Perle Systems Sds4 Manuel d'utilisateur télécharger pdf (Page 454)

Troubleshooting the USB Modem 453

USB Modem Support and Custom Options

As far as the driver can tell, the USB modem is functioning correctly. If there is no wireless

network connectivity, verify the APN, phone number and optional PIN#, user and password

settings. Each service provider’s network will have different requirements. See

Configuring

a USB Modem .

If this does not resolve the problem, use the Vendor id and product id to search the linux

community for any problems with this particular device. If the recommendation is to use a

device name override, use the “usb create modem-file devname ttyUSBn” (n = 1 to 4) to

create the override option. Please remember to save your changes and either reset the PCI

option line service or reboot the IOLAN, in order for the changes to take effect.

USB Modem Support and Custom Options

While we strive to include support for as wide a range of USB modems as possible, our support for

USB modems is currently limited to the Communication Device Class Abstract Control Model

interface (dev/ttyACMx device node), and the USB Serial Converter support for generic GSM and

CDMA modems interface (dev/ttyUSBx device node). The IOLAN attempts to initialize the USB

modem assuming the CDC-ACM type device, and after 30 seconds and multiple retries, it will try to

initialize using the USB serial converter generic GSM/CDMA method. This latter method, requires a

USB communication utility called “usb_modeswitch” that has a database of USB modems of this

class. Should you have a USB modem that is not in our database, but is available by way of the

linux internet community, please follow instruction below on how to download the file to the IOLAN.

or contact Perle support for assistance.

There are also USB modems that require that a different device node be used other than the default

/dev/ttyUSB0 device nodes. If after validating your USB modem configuration, you still do not have

wireless connectivity, you may need to search through the Linux community using your USB

modem’s vendor id and product id, to determine if an override for the device node is required. The

“usb modem status” command will output the information you need to do the search for connectivity

issues in the linux community. To override the default device name, please use the following

command:

usb create modem-file devname ttyUSBn (where n is an interface number between 1 - 4)

Should you find it necessary to remove the devname override, please use the “usb delete modem-file”

command. This command will also remove any custom, downloaded usb_modem and modeswitch

files (see next section).

Downloading Custom USB Modem Configuration Files

If you have a usb_modeswitch file which you have found for your USB modem and this modem is

not currently in the IOLAN database, you can download the file as follows;

1) Connect a terminal to the IOLAN using the console port and cable.

2) Login as admin

3) Issue the following CLI command;

netload customapp-file <ip_address> <filename>

ip_address is the address of your tftp server

filename is the usb_modeswitch file full path and name

This will transfer the usb_modeswitch file from your TFTP server to the IOLAN. The file name is in

the format “vvvv:pppp” where;

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Perle Systems Sds4 Manuel d'utilisateur Page 454

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