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January 22nd, 2013

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Slow wireless connection speed

This document deals with the following issue:

  • The wireless transmission rate is lower than the rate supported by the wireless standard.

Simply proceed as described below.

1 Preparations

  • Check which wireless standards the wireless device supports and what the maximum achievable tranmission rate is.
    Important:
    In the case of wireless standard 802.11n, the maximum transmission rate depends on the number of data streams and the channel bandwidth supported by the wireless device. Refer to the documentation or the manufacturer for the technical specifications of your device.Note:FRITZ!WLAN USB Stick supports the wireless standards 802.11g/b,
    FRITZ!WLAN USB Stick v2 supports 802.11n/g/b (802.11n with 150 Mbit/s gross),
    FRITZ!WLAN USB Stick N 2.4 supports 802.11n/g/b (802.11n with 150 Mbit/s gross),
    FRITZ!WLAN USB Stick N supports 802.11n/g/b/a (802.11n with 300 Mbit/s gross).

2 Comparing transmission rate with net transmission rate of wireless connection

The net transmission rate of the wireless standard being used is decisive for the transmission rate of user data (e.g. downloads). This is considerably lower than the gross transmission rate defined by the wireless standard being used. A large part of the gross rate is required for establishing and controlling the wireless connection and is not available for the actual data transfer.

Therefore, compare the transmission rate of the wireless connection with the net transmission rate:

  • Compare the transmission rate of your wireless connection with the net transmission rate of the wireless standard being used:
    Wireless standard Data stream /
    Channel Bandwidth
    Gross transmission rate up to Net transmission rate up to
    802.11n 2 / 40 MHz 300 Mbit/s 150 Mbit/s
    1 / 40 MHz 150 Mbit/s 75 Mbit/s
    2 / 20 MHz 130 Mbit/s 60 Mbit/s
    1 / 20 MHz 65 Mbit/s 30 Mbit/s
    802.11g 54 Mbit/s 25 Mbit/s
    802.11b 11 Mbit/s 5 Mbit/s
    Table: Transmission rate according to wireless standard

    Important:
    In the case of wireless standard 802.11n, the maximum transmission rate depends on the number of data streams and the channel bandwidth. Upon delivery (factory settings), the FRITZ!Box uses 40 MHz-wide radio channels.

If the transmission rate of the wireless connection is close to the possible net transmission rate, there is no problem with your wireless connection.

3 Selecting the wireless standard being used

  • If the wireless device establishes the connection according to wireless standard 802.11n:
  • If the wireless device establishes the connection according to wireless standard 802.11g or 802.11b:
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This Article was taken with permission from the AVM website Original Article.