Introduction Understanding System and Coverage Limits
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ShoreTel IP Phone 930D Planning and Installation Guide 13
Understanding System and Coverage Limits
The capacity of the IP930D system is limited by the number of DECT radio channels available in close
proximity to the bases and repeaters.
Frequency Bands
The IP930D system uses these frequency bands:
1920 - 1930 MHz (US)
1880 - 1900 MHz (Europe, Australia, New Zealand)
System Capacities
Each base station and each repeater uses a 12-timeslot DECT radio.
In the US and Canada (US/CA), there are 5 frequencies available for voice: 5 x 12 timeslots = 60
channels maximum.
In Europe, Australia, and New Zealand (EU/ANZ), there are 10 frequencies available for voice: 10 x 12
timeslots = 120 channels maximum.
Each base station can support a maximum of 4 handsets.
Each base can, optionally, support up to 4 repeaters. Adding repeaters does not increase the number
of handsets that a base can support; it only extends the range, or footprint, that those handsets can
roam.
You can daisy chain/cascade repeaters up to a maximum of three (although doing so may introduce
delays).
Capacities (US/CA):
With 1 base and 0 repeaters = 4 handsets
With 10 bases and 0 repeaters = 40 handsets
Maximum combined base units and repeater units = 24 handsets (average)
Capacities (EU/ANZ):
With 1 base and 0 repeaters = 4 handsets
With 20 bases and 0 repeaters = 80 handsets
Maximum combined base units and repeater units = 48 handsets (average)
Capacities are limited to these maximums to ensure that all handsets can be guaranteed non-blocking
voice paths—even when all handsets are on a three-party call.
Note that these IP930D system capacities refer to a single site or airspace within which the handsets
are used; a single ShoreTel system can support multiple IP930D systems in different locations, so long
as there is no airspace contention between them.
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