Why three ttyUSB{0..2} on wireless broadband?
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From: Ignoramus22882 on 26 Jan 2010 17:17 I have recently changed one wireless broadband card for another. These cards basically work through usbserial driver, pppd and NetworkManager, and the part with making connections is relatively straightforward. The only trouble is that every modem requires Windows XP to be initialized once. But I can live with it. NetworkManager uses ttyUSB0 for making connection and does NOT use ttyUSB1 and ttyUSB2. And here comes my question, why are there ports ttyUSB1 and ttyUSB2, they probably serve some purpose on the cards. Since both of those support GPS under Windows, I am assuming that perhaps one of them is for GPS. If so, can they just be used with, say, gpsd? Is there some trick to it? I have tried using gpsd with those ttyUSB1 and ttyUSB2 and got essentially nothing back. But if I can get precise time or even GPS position, I would be very happy. i
From: Wolfgang Draxinger on 26 Jan 2010 18:08 Ignoramus22882 wrote: > And here comes my question, why are there ports ttyUSB1 and ttyUSB2, > they probably serve some purpose on the cards. For example use ttyUSB0 for your ppp connection, ttyUSB1 to send/recieve text messages and query the network status (signal strength, used carrier), and ttyUSB2 for the GPS NMEA data. > Since both of those support GPS under Windows, I am assuming that > perhaps one of them is for GPS. Actually any of them can do it. > If so, can they just be used with, say, gpsd? > > Is there some trick to it? You must enable the GPS mode. However be warned, that the only way to switch that off is a full reset of the modem. Here's a nice command reference, look for GPS in it. http://www.natisbad.org/E4300/Dell_Wireless_5530_AT_cmd_ref.html Once activated gpsd, TangoGPS and the like work just fine. Wolfgang
From: Chris Davies on 26 Jan 2010 18:15 In comp.os.linux.misc Ignoramus22882 <ignoramus22882(a)nospam.22882.invalid> wrote: > I have recently changed one wireless broadband card for another. Details!! > These cards basically work through usbserial driver, pppd and > NetworkManager, and the part with making connections is relatively > straightforward. The only trouble is that every modem requires Windows > XP to be initialized once. But I can live with it. Why live with it? Tell us what card you've got (and its USB/PCI identity) and it's possible there's already someone out here with a fix. > And here comes my question, why are there ports ttyUSB1 and ttyUSB2, > they probably serve some purpose on the cards. My card uses one for data and the other for control. > I have tried using gpsd with those ttyUSB1 and ttyUSB2 and got > essentially nothing back. But if I can get precise time or even GPS > position, I would be very happy. Without knowing anything about the card you've got, it's impossible to give any useful suggestions. Chris
From: Wolfgang Draxinger on 26 Jan 2010 19:06 Chris Davies wrote: > Why live with it? Tell us what card you've got (and its USB/PCI identity) > and it's possible there's already someone out here with a fix. Didn't read that one earlier. There's this tool usbmodeswitch (google it), which does this trick, i.e. sending a magic string to initialize. > My card uses one for data and the other for control. Probably you can interchange those just fine. > Without knowing anything about the card you've got, it's impossible to > give any useful suggestions. Those 3G modems mostly behave the same. That's probably due to the fact, that there are only four vendors of 3G baseband, and the protocoll on the serial basically is some extended GSM AT command set. Wolfgang
From: Ignoramus22882 on 26 Jan 2010 19:25
On 2010-01-26, Chris Davies <chris-usenet(a)roaima.co.uk> wrote: > In comp.os.linux.misc Ignoramus22882 <ignoramus22882(a)nospam.22882.invalid> wrote: >> I have recently changed one wireless broadband card for another. > > Details!! The new card is "u300" , see here http://www.boygeniusreport.com/4g/4g-products/sprint-3g4g-u300-wireless-modem/ I use Sprint as my network. I needed to add the following rules to udev rules: ACTION!="add", GOTO="3G_End" SUBSYSTEMS=="usb", ATTRS{idProduct}=="6002", ATTRS{idVendor}=="16d8", RUN+="/sbin/modprobe usbserial vendor=0x16d8 product=0x6002" LABEL="3G_End for the card to be auto-recognized. See http://jebus.nu/tech-corner/sprint-u300 > >> These cards basically work through usbserial driver, pppd and >> NetworkManager, and the part with making connections is relatively >> straightforward. The only trouble is that every modem requires Windows >> XP to be initialized once. But I can live with it. > > Why live with it? Tell us what card you've got (and its USB/PCI identity) > and it's possible there's already someone out here with a fix. 0x16d8:0x6002 is the ID. Initialization of this device possibly involves communication with sprint that deals with billing information, so I would suspect it to be not so easy, but I would love to be wrong. > >> And here comes my question, why are there ports ttyUSB1 and ttyUSB2, >> they probably serve some purpose on the cards. > > My card uses one for data and the other for control. OK, but on mine there are three ports. > >> I have tried using gpsd with those ttyUSB1 and ttyUSB2 and got >> essentially nothing back. But if I can get precise time or even GPS >> position, I would be very happy. > > Without knowing anything about the card you've got, it's impossible to > give any useful suggestions. Sure. I will provide any info that you might want. |