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In what places University WLAN can be used?

Where University WLAN works and how you read WLAN coverage maps.

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WLAN coverage is described in wireless coverage maps

The coverage for wireless LAN is presented in graphical maps, which you can find in WLAN coverage page (these pages are in Finnish but look for building codes).

Maps are set into hierarchical order, first by campus areas (Seminaarinmäki, Mattilanniemi, Ylistönrinne, Muut). Under each campus area you can find the buildings which already have, or, in near future will have an operational wireless LAN. Each building has been mapped by floors and if necessary, into floor parts.

How can I know if some room or space is covered by WLAN?

There is no direct room catalog for coverage. You can check the room or space by searching from WLAN coverage page the right campus area and the building you are looking for.

If you cannot find the building from the list, your room or space is not covered by WLAN. In these cases, for University meetings and training sessions, it may be possible to use temporary guest network with portable WLAN stations. Availability must be checked well beforehand.

If you find your building from the list, look for the correct floor. If it is a larger building, like Agora, each floor may have been split into floor parts. In these cases you must look for the correct part of the building. Notice that maps do not necessarely match the physical building blocks so your room or space may be in a part alongside.

If there is no link to floor or its part, the text defines the current situation. Either there is no WLAN coverage yet or the text describes the coverage.

If a floor (or its part) has a link to a page, you can see the WLAN coverage maps there.

How do I read the WLAN maps?

Look for the Signal Strength map. 

Maps are based on building maps. Signal strength is given by colors, of which the weakest is lilac, the strongest red. In between, the green, yellow and orange (from weak to stronger). You can expect WLAN to work where signal strength is at least light green (RSSI -70,0..-60,0).

If the room or space is not fully covered by light green (or better) signal strength color, WLAN may still work but the speed or relialibity may not be usable. If the room or space is fully outside the light green area, WLAN probably won't work or works badly.

The signal strength itself won't tell the whole truth about WLAN performance. It is affected by outside interference and noise (Signal-to-Noise Ratio), possible interference between the WLAN stations, number of WLAN stations heard (Access Point Count) and achievable data transfer speed (Data Rate).

The data transfer speed depends on network load; how many simultaneous users are using single WLAN station bandwidth. The more there are users per WLAN station, the smaller slice each user gets from the available bandwidth. Single WLAN station can accept max. 15 simultaneous users per network (jyu-guest, jyu-student, jyu-staff).

In Data Rate map the lowest functional speed is 11Mbs. As a map color 11Mbps is lighter green, the faster ones are marked from yellow to orange. Data rate map has been done assuming 80% bandwidth usage, so lesser load gives better result than the map predicts.

Also your wireless client antenna affects the WLAN performance. Laptop integrated antenna is usually better than the external small (PCMCIA, USB) network card antenna.

The maps are measured with a PCMCIA network card so the usable area with better antenna may be wider.

More information

WLAN coverage page

WLAN guides

Kwok Ng
Kwok Ng says:
Aug 17, 2010 10:46 PM
Are choices are there for the Viveca building?
Mika Huurre
Mika Huurre says:
Aug 18, 2010 09:36 AM
WLAN coverage page has been updated.
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