Creating Udev Rule file for Modem

[ketan985]

I have a modem with 16 ports using for sending SMS.
When it's connected to my Linux machine, I get 16 ports from ttyUSB0 to ttyUSB15. Currently if I remove this modem and attached another it,I get it 16 ports from ttyUSB0 to ttyUSB15.
How can I reserve first 16 ports for specific vendor with creating udev file, so when I remove this modem it and insert another one, it is assigned from ttyUSB16 onwards?

My udev rule file Contents are as follows, which is working but port number changes everytime I replug

Name=="Future Technology Devices International,Ltd",SUBSYSTEMS=="usb", ATTRS{idProduct}=="6011", ATTRS{idVendor}=="0403", SYMLINK="Ketan%b", KERNEL=="ttyUSB[0-15]*", MODE="0666", SYMLINK+="ttyUSB1",

Output

ls -l /dev/K*
lrwxrwxrwx 1 root root 7 2013-01-08 15:09 /dev/Ketan-8.1 -> ttyUSB1
lrwxrwxrwx 1 root root 7 2013-01-08 15:09 /dev/Ketan-8.2 -> ttyUSB5
lrwxrwxrwx 1 root root 8 2013-01-08 15:09 /dev/Ketan-8.3 -> ttyUSB11
lrwxrwxrwx 1 root root 8 2013-01-08 15:09 /dev/Ketan-8.4 -> ttyUSB12


Here ports are 16 but they are divided in Group of four. ttyUSB 1,5,11,12 Values are changing every time I Plug modem.
How I assign fix numbers to that ports ??

[vasiliscnisrok]

give me

lsusb

[ketan985]

Here it is

root@AMPM:~# lsusb
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 007: ID 0403:6011 Future Technology Devices International, Ltd
Bus 001 Device 006: ID 0403:6011 Future Technology Devices International, Ltd
Bus 001 Device 005: ID 0403:6011 Future Technology Devices International, Ltd
Bus 001 Device 004: ID 0403:6011 Future Technology Devices International, Ltd
Bus 001 Device 003: ID 0409:005a NEC Corp. HighSpeed Hub
Bus 001 Device 002: ID 0781:5567 SanDisk Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
root@AMPM:~#

[vasiliscnisrok]

1) change KERNEL - remove *

SUBSYSTEMS=="usb", KERNEL=="ttyUSB[0-15]", ATTRS{idVendor}=="0403", ATTRS{product}=="6011", NAME=="AMPM" , SYMLINK=="AMPM", GROUP="tty", MODE="0660"

2) try

udevadm monitor --kernel --udev /dev/ttyUSB0

[ketan985]

When I execute that command It does processing but it returns nothing showing just cursor,

kk@kk# udevadm monitor --kernel --udev /dev/ttyUSB*
monitor will print the received events for:
UDEV - the event which udev sends out after rule processing
KERNEL - the kernel uevent