SAMBA 55/56
VERSION 1.03
3.2 Functional
description
The GSM/GPRS modem SAMBA is a mobile station for transmission of
voice, data and fax calls as well as SMS in GSM networks.
The GSM/GPRS modem SAMBA consists of the following components:
•
GSM/GPRS transceiver
•
USB 1.1 for power supply, data transmission and control.
•
GPRS Class B, class 10.
The GSM/GPRS modem SAMBA allows control of the GSM/GPRS
modem over the interface A.
If the GSM/GPRS modem SAMBA 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.
The actual state of the SAMBA is displayed by three LED’s on the interface
D of the Modem.
The table below shows the function 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:
Voice call:
Connected to remote party.
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 7:
Modes of the LED’s and associated functions
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