tail -f /var/log/messages

Jan 21 15:36:47 (none) user.info kernel: usb 2-1: new low speed USB device using uhci_hcd and address 10
Jan 21 15:36:47 (none) user.err kernel: usb 2-1: device descriptor read/64, error -71
Jan 21 15:36:47 (none) user.err kernel: usb 2-1: device descriptor read/64, error -71
Jan 21 15:36:48 (none) user.info kernel: usb 2-1: new low speed USB device using uhci_hcd and address 11
Jan 21 15:36:48 (none) user.err kernel: usb 2-1: device descriptor read/64, error -71
Jan 21 15:36:48 (none) user.err kernel: usb 2-1: device descriptor read/64, error -71
Jan 21 15:36:48 (none) user.info kernel: usb 2-1: new low speed USB device using uhci_hcd and address 12
Jan 21 15:36:49 (none) user.err kernel: usb 2-1: device not accepting address 12, error -71
Jan 21 15:36:49 (none) user.info kernel: usb 2-1: new low speed USB device using uhci_hcd and address 13
Jan 21 15:36:49 (none) user.err kernel: usb 2-1: device not accepting address 13, error -71



dmesg
3-0:1.0: USB hub found
hub 3-0:1.0: 2 ports detected
ACPI: PCI Interrupt 0000:00:10.3[B] -> Link [LNKB] -> GSI 11 (level, low) -> IRQ 11
uhci_hcd 0000:00:10.3: UHCI Host Controller
uhci_hcd 0000:00:10.3: new USB bus registered, assigned bus number 4
uhci_hcd 0000:00:10.3: irq 11, io base 0x0000e400
usb usb4: configuration #1 chosen from 1 choice
hub 4-0:1.0: USB hub found
hub 4-0:1.0: 2 ports detected
usb 2-1: new low speed USB device using uhci_hcd and address 2
usb 2-1: device descriptor read/64, error -71
usb 2-1: device descriptor read/64, error -71
usb 2-1: new low speed USB device using uhci_hcd and address 3
usb 2-1: device descriptor read/64, error -71
usb 2-1: device descriptor read/64, error -71
usb 2-1: new low speed USB device using uhci_hcd and address 4
usb 2-1: device not accepting address 4, error -71
usb 2-1: new low speed USB device using uhci_hcd and address 5
usb 2-1: device not accepting address 5, error -71
usb 3-1: new low speed USB device using uhci_hcd and address 2
usb 3-1: configuration #1 chosen from 1 choice
input: Microsoft Basic Optical Mouse as /class/input/input2
input: USB HID v1.10 Mouse [Microsoft Basic Optical Mouse] on usb-0000:00:10.2-1
ACPI: PCI Interrupt 0000:00:10.4[C] -> Link [LNKC] -> GSI 10 (level, low) -> IRQ 10
ehci_hcd 0000:00:10.4: EHCI Host Controller
ehci_hcd 0000:00:10.4: new USB bus registered, assigned bus number 5
ehci_hcd 0000:00:10.4: irq 10, io mem 0xf6001000
ehci_hcd 0000:00:10.4: USB 2.0 started, EHCI 1.00, driver 10 Dec 2004
usb usb5: configuration #1 chosen from 1 choice
hub 5-0:1.0: USB hub found
hub 5-0:1.0: 8 ports detected
usb 3-1: USB disconnect, address 2
usb 3-1: new low speed USB device using uhci_hcd and address 3
usb 3-1: configuration #1 chosen from 1 choice
input: Microsoft Basic Optical Mouse as /class/input/input3
input: USB HID v1.10 Mouse [Microsoft Basic Optical Mouse] on usb-0000:00:10.2-1
usb 2-1: new low speed USB device using uhci_hcd and address 6
usb 2-1: device descriptor read/64, error -71
usb 2-1: device descriptor read/64, error -71
usb 2-1: new low speed USB device using uhci_hcd and address 7
usb 2-1: device descriptor read/64, error -71
usb 2-1: device descriptor read/64, error -71
usb 2-1: new low speed USB device using uhci_hcd and address 8
usb 2-1: device not accepting address 8, error -71
usb 2-1: new low speed USB device using uhci_hcd and address 9
usb 2-1: device not accepting address 9, error -71
usbcore: registered new driver cdc_acm
drivers/usb/class/cdc-acm.c: v0.25:USB Abstract Control Model driver for USB modems and ISDN adapters
ehci_hcd 0000:00:10.4: remove, state 1
usb usb5: USB disconnect, address 1
ehci_hcd 0000:00:10.4: USB bus 5 deregistered
ACPI: PCI interrupt for device 0000:00:10.4 disabled
uhci_hcd 0000:00:10.3: remove, state 1
usb usb4: USB disconnect, address 1
uhci_hcd 0000:00:10.3: USB bus 4 deregistered
ACPI: PCI interrupt for device 0000:00:10.3 disabled
uhci_hcd 0000:00:10.2: remove, state 1
usb usb3: USB disconnect, address 1
usb 3-1: USB disconnect, address 3
uhci_hcd 0000:00:10.2: USB bus 3 deregistered
ACPI: PCI interrupt for device 0000:00:10.2 disabled
uhci_hcd 0000:00:10.1: remove, state 1
usb usb2: USB disconnect, address 1
uhci_hcd 0000:00:10.1: USB bus 2 deregistered
ACPI: PCI interrupt for device 0000:00:10.1 disabled
uhci_hcd 0000:00:10.0: remove, state 1
usb usb1: USB disconnect, address 1
uhci_hcd 0000:00:10.0: USB bus 1 deregistered
ACPI: PCI interrupt for device 0000:00:10.0 disabled
usbcore: deregistering driver usbhid
usbcore: deregistering driver hiddev
usbcore: deregistering driver cdc_acm
USB Universal Host Controller Interface driver v2.3
ACPI: PCI Interrupt 0000:00:10.0[A] -> Link [LNKA] -> GSI 11 (level, low) -> IRQ 11
uhci_hcd 0000:00:10.0: UHCI Host Controller
uhci_hcd 0000:00:10.0: new USB bus registered, assigned bus number 1
uhci_hcd 0000:00:10.0: irq 11, io base 0x0000e100
usb usb1: configuration #1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
ACPI: PCI Interrupt 0000:00:10.1[A] -> Link [LNKA] -> GSI 11 (level, low) -> IRQ 11
uhci_hcd 0000:00:10.1: UHCI Host Controller
uhci_hcd 0000:00:10.1: new USB bus registered, assigned bus number 2
uhci_hcd 0000:00:10.1: irq 11, io base 0x0000e200
usb usb2: configuration #1 chosen from 1 choice
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 2 ports detected
ACPI: PCI Interrupt 0000:00:10.2[B] -> Link [LNKB] -> GSI 11 (level, low) -> IRQ 11
uhci_hcd 0000:00:10.2: UHCI Host Controller
uhci_hcd 0000:00:10.2: new USB bus registered, assigned bus number 3
uhci_hcd 0000:00:10.2: irq 11, io base 0x0000e300
usb usb3: configuration #1 chosen from 1 choice
hub 3-0:1.0: USB hub found
hub 3-0:1.0: 2 ports detected
ACPI: PCI Interrupt 0000:00:10.3[B] -> Link [LNKB] -> GSI 11 (level, low) -> IRQ 11
uhci_hcd 0000:00:10.3: UHCI Host Controller
uhci_hcd 0000:00:10.3: new USB bus registered, assigned bus number 4
uhci_hcd 0000:00:10.3: irq 11, io base 0x0000e400
usb usb4: configuration #1 chosen from 1 choice
hub 4-0:1.0: USB hub found
hub 4-0:1.0: 2 ports detected
usb 2-1: new low speed USB device using uhci_hcd and address 2
usb 2-1: device descriptor read/64, error -71
usb 2-1: device descriptor read/64, error -71
usb 2-1: new low speed USB device using uhci_hcd and address 3
usb 2-1: device descriptor read/64, error -71
usb 2-1: device descriptor read/64, error -71
usb 2-1: new low speed USB device using uhci_hcd and address 4
usb 2-1: device not accepting address 4, error -71
usb 2-1: new low speed USB device using uhci_hcd and address 5
usb 2-1: device not accepting address 5, error -71
usb 3-1: new low speed USB device using uhci_hcd and address 2
usb 3-1: configuration #1 chosen from 1 choice
usbcore: registered new driver cdc_acm
drivers/usb/class/cdc-acm.c: v0.25:USB Abstract Control Model driver for USB modems and ISDN adapters
ohci_hcd: 2005 April 22 USB 1.1 'Open' Host Controller (OHCI) Driver (PCI)
ACPI: PCI Interrupt 0000:00:10.4[C] -> Link [LNKC] -> GSI 10 (level, low) -> IRQ 10
ehci_hcd 0000:00:10.4: EHCI Host Controller
ehci_hcd 0000:00:10.4: new USB bus registered, assigned bus number 5
ehci_hcd 0000:00:10.4: irq 10, io mem 0xf6001000
ehci_hcd 0000:00:10.4: USB 2.0 started, EHCI 1.00, driver 10 Dec 2004
usb usb5: configuration #1 chosen from 1 choice
hub 5-0:1.0: USB hub found
hub 5-0:1.0: 8 ports detected
usb 2-1: new low speed USB device using uhci_hcd and address 6
usb 2-1: device descriptor read/64, error -71
usb 2-1: device descriptor read/64, error -71
usb 2-1: new low speed USB device using uhci_hcd and address 7
usb 2-1: device descriptor read/64, error -71
usb 2-1: device descriptor read/64, error -71
usb 2-1: new low speed USB device using uhci_hcd and address 8
usb 2-1: device not accepting address 8, error -71
usb 2-1: new low speed USB device using uhci_hcd and address 9
usb 2-1: device not accepting address 9, error -71
usb 3-1: USB disconnect, address 2
usb 3-1: new low speed USB device using uhci_hcd and address 3
usb 3-1: configuration #1 chosen from 1 choice
usbcore: deregistering driver cdc_acm
usbcore: registered new driver cdc_acm
drivers/usb/class/cdc-acm.c: v0.25:USB Abstract Control Model driver for USB modems and ISDN adapters
usb 2-1: new low speed USB device using uhci_hcd and address 10
usb 2-1: device descriptor read/64, error -71
usb 2-1: device descriptor read/64, error -71
usb 2-1: new low speed USB device using uhci_hcd and address 11
usb 2-1: device descriptor read/64, error -71
usb 2-1: device descriptor read/64, error -71
usb 2-1: new low speed USB device using uhci_hcd and address 12
usb 2-1: device not accepting address 12, error -71
usb 2-1: new low speed USB device using uhci_hcd and address 13
usb 2-1: device not accepting address 13, error -71

How about an actual question, some symptoms of what it's doing/not doing, and something about what version/distro of Linux you're running????

Pasting log files and not saying anything else, isn't a good way to get help.

Achully these logs from puppy Linux(with kernel 2.6.16.7) when i m connecting a TATA FWP modem with usb cable .I get these logs .But same message i get from fedora 7(with kernel 2.6.23.17-88) and centos 5 (with kernal 2.6.18.20)also

Great...now we know where the logs come from.

WHAT'S YOUR ACTUAL QUESTION OR PROBLEM????

Actully My problem is that i cannot connect to the modem ?????????
and i m getting this type of logs