SAMBA 75 USER’S GUIDE
VERSION 1.01
4.2 Functional description
The SAMBA 75 GSM/GPRS and EDGE modem is a mobile station for transmission of
data (including digital images, web pages and photographs) and fax calls as well as
SMS in GSM networks.
The SAMBA 75 modem consists of the following components:
•
GSM/GPRS transceiver
•
USB 2.0 for power supply, data transmission and control.
•
GPRS Class B, class 12.
•
EDGE Class B, class 10.
The SAMBA 75 allows control of the GSM/GPRS modem over the interface A.
If the GSM/GPRS modem SAMBA 75 is registered in the network, it acts just like a
regular fax/data modem. To control the GSM or GSM/GPRS Modem there is an
advanced set of AT-commands according to GSM ETSI 07.07 and 07.05
implemented.
Three LED’s on the interface B of the Modem display the actual state of the SAMBA.
The table below shows the functions of these LED’s.
LED’s
Name
LED mode
Function
Off
Modem is off or run in SLEEP mode
600 ms On / 600 ms Off
No SIM card inserted or no PIN entered, or network search in progress,
or ongoing user authentication, or network login in progress.
75 ms On / 3 s Off
Logged to network (monitoring control channels and user interactions).
No call in progress.
75 ms On / 75 ms Off/
75 ms On / 3 ms Off
One or more GPRS contexts activated.
Flashing
Flashing Indicates GPRS data transfer: When a GPRS transfer is in
progress, the LED goes on within 1 second after data packets were
exchanged.
Flash duration is approximately 0.5 s.
GSM (LED)
On
On Depending on type of call:
Data call:
Connected to remote party or exchange of parameters while
setting up or disconnecting a call.
200 ms On / 200 ms Off
USB
100 ms On / 3.2 s Off
No SIM card inserted, Modem On, USB On.
Off
Modem and USB are OK
ERR (LED)
Continually On
USB device initialization or USB device error.
DATA (LED)
flashes
Indicates incoming/outgoing Modem Data Traffic
Table 8:
Modes of the LED’s and associated functions
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