Infinet Wireless: Technical Documentation
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Table of Contents

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Scroll Title
titleFigure - Radio

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The radio page is divided in two sections:

  • "Radio settingsSettings" - allows you to configure  general  configure general radio parameters and features:
    • General parameters
    • Air Frame
    • Radio Front EndFrontend
    • Modulation
    • Radio frameAutomatic Modulation and Transmit Power Control
  • "Frequency Grid and LimitationsChannel Grids" - specifies the  the default and custom  custom frequency domains for each  bandwidth (10 MHz, 20 MHz, 40 MHz).

Radio

...

Settings

The following radio parameters can be configured under the "Radio settingsSettings" section:

Center
You can use this parameter to select the traffic prioritization strategy. The following options are available:
Scroll Title
titleTable - Radio settings
Radio parameterDescription
General
Node Type
  • Set the node type to Master or Slave
  • In the point-to-point link, one unit must be set to Master and the other one to Slave
QoS Strategy
  • “normal” provides a balance between packet loss and throughput. It is used by default.               
  •  “aggressive” gives maximum throughput with a minor priority packet loss allowed
  • “conservative” assures no priority packet loss, but with small decline in the peak throughput
  • “off” disables prioritization
    • Channel Width
    Link ID
    • Use this parameter to avoid connecting a unit to a wrong peer if there are several co-located units using the same center frequency
    • Specify different ID values for different link. Both ends of the same link must have the same ID. The value range is 0…15 in increments of 1
    Downlink Frequency
    • Allows you to configure the downlink center frequency in MHz (can be different from the UL frequency for the models which support H-FDD)
    • Downlink Frequency refers to the set frequency for communication in downlink direction - from the Master unit to the Slave unit
    Uplink Frequency
    • Allows you to configure the uplink center frequency in MHz (can be different from the DL frequency for the models which support H-FDD)
    • Uplink Frequency refers to the set frequency for communication in uplink direction - from the Slave unit to the Master unit
    Traffic Prioritization
    • Enable/disable prioritization strategy. Unit will recognize the 802.1p tags in Ethernet frame headers. Based on these tags priorities will be autlomatically assigned to the frames when they are sent over the radio interface. After transmission over radio interface frames with tags are sent to Ethernet. Priorities may be adjusted manually (Configuring per-VLAN 802.1p priority).
    Note
    titleNOTE

    If "VLAN-based Switching" is enabled and prioritization is configured for "Default VLAN", tags priorities will be autlomatically assigned to the frames when they are sent over the radio interface. In this case port modes must differ from "Untagged" and "Off".

    Security Key
    • Set the secret key word for encoding of the protocol messages
      • It must be up to 64 characters long, without spaces
      • It must be the same at both ends of the link
    Air Frame
    Channel Width (MHz)
    • Allows you to configure the channel width (in MHz). The possible values are: 10, 20 or 40 MHz
    Transmit PowerMaximal  MCS
    • Allows you to configure the maximum MCS that can be used
    AMC Strategy
    • Allows you to select the AMC algorithm strategy:
      • “conservative” assumes using higher CINR thresholds in order to minimize the error rate
      • “aggressive” lowers the thresholds in order to use higher modulation levels and thus increase the throughput
      • “normal” represents a balance between the error rate and throughput values
    TDD Synchronization
    • Allows you to configure the TDD synchronization source:
      • “freerun” unsynchronized frame start
      • “gnss” synchronization from built-in GPS/GLONASS receiver
    • Allows you to configure the transmit power level (in dBm). The value range is 0…27 dBm in increments of 1 dBm
    Frame period (ms)
    • Allows you to set the air frame period duration (in ms). The value range is
    1
    • 2,
    2Requested
    • 4, 5 or 10 ms
      • A shorter frame period gives lower latency, but also has higher overheads
      • Using longer frame periods cuts down overheads, but increases the latency
  • Also, air frames higher than 2 ms allow using the link at higher distances

    • Downlink Quota

    (%)

    Allows you to set the desired
    • Actual downlink/uplink ratio values through specifying the downlink subframe period relative to the whole frame
    . The value range of the parameter is 10…90 in increments of 1
  • Actual downlink/uplink ratio might be different due to internal system limitations. The system chooses the closest available ratio automatically which can be checked in the Status page or by checking the output of the “xg capabilities” command
    • Max Distance (meters
    • Downlink Quota available values depend from:
      • Channel width
      • Short Cyclic prefix
      • Frame period
      • Max Distance
    Short Cyclic Prefix
    • Enable/disable short cyclic prefix option
    • Cyclic prefix is used to mitigate inter-symbol interference due to multipath propagation environment
    • Cyclic prefix size is always 1/8 for 10 MHz channel width
    Max Distance (km)
    • Allows you to specify the maximum link distance (in
    meters)
    • kilometers). The possible values: from 1 to 100 in increments of 1 km
    • The specified value must not be lower than the actual link distance, but it is recommended keep it as close as possible to the actual distance to avoid unnecessary overheads
    • The recommended strategy is to set this parameter well above the
    actual distance and fine-tune it to
    • actual distance
    plus 200-300 m
    • after the units have been deployed based on the measured distance value taken from
    “xg stat” output
    • “xginfo stat” output
    TDD Synchronization
    • Allows you to configure the TDD synchronization source:
      • “freerun” - the "slave" unit synchronization is performed with the built-in GPS/GLONASS receiver of the "master" unit
      • “gnss” - synchronization from built-in GPS/GLONASS receiver
    Note
    titleNOTE

    To ensure two Masters synchronization from the synchronization source:

    • The first Master must be set to "freerun" mode.
      The second Master must be set to "1588" mode.
    Control Block Boost
    • Enable/disable control block boost option
    • Control Block Boost improves link availability in the most difficult propagation and interference conditions due to the radio frame with control information transfer at duplicate transmit power
    Radio Frontend

    Downlink Center Frequency, MHz

    (5 GHz units)

    • Allows you to configure the frequency in MHz at which data will be transmitted
    • The frequency selection is automatically blocked when "Instant DFS" and "Automatic frequency selection" options are enabled

    Uplink Center Frequency, MHz

    (5 GHz units)

    • Allows you to configure the frequency in MHz at which data will be received
    • The frequency selection is automatically blocked when "Instant DFS" and "Automatic frequency selection" options are enabled

    Center Frequency, MHz

    (6 GHz units)

    • Allows you to configure the center frequency
    Maximal Transmit Power (dBm)
    • Allows you to configure the transmit power level (in dBm). The value range is 0…27 dBm in increments of 1 dBm
    Instant DFS
    • Enable/disable Instant DFS option
    Note
    titleNOTE

    The "Instant DFS" option is only available for the InfiLINK XG family 5 GHz devices.

    Automatic Frequency Change Timeout (s)
    • Not available in case of Instant DFS option disabled
    Automatic Frequency Selection
    • Selects the frequency when link is establishing, unlike the "Instant DFS" option, which scans the medium when data are already transmitted through the link
      • Is chozen automatically when the "Instant DFS" option is enabled. If the initial frequency selection is not required (link is already established), disable this function in order to prevent the radio disconnection.
    Note
    titleNOTE

    The "Automatic Frequency Selection" option is NOT available for the InfiLINK XG 1000 family devices.

    Automatic Modulation and Transmit Power Control
    AMC Strategy
    • Allows you to select the AMC algorithm strategy:
      • “conservative” assumes using higher CINR thresholds in order to minimize the error rate
      • “aggressive” lowers the thresholds in order to use higher modulation levels and thus increase the throughput
      • “normal” represents a balance between the error rate and throughput values
    Maximal  MCS
    • Allows you to configure the maximum MCS that can be used:
      • QPSK 1/2
      • QPSK 3/4
      • QAM16 1/2
      • QAM16 3/4
      • QAM64 4/6
      • QAM64 5/6
      • QAM256 6/8
      • QAM256 7/8
      • QAM256 30/32
      • QAM1024 8/10
    Automatic Transmit Power Control
    • ATPC Master
      • The master unit manages the transmit power of the remote unit in order to achieve the target RSSI value of its own receiver
    • ATPC Slave
      • The slave unit corrects the transmit power of its own transmitter according to the master unit directions
    • In general "ATPC Master" and "ATPC Slave" are not related to the "master" and "slave" parameters. The same unit can be as "ATPC Master" and "ATPC Slave"
    Target RSSI (dBm)The RSSI target value:
    • The RSSI value of the master tries to engage the target range, the center value of which is the "Target RSSI"
    • Practical range: from -20 to -70 dBm (the actual: from -40 to -70 dBm)
    Note
    titleNOTE

    For the InfiLINK XG 1000 family models the following parameters can be configured for both radio modules:

    • DL Center Frequency
    • UL Center Frequency.

    The minimum required guard interval between center frequencies of "Carrier 0" (the first radio module) and "Carrier 1" (the second radio module) should be:

    • 20 MHz - for 10 MHz channel width
    • 40 MHz - for 20 MHz channel width
    • 80 MHz - for 40 MHz channel width.
    Center
    Scroll Title
    titleFigure - InfiLINK XG 1000 Radio Settings section

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    Warning
    titleCAUTION

     Setting  Setting the source of synchronization takes effect only for the Master unit.

    Warning
    titleCAUTION

     Make sure that the built-in GNSS receiver is set up before enabling the “gnss” “gnss” option (use “gps” command to check the status - it is recommended to use values of “HDOP” parameter up to 1.5 for reliable global timing synchronization).

    Warning
    titleCAUTION

     Please note that the following settings must be equal for the co-located units:

    • Channel width
    • Maximal distance
    • Air frame period
    • Downlink/uplink ratio
    • All co-located units must be Master units

    ...

    "master" and "slave" unit to establish the radio link:

    • Center Frequency
    • Channel Width
    • Frame Period
    • Short Cyclic Prefix
    • Link ID
    Note
    titleNOTE

     In order to export and apply option markedImage Addedto the other side of the link check the box "Export settings markedImage Addedto the other unit" and click the "Apply" button.

    Note
    titleNOTE

    Safety apply settings mode is activated by default on devices. Mode principle of work is detailed described in the document "Safety apply settings in InfiLINK XG / InfiLINK XG 1000".

    Frequency Channel Grid

    The licensed frequencies range per each bandwidth is displayed in the “Default Frequency LimitationChannel Grids” fields:

    • For 10 MHz bandwidth: value range between 49056295...5995 6405 MHz in increments of 10 MHz
    • For 20 MHz bandwidth: value range between 49106300...5990 6400 MHz in increments of 20 MHz
    • For 40 MHz bandwidth: value range between 49206300...5980 6400 MHz in increments of 20 MHz
    Center
    Scroll Title
    titleFigure - Default

    ...

    Channel Grids

    ...

    Image Added

    Changes to these default values can be performed in the “Custom Frequency Grid” "Customer Channel Grid" fields, whre where you can:

    • Limit the licensed frequencies range per each bandwidth
    • Change the center frequency step (for example, 49506295-59006405/2.5 means that the step between the center frequencies from 4950 GHz and 5900 GHz 6295 MHz and 6405 MHz is 2.5 MHz):
    Center
    Image Removed
    Scroll Title
    titleFigure - Custom frequency grids
    Customer Channel Grid

    Image Added

    The step must be >= 1 MHz and the frequencies range (determined by the license) cannot be exceeded.