3G Cellular Modem installation failure on RHEL5

[jpalme2000]

I have failed to install an AT&T Sierra Wireless Aircard 881 on a Compaq 8510p running RHEL5 Server (Linux version 2.6.18-164.9.1.el5,gcc version 4.1.2 20080704, Red Hat 4.1.2-46. )

As seen in the dmesg output below, the OS detects the modem, connects it to ttyUSB0 - ttyUSB3. However, kppp is unable to access the modem.

I have followed Sierra Wireless instructions located at sierra wireless's website. (I would post it, but I've not made enough posts yet to link it in this message.) However, I was not able install the TRU-Install patch. The unusual_devs.h is absent on the machine, so patching was unsuccessful.

I'm stumped on what to try next. Is there a FAQ or guide on how to get a 3G modem running with RHEL5 Server? Ideally, I'd like to find something like the Internet Connection manager on Ubuntu. The modem works on that distro with no problems. I'm not able to migrate due to application and security certification dependencies on RHEL5 Server.

Your assistance is appreciated!

JP

lsusb output:
Bus 009 Device 001: ID 0000:0000
Bus 008 Device 002: ID 1199:6851 Sierra Wireless, Inc. AirCard 881 Device
Bus 008 Device 001: ID 0000:0000
Bus 003 Device 001: ID 0000:0000
Bus 007 Device 001: ID 0000:0000
Bus 006 Device 001: ID 0000:0000
Bus 002 Device 003: ID 0951:1625 Kingston Technology
Bus 002 Device 001: ID 0000:0000
Bus 001 Device 001: ID 0000:0000
Bus 004 Device 001: ID 0000:0000
Bus 005 Device 001: ID 0000:0000
Bus 005 Device 002: ID 08ff:2580 AuthenTec, Inc. AES2501 Fingerprint Sensor

dmesg output:
... SNIP (relevant portion shown)...
pccard: CardBus card inserted into slot 0
PCI: Enabling device 0000:03:00.0 (0000 -> 0002)
ACPI: PCI Interrupt 0000:03:00.0[A] -> GSI 16 (level, low) -> IRQ 177
PCI: Setting latency timer of device 0000:03:00.0 to 64
ohci_hcd 0000:03:00.0: OHCI Host Controller
ohci_hcd 0000:03:00.0: new USB bus registered, assigned bus number 8
ohci_hcd 0000:03:00.0: irq 177, io mem 0x8c000000
usb usb8: configuration #1 chosen from 1 choice
hub 8-0:1.0: USB hub found
hub 8-0:1.0: 1 port detected
PCI: Enabling device 0000:03:00.1 (0000 -> 0002)
ACPI: PCI Interrupt 0000:03:00.1[B] -> GSI 16 (level, low) -> IRQ 177
PCI: Setting latency timer of device 0000:03:00.1 to 64
ohci_hcd 0000:03:00.1: OHCI Host Controller
ohci_hcd 0000:03:00.1: new USB bus registered, assigned bus number 9
ohci_hcd 0000:03:00.1: irq 177, io mem 0x8c001000
usb usb9: configuration #1 chosen from 1 choice
hub 9-0:1.0: USB hub found
hub 9-0:1.0: 1 port detected
ohci_hcd 0000:03:00.0: wakeup
usb 8-1: new full speed USB device using ohci_hcd and address 2
usb 8-1: configuration #1 chosen from 1 choice
sierra 8-1:1.0: Sierra USB modem converter detected
usb 8-1: Sierra USB modem converter now attached to ttyUSB0
usb 8-1: Sierra USB modem converter now attached to ttyUSB1
usb 8-1: Sierra USB modem converter now attached to ttyUSB2

[jpalme2000]

I selected the wrong device in KPPP.

/dev/ttyUSBx is not the same as /dev/tty/USBx.