System characteristics
30
Planning Aastra 400 DECT systems as of R1.0
syd-0457/1.0 – R1.0 – 10.2012
4. 4 Using repeaters (relays)
Repeaters are autonomous devices which increase the range of the DECT system.
When positioning a repeater you need to make sure not only that the coverage
ranges overlap but also that the repeater is mounted in the coverage range of one
radio unit and vice versa. Several repeaters can be allocated to one radio unit. Ring-
form (see Fig. 12) as well as other arrangements around a radio unit are possible.
Most repeaters operate in "Blind Slot mode" but are also compatible with the Zero-
Blind-Slot mode. As they receive and send, only 2 call connections are usually pos-
sible simultaneously on each repeater.
A radio unit supports a maximum of 8 simultaneous call connections via repeater
(SB-4+ only 4). Cascaded repeaters are not supported. However the handover be-
tween individual coverage ranges is guaranteed.
Fig. 12 Arrangement of repeaters around a radio unit
Even remote buildings can be covered with a repeater by using external antennas
with rectification.
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