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Scheda
UMTS PC EXPRESS Card Merlin X950 : utilizzabile
con tutti i gestori UMTS -
Scheda
UMTS Merlin X950 pc Express / 34 - 54 -
SUPPORTO
LINUX Requisiti
minimi
Di seguito sono descritte leprocedure da seguire per l'utilizzo
della X950 con Linux. Il requisito minimo è la presenza
di un sistema operativo con Kernel 2.6 o superiore. Non è
necessario richeidere l'invio di drivers di alcun tipo.
- Novatel Wireless Merlin X950 ExpressCard™ modem
- Linux Kernel 2.6 o successivo
- SIM card attiva per UMTS/EDGE/GPRS
- pppd pre-installato (è pre-installato se usi Linux
Kernel 2.6 o successivo)
Limitazioni
Non puoi monitorare lo stato della card, ad esempio la forza del
segnale di campo, i bytes scambiati, o lo stato della connessione.
L'unica indicazione sulla rete utilizzata è fornita dal
LED di cui è dotata la X950, che indica la presenza ed
il tipo di segnale. Non è disponibile alcun interfaccia
grafico tramite un sw tipo Mobilink (XP, VISTA). Tutte le operazioni
devono essere eseguite tramite i comandi tipici di Linux.
SETUP Open an
xterm window (window A) and log in as root:
su root
tail –f /var/log/messages
Insert the X950 ExpressCard™ modem into your notebook computer.
Look for the port association and note the lower order port numbers
when device is inserted. The information will be used later in
this procedure. The following shows sample output:
Aug 3 15:27:33 linux kernel: usb 5-1: configuration #1 chosen from
1 choice
Aug 3 15:27:33 linux kernel: airprime 5-1:1.0: airprime converter
detected
Aug 3 15:27:33 linux kernel: usb 5-1: airprime converter now attached
to ttyUSB0
Aug 3 15:27:33 linux kernel: airprime 5-1:1.1: airprime converter
detected
Aug 3 15:27:33 linux kernel: usb 5-1: airprime converter now attached
to ttyUSB1 Open another xterm window (window B) and log in as root:
su
root
cat /dev/ttyUSB0 There should be additional output displayed in
xterm window A that was opened in step 1. Open another xterm window (window
C) and log in as root:
su root Unzip the included HSDPA script package:
unzip hsdpa_scripts.zip
cd hsdpa_scripts
cd hsdpa_apn_config Verify
the APN information:
vi hsdpa_apn_set Note: Do not remove the “^M”
at the end of the line or open this file in Windows. After verification,
exit the file.
Enter the following:
cat hsdpa_apn_set > /dev/ttyUSB0 Check
the output of the xterm window B opened in step 3 to verify that the APN information
is correctly set in the card. The response must match the arguments in the hsdpa_apn_set
file and an “OK” response should be in the last line of the window.
Copy the hsdpa_options and hsdpa_chatoptions files to the /etc/ppp directory.
Enter the following to verify that the user and password settings are correct:
vi /etc/ppp/hsdpa_options After verification, exit the file.
Connecting
To the Network
In this section, you will launch a ppp connection to the network. In
your main shell, enter:
pppd file /etc/ppp/hsdpa_options The connection
status from the kernel log appears in xterm window A that was opened in step 1
of Setting Up Your Equipment.. To verify that the modem is connected, locate
the following line after dialing up (it should be one of the last lines in the
log):
Aug 3 15:53:02 linux pppd[7990]: Script /etc/ppp/ip-up finished (pid
8077), status = 0x0 To confirm that the pppd daemon is associated with the
correct ttyUSB port, enter:
ps –e | grep pppd
You should see:
xxxx
ttyUSBx 00:00:00 pppd ttyUSBx should be the same as that output in step
2 of Setting Up Your Equipment. You are now connected to the network. Disconnecting
From the Network
To hang up the connection, enter:
killall pppd Verify
the ppp connectivity status using the following command:
ps –e | grep
pppd Disconnect the session before removing the card from the PC Card slot.
Otherwise a system reset may be required to use the card again.
Troubleshooting Dropped
connection
If the connection is lost because you are in a poor coverage area,
a manual reconnect is required by repeating the steps in Connecting to the Network. DNS
problem
If you experience DNS-related problems, verify the entries in the
/etc/resolv.conf file.
AT$NWRAT --------------------------------------------------------------------------------
Set command controls the preferred Radio Access Technology to be used by
the modem. Read command returns the preferred and current Radio
Access Technology being employed by the modem. Syntax Command
Response $NWRAT? $NWRAT: <mode>,<domain>,<state> $NWRAT=?
$NWRAT: (list of supported <mode>s, list of supported <domain>s) $NWRAT=<mode>,<domain>
OK, ERROR, +CME ERROR: <err> Values <mode> Value
Description 0 Automatic 1 GSM Only 2 WCDMA Only
<domain> Value Description 0 CS Only (Circuit Switched)
1 PS Only (Packet Swicthed) 2 CS+PS <state> Value
Description 0 Searching 1 WCDMA CS 2 WCDMA PS 3 WCDMA
CS+PS 4 GSM CS 5 GSM PS 6 GSM CS+PS Note When
switching the service domain within a specific mode (RAT) the modem would not
change its service domain unless it lost coverage or changed modes. For example,
if the modem is GSM PS and the following command is issued AT$NWRAT=1,0 to change
to GSM CS, the change will not occur until loss of coverage or change of RAT.
Example AT$NWRAT=2,2 set to WCDMA Only AT$NWRAT=1,2 set to
GSM Only |
