• English
  • Japanese

Information about the SFC-CNS WLAN environment in classrooms

December 19, 2012
Users of SFC-CNS
Shonan Fujisawa ITC
Information about the SFC-CNS WLAN environment in classrooms

Due to frequent complaints about the difficulty in connecting to the CNS WLAN connection during classes, especially in the large classrooms in the Omega and Theta buildings, the ITC conducted an extensive on-site investigation into connectivity which determined the following:

  • There was channel saturation of all channels in the 2.4GHz band(802.11b/g), including channels not used for the CNS WLAN, leading to difficulties in connectivity.
  • It is thought that the operation of more than 10-20 personal mobile wireless routers (pocket Wi-Fi routers) consumes the wireless channels, causing more difficulties in connectivity.
  • The 5GHz band (802.11a) was found to be relatively uncongested, and there were no problems with usage or connectivity.
  • The use of non-WLAN devices which use the 2.4GHz band such as Bluetooth-enabled devices were seen to markedly consume the channels.

Based on these findings, it was concluded that it would be difficult to improve connectivity by simply replacing or expanding the base stations. Ultimately, the removal of mobile LAN routers, mobile phones, and Bluetooth-enabled devices which cause the interference is required.

Your cooperation with the following measures to improve connectivity during class time is therefore highly appreciated:

  • Please switch off all mobile wireless routers, Bluetooth-enabled devices, and any other devices that interfere with the WLAN environment in the classrooms.
  • Please turn off your mobile phone Wi-Fi hotspot functionality in classrooms.
  • Please use the 5GHz band (802.11a) wherever possible for personal computers. Some models are set to only use 2.4GHz band (802.11 b/g), even though they are 5GHz capable clients. Please contact the ITC CNS/ERNS Service Desk if you need assistance or for more details.

Thank you for your cooperation.

Last-Modified: December 19, 2012

The content ends at this position.