
PRODUCT OVERVIEW
General Description
2.10
•
19.01.2007
9
Comparison of both protocols:
Characteristic
Connection based
Packet based (CLDPS)
Networking capability
no
1
yes, 64 active subscribers per
radio cell (= base station)
TCP/IP capability
no
yes
Data rate
2x26 kBit/s for up/downlink,
synchronous
up to 500 kBit/s per radio cell,
asynchronous
Symmetry up/downlink
symmetrical
asymmetrical, dynamical
Occupied DECT channels
1 duplex
12 duplex per radio cell
Real-time capabilities
data are transferred in fixed 10 ms
time frame
allocation of timeslots by base
station,
not collision-based,
9 traffic slots per 10ms time
frame,
undetermined behaviour with
increasing number of
subsribers and amount of data
Voice transmission
yes, between FT and one PT, input
via microphone, output to
loudspeaker at the other side
no
2
The FHSS protocol stack of the HW 86022 further additionally includes the MAC layer
procedures related to frequency hopping which is required for operation in the 2.4 GHz ISM
band.
Moreover the firmware includes full interworking with the RS-232 interface.
Note:
Earlier firmware versions supported a high-speed point-to-point mode. Due to the
development of CLDPS Höft & Wessel devices will no longer support this mode.
1
present 1:4 protocol mode further supported but not recommend for new projects.
2
packet based voice transmission possible