Can't access configuration setup

Turn your DSL/cable modem off.
Turn your ZYXEL router off.
Turn your DSL/cable modem on.
Turn your ZYXEL router on.
Restart your computer.
You should now have an Internet connection.

Connect it to the ISP modem via a Ethernet cable, Use this setup manual: http://shop.centurylink.com/internethelp/modems/pk5000z/pdf/PK5000Z-WEP.pdf

Either your web-browser has "cached" the web-page previously delivered by the TILGIN,
or your computer is still connected to the TILGIN.

In the former case, "reload" the web-page.
In the latter case, turn off the TILGIN router, and try again to connect to the ZYXEL router.
Also, check that your network-cables are correctly connected to one of the LAN ports on the ZYXEL router.

you may be suffering from mixed Cat 5 and Cat 6 cabling.
The wiring is slightly different and they don't work well when mixed in routers and modems etc. One or the other will work , but when they're mixed it'll do what you have going on here...

I would recommend wiring everything with cat 6 ethernet cabling. Look on your cable and you will find the labeling on the outer casing.

The user manual has the default username and password. if you didn't get a paper manual, check the cd, the manual may be on the cd in a manual folder.

check weather urwireless zero configuration is disable go to the my computer right in that manage in the manage go to the services in that go to the services in that one service is there in down wireless zero configuration just start it if already start just go for the restart

To access Zyxel configuration/setup utility, launch a web browser (Internet Explorer, Opera, Firefox, or Netscape, etc.) on your computer, type in http://192.168.1.1 (default IP address for most Zyxel wireless devices) in your Internet browser's Location/Address bar, and then press Enter on your keyboard. 
If presented with a user authentication (login) screen, try the following:

Default Username - Zyxel Wireless Router: N/A (none, leave blank)
Default Password - Zyxel Wireless Router : 1234 

If you cannot login using the above, verify that (a) you are entering your password correctly, and that (b) your CAPSLOCK key is off. It could also be due to the firmware (a set of instructions stored on an EEPROM microchip) on your Zyxel product being corrupt. If so, you would need to reset your Zyxel WiFi router to its factory default settings.

IMPORTANT: Do not forget to promptly secure your Zyxel router (using a strong password, a non-obvious WEP Key, etc.) following a reset to factory default settings. Failing to do so may potentially expose your entire WLAN to scammers.

*Your vote is highly appreciated. Thanks in advance.

if you only have usb connection in your modem, internet on the zyxel router will not work since it's using ethernet connection. in order for your zyxel device to work with tiscali, you will need a cable/dsl router that has ethernet connection as well. you can contact tiscali if they can provide you with that kind of modem.

hope this'll help you

ciao

um is it compatible with vista and/or upgradable?

List of user guides for Zyxel modems: http://www.zyxel.com/web/support_download_list.php?indexflag=20040906173729