ISDN interface is
synchronized
Lower
(Power)
Lights continuously green The supply voltage is present
Off
There is no-supply voltage