TANGO55/i & TANGO56/i User's Manual
Version 1.05
4.1.6 Interface F (Optical indicator interface)
The actual state of the TANGO55/i and TANGO56/i is displayed by two LED’s on
interface F of the unit (for more details see chapter
4.2
Functional description).
Figure 7:
Status indicator of modem
4.2 Functional description
The GSM/GPRS modem TANGO55/i and TANGO56/i are mobile stations for the
transmission of voice, data and fax calls as well as SMS in GSM/GPRS networks.
The GSM/GPRS modems TANGO55/i and TANGO56/i consist of the following
components:
•
GSM/GPRS transceiver
•
Power supply unit
•
Serial link (V.24) for data transmission and control
•
GPRS Class B, Class 2 or Class 10
.
If the GSM/GPRS modem is registered in the network, it acts just like a regular
fax/data modem. To control the GSM modem there is an advanced set of AT-
commands according to GSM ETSI 07.07 and 07.05 implemented. The two LED’s on
the top of Interface C are showing the state of TANGO55/i and TANGO56/i. The
yellow LED signals the actual connection of the modem (interface B or C) and the
green LED signals power connection, GSM/GPRS network, a “RESET” function and
“SOFT-ON ” procedure.
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