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ITU Wireless LAN

Other Considerations

In large meeting rooms, delegates are encouraged:
  • to use 802.11ac, 802.11n or 802.11a on the 5.2 GHz band as it offers many channels resulting in higher bandwidth per user;
  • to use wired Ethernet connection whenever it is available;
  • to disable the wireless adaptor when not in use. Wireless adaptors send out a lot of beacons even when not in use, occupying significant bandwidth that is valuable for those who are using it;
  • to disable Bluetooth devices when not in use as they use the same frequency range as the 2.4 GHz wireless LAN infrastructure;
  • not to use ad-hoc (or peer-to-peer) mode as they will interfere with the site’s wireless infrastructure.
 
As 802.11b devices slowdown 802.11g and 802.11n devices, the support for 802.11b is only available outside the big meeting rooms in ITU and CICG. Delegates may borrow 802.11agn wireless adaptors from the ITU reception or IS Service Desk, if required.
 
When buying a laptop or a wireless adaptor, please ensure they are “Wi-Fi compatible 802.11agn”. Good wireless performance can only be guaranteed for devices that support 802.11a, 802.11n and 802.11ac on the 5.2 GHz band. Please check that your card’s model number is mentioned at www.wi-fi.com. Note that cards labeled 802.11bgn do not support 5.2 GHz.
 
When connected to the ITU network, you remain responsible for the security of your devices. Please take your own measures to protect your data.
 
The use of non-ITU wireless access points at ITU is prohibited.
 
If your connected device is intentionally or unintentionally spreading malware, taking up too much bandwidth, becoming a DHCP server, trying to become a fake access point or ad-hoc wireless peer, etc., the IT staff has the right to take your machine off the network until the offending device has been purged of all malware.

Wireless troubleshooting

Practical tips to troubleshoot your wireless connection
  • Often, just rebooting the laptop fixes quite a number of connectivity problems. Sometimes problems such as VPN connections not working have been caused by the user putting his laptop in hibernation mode or sleep mode and not rebooting the laptop for extended periods.
  • If you cannot solve your wireless connectivity problems, please contact the IS Service Desk. You may need administrator privilege for some of the fixes, without which Service Desk staff won’t be able to help.
Some hints for advanced users
  • Set your wireless card to favor 802.11a/n/ac over 802.11b/g/n.
  • Ensure your wireless card is set to “infrastructure mode” and not “ad-hoc”.
  • Most cards are able to search for the radio channel automatically, but if your card does not support this function, try channels 36, 40, 44, 48, 52, 56, 60, 64 for 802.11a/n and channels 1, 6 or 11 for 802.11b/g/n. You may have to change to another channel if you move to another part of the building.
  • Make sure you have the latest software driver for the wireless adaptor by visiting the manufacturer’s support site. If not, install the new driver.
  • Ensure DHCP is enabled for the client so that you will get IP address and other network parameters automatically.
  • If your laptop has Bluetooth enabled then your 802.11b/g/n card may not work well – please disable Bluetooth.
  • Make sure that your web proxy configuration is set to off.
  • Make sure your proxy server is set to auto.
  • Make sure your firewall is not blocking the connection.
  • Some cards don't work unless a station ID (or Client Name) is set (station ID cannot be blank).
  • For Windows laptops, there may be more than one way to manage your wireless connections: (a) Using Windows itself, or (b) Using wireless client utility that came with the card. If you are using wireless client utility or third-party utilities to configure wireless, you may need to turn Wireless Zero Config service off to avoid conflict.