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      Introduction to some technical parameters of Lenovo 802.11n wireless adapter

      Statement Description

      This article gives an introduction to the technical parameters of Lenovo 802.11n wireless adapter to make users find a balance between the performance and specification of their wireless card more easily.

      Affected Configurations

      The above symptom may occur on the following systems:

      All Idea laptops, desktops 

      All Lenovo laptops, desktops

      All Lenovo tablets


      Wireless card’s performance has something to do with multipath such as SISO or MISO, bandwidth such as 40MHz or 20MHz and other factors. However throughput is the “real” measure of performance and it is the transmission capability that is available to applications after the overhead required to address the needs of upper layer protocols has been addressed. By definition, throughput is a subset of a device’s physical layer data rate while data rate is an expression of a device’s raw transmission capability at the lowest, physical layer.

      MIMO (multiple input multiple output) leverages multipath. A MIMO system has a number of transmitters (N) and receivers (M) and a MIMO device with multiple antennas is capable of sending multiple spatial streams – spatially distinct data streams within the same channel. Of course the numerical value of N and M has much to do with wireless card’s performance.

      While 802.11 a/b/g networks operate in a 20 MHz channel, 802.11n defines the use of 20 and 40 MHz channels. 40 MHz channels allow doubling of the data rate to 150 Mbps.

      MIMO and channelization both directly affect a device’s data rate. According to different types of MIMO and different spatial stream (up) x spatial stream (down), 11n can be divided into several types as below, each with its own designed highest rate (bit/sec) and estimated maximum throughput (Bytes / sec).

      Table 1 below offers some information about different MIMO and channelization.

        MAX data rate Estimated MAX throughput(Byte=8bits)
        40MHz Bandwidth 20MHz Bandwidth 40MHz Bandwidth 20MHz Bandwidth
      135 or 150Mbps/
      135 or 150Mbps
      65 or 72.22Mbps/
      65 or 72.22Mbps
      9-10MBps/9-10MBps 4-5MBps/4-5MBps
      135 or 150Mbps/
      270 or 300Mbps
      65 or 72.22Mbps/
      130 or144.44Mbps
      9-10MBps/18-20MBps 4-5MBps/9-10MBps
      270 or 300Mbps/
      270 or 300Mbps
      130 or144.44Mbps/
      130 or144.44Mbps
      18-20MBps/18-20MBps 9-10MBps/9-10MBps
      270 or 300Mbps/
      405 or 450Mbps
      130 or 144.44Mbps/
      195 or 216.7Mbps
      18-20MBps/29-30MBps 9-10MBps/14-15MBps
      405 or 450Mbps/
      405 or 450Mbps
      195 or 216.7Mbps/
      195 or 216.7Mbps
      29-30MBps/29-30MBps 14-15MBps/14-15MBps

      Table 1 

      According to some parameters above, users could get a rough comprehension about the relationship between data rate and MIMO as well as bandwidth. Table 2 below offers these technical parameters of some types of Lenovo 802.11n wireless adapter. Users could find a balance between performance and specification of their wireless card combining two tables together

      Wireless Card Support MIMO 40M bandwidth Theoretical maximum
      data rate (Mbps)
      Intel 1000 1X2 bgn support, default is disabled UL:150 DL:300
      Intel 6250 2X2 abgn+wimax support, default is disabled UL:300 DL:300
      AR9285 1X1 bgn support, default is disabled UL:150 DL:150
      Broadcom 4313 1X1 bgn not support UL:65 DL:65
      Intel 5100 1x1 abgn support, default is disabled UL:65 DL:65
      Intel 6200 2x2 abgn support, default is disabled UL:300 DL:300
      AR9283 2x2 bgn support, default is disabled UL:300 DL:300
      BCM43225 2 x2 bgn support, default is disabled UL:300 DL:300

      Table 2


      SISO—single input, single output

      MISO—multiple input, single output

      MIMO—multiple input, multiple output





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      • Alias ID: 12796077698544
      • Document ID: HT070352
      • Last Updated :20 May 2015
      • © 2016 Lenovo