Base and repeater installation and important notes

Base can be wall mounted with screws or with special bracket (bracket is not part of standard packet, should be separately ordered).

The distance between a base and a repeater or another base must not less than 3m, same for the distance to other vendor DECT devices.

Do not mount base directly on metal, It will generate radio interference and bad performance, please don't forget that some materials can stop signal (metalized glass), It is really important to make a coverage test.

Always mount base or repeater with top upside when install on celling to get DECT coverage 360° horizontal.
Always keep Avoid signal strength “RSSI” below -75dBm among bases or repeaters (risk for units loses DECT sync leading to bad audio and roaming/handover issues).

Please don't forget that in areas with heavy call load, you should place several bases to increase the call capacity: each base handles up to max. 8 calls.

Please also consider to use more than one bases in order to provide coverage redundancy avoiding single point of failures.

For power continuity use POE adaptor or a PoE switch with stable current supply.
Repeaters can be used in chain to extend DECT range in corridors and areas with less capacity need, is important to consider that a repeater can handle up to 5 simultaneous calls.

Generic concepts

  • When the muticell is set-up all the settings are automatically synchronised across all the bases, how the sync mechanism works depends mainly on how the Data Sync in configured:
    • multicast: if you are using multicast you can change one or more settings on every base of the system, all the changes will be propagated automatically over all the bases. In this situation you should avoid to work on more than one base at the same time
    • peer-to-peer: in case the system is set using peer-to-peer you must change the settings on the Primary data sync DECT cell. changing a setting on another base will not trigger a setting synchronisation
  • Multi master should be avoided except for some very specific situation
  • In production the DECT tree should be calculated automatically by the system in order to offer the best coverage and redoundancy

Step-by-step guide

The deployment can be divided in three phases

  1. Bases deployment
  2. System installation
  3. Site survey

Bases deployment

This first phase is important in order to determine the bases position ensuring a proper signal coverage. This task can be accomplished using one base and one handset:

  1. Turn on one base, the base must be resetted to default values, network connection (DHCP, etc.. ) is not needed for this step
  2. Once the base is booted you should position one handset close to the base (~1m)
  3. On the handset activate the discovery menu pressing the keys [Menu]*47*
  4. Now the handset will display the base MAC address (in case you are close to more than one base please select the correct MAC)
    The discovery menu
  5. After selecting the base the handset will display the signal attenuation into the RSSI field. Now you can press the offhook key to get an audio loopback to the base, pressing the center key in offhook mode the handset will generate a continuos tone.
    At this point you can walk around the base and measure the coverage quality.
  6. Place the next base when the signal reduction reaches the value of 75dBm. Important: values bigger than 75dBm (80, 85,..) will lead to call quality issues and DECT synchronisation problems,
  7. Areas requiring extended call capacity will require more base station.

Is important to perform the measurement with the base placed into the definitive position: moving a base after the measurement will invalidate the measure.

System Installation

Once the position of the bases is identified trough the previous step you can proceed installing the system. Hereby the steps to follow:

  1. Start from one base:
    • Update the firmware to the latest version
    • Configure the NTP server and the proper region / time-zone
    • Configure the SIP server
    • Configure at least one SIP account
    • Enable the multicell
    • Configure the data-sync more properly (peer-to-peer or multicast)
    • Reboot the base
  2. Once the base is rebooted you should see the status "Ready to join as Primary" in the device home page
  3. Setup the second base:
    • Make sure the base is resetted to default values
    • Update the firmware to the latest version
    • Configure the NTP server and the proper region / time-zone
    • Enable the multicell
    • Configure the data-sync more properly (peer-to-peer or multicast)
    • Reboot the base
  4. After the base reboot the base should join the system, this can take up to 15-20 minutes
  5. Install all the bases in the same way of the second one
  6. Register the handsets to the system

If a base doesn't join the system please look at the following articles:

Site Survey

When all the bases are mounted and online are coverage and handover must be tested using an handset in site survey mode.

  1. Take one handset registered to the system
  2. From the handset place a call, better will be to have a service playing a continuous message. Is important to have an active call during the site survey for the following reasons:
    - you can verify that the call remains active during the test
    - the site survey menu (see the next point) will be refreshed more frequently and will be more accurate
  3. Activate the site survey menu pressing the keys [Menu]*789872* (same keys combination to disable).
  4. The site survey menu will display an overlaying area on the top of the handset display showing the following informations:

    The RPN identifying the bases that the handset can "see"
    First on the left is the base where the handset is locket to
    The signal attenuation related to the above RPN
    Frame errors for the portable part (the handset) and the fixed part. Typically this value increase with RSSI values below -75dBm
    Is the codec used for the DECT transmission, will display g726 for narrowband calls and g722 for HD calls
    1st. column represents the number of free DECT channels, the 2nd. is the number of disturbed channels, 3rd. value is the amount of highly disturbed channels, the 4rd one is the non-available channels. Having low values on the first column means heavy DECT interferences that can lead to audio issue and range reduction.
  5. Using such menu you can walk around the area and verify the handover, call quality and the number of bases the handset can reach.

In order to guarantee a good redundancy is important that the handset lists at least 3 bases with good dBm values (minor than -75).