FRITZ!Box 7490 Service - Knowledge Base

FRITZ!Box 7490 Service

Slow wireless connection (low data rate)

The data rate of the wireless connection (WiFi) established by a wireless device, for example a computer, smartphone, or tablet, to the FRITZ!Box is lower than allowed by the wireless standard. As a result, web pages load slowly, it takes a long time to download files, and video streams are either not displayed correctly or stop playing, for example.

1 Checking which wireless standards the wireless device supports

  • Find out which wireless standards the wireless device supports and the maximum data rate it can establish wireless connections with. Refer to the manufacturer for information on the wireless device, for example consult the manual.

    Note:FRITZ!WLAN Stick AC 430 supports 802.11ac/n/g/b/a (802.11ac with 433 Mbit/s gross),
    FRITZ!WLAN Stick N supports 802.11n/g/b/a (802.11n with 300 Mbit/s gross),
    FRITZ!WLAN Stick supports 802.11n/g/b (802.11n with 150 Mbit/s gross).

2 Determining the user data rate of the wireless connection

The user data rate of the wireless standard being used determines the speed at which data is transmitted over wireless connections. The user data rate is significantly lower than the data rate given for wireless standards since a large part of it is required to establish and control the wireless connection.

  • Determine the user data rate of the wireless connection according to the standard being used by the wireless device:
    Wireless standardData streams /
    Channel bandwidth
    Data rate up toUser data rate up to
    802.11ac 3 / 80 MHz 1300 Mbit/s 650 Mbit/s
    2 / 80 MHz 866 Mbit/s 300 Mbit/s
    1 / 80 MHz 433 Mbit/s 200 Mbit/s
    3 / 40 MHz 600 Mbit/s 220 Mbit/s
    2 / 40 MHz 400 Mbit/s 180 Mbit/s
    1 / 40 MHz 200 Mbit/s 90 Mbit/s
    3 / 20 MHz 260 Mbit/s 120 Mbit/s
    2 / 20 MHz 173 Mbit/s 80 Mbit/s
    1 / 20 MHz 86 Mbit/s 40 Mbit/s
    802.11n 3 / 40 MHz 450 Mbit/s 200 Mbit/s
    2 / 40 MHz 300 Mbit/s 150 Mbit/s
    1 / 40 MHz 150 Mbit/s 75 Mbit/s
    3 / 20 MHz 195 Mbit/s 90 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
    802.11a - 54 Mbit/s 25 Mbit/s
    Table: Throughput rates according to wireless standard

    Important:The maximum data rate for wireless standards 802.11n and 802.11ac depends on the number of data streams and the channel bandwidth. By default, the FRITZ!Box uses radio channels that are 40 MHz (802.11n) or 80 MHz (802.11ac) wide.

If the data throughput of the wireless device is nearly as high as the user data rate of the wireless connection, there is no error.

3 Optimizing the wireless connection

Perform the following step if the data throughput of the wireless device is significantly lower than the user data rate of the wireless connection: