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This article explains how you can add redundancy in your DECT multi-cell system, it can be split in:

  • Base stations level 2 - 15
  • Base station level 1 (New in 2.29 or higher)
  • DECT manager (Planned)
  • Integrator 
Base stations level 2 - 15 redundancy

The N870 base-stations synchronised via DECT will automatically synchronize with a higher sync level. Base stations can and will skip a higher sync level if it can connect to an even higher sync level.

If you look at the picture, you can see that the base with level 3 will skip level 2, if level 1 can be seen with a good quality.

No redundancy:

The Base with level 3 can only see the base with level 2 and if the base with level 2 is down then also the level 3 base will be down. If more bases connect to this level 2 or 3 then also these bases will not be functional.

How to add redundancy:

To place the base stations more close to each other. In the example, the base with level 3 can see level 2 and level 1. 

  • Base with level 3 will automatically connect to level 1 if the quality is good enough
  • If Level 2 is down then level 3 will still work as it can also connect to level 1
  • The calls for the base with level 2 that is down will be handled by the level 1 and 3 (Capacity has to be calculated)  

When the system is using LAN synchronisation then all Bases will connect to the LAN Master which is the level 1 base (mostly), then the next chapter "Level 1 redundancy" must be used to add redundancy.

Base station level 1 redundancy

If the base station with level 1 is down then the complete DECT multi-cell system will be down and no calls are possible.

For this in software 2.29.0 or higher a new feature is implemented.

You can add an extra DECT base station and enable the option "Act as Sync Master redundancy"

This setting can be changed go to: SETTINGS - BASE stations - Administration and Edit the base - Act as Sync Master redundancy

When enabled:

  • DECT base will get sync level 2→1
  • DECT base can handle calls like every other base
  • If level 1 goes down, it will take over the role of level 1
    • DECT level 1
    • LAN Master if enabled
  • It will take 10 minutes before the device takes over the level 1 (Time can not be changed)
  • If level 1 comes back then it will be switched automatic to level 2→1 and will be the redundant base

If the level 1 is down, then for at least 10 minutes no calls are possible. After 10 minutes the redundant base will take over the level 1 role and the system will synchronize and handsets will connect. It will take some time before synchronization is ready and all handsets are connected again.


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