Site Planning
43
6.1.4
Definitions
The equipment capability is given in
,
(IP Mode) and Table
??
,
(TDM
Mode). Each table gives Link Loss Output Power and System Thresholds for PTP 500 Series
Bridge in all modulation modes for the channel bandwidth 15 MHz. Adaptive Modulation will
ensure that the highest throughput that can be achieved instantaneously will be obtained taking
account of propagation and interference. The calculation of Equation 3 needs to be performed
to judge whether a particular link can be installed. When the link has been installed, web pages
provide information about the link loss currently measured by the equipment both instantaneously
and averaged. The averaged value will require maximum seasonal fading to be added, and then
the radio reliability of the link can be computed.
For minimum error rates on TDM links the maximum modulation mode should be limited to
64QAM 0.75.
The values for (BPSK) are static receive sensitivity measurements. The other values are static
receive sensitivity measurements with an AMOD threshold applied. The AMOD threshold applied
is for a benign radio channel.
Sensitivity:
Sensitivity is defined as the combined receive input signal level on both horizontal
and vertical inputs that produces a Null Bit Error Ratio of 3x10
-7
.
Output Power:
The output power is for a centre channel in Region 1. The output power will be
reduced on the edge channels and may vary if different region codes are selected.
AMOD Threshold:
The AMOD threshold is the combined receive input signal level on both
horizontal and vertical inputs that results in the link consistently entering the receive modulation
mode under consideration as the signal level is increased.
System Threshold:
Thresholds for all modes except BPSK are for the relevant link optimization
AMOD thresholds. System threshold for BPSK is the RPSK receive sensitivity.
Max Link Loss:
The maximum link loss for each modulation mode is derived from the AMOD
threshold for that mode (sensitivity threshold for BPSK) and the maximum Region 1 centre channel
output power. The figures assume integral antennas with 23dBi (5.8 GHz and 5.4 GHz) gain are
used.
Summary of Contents for MOTOWI 4
Page 1: ...PTP 500 Series User Guide phn 1115 000v001 ...
Page 74: ...Web Page Reference 74 Figure 37 Save Configuration File Screen ...
Page 100: ...Web Page Reference 100 Figure 59 Spectrum Management as seen from the Master ...
Page 112: ...Web Page Reference 112 Figure 68 Remote Management ...
Page 197: ...Glossary 197 UTP Unshielded Twisted Pair VLAN Virtual Local Area Network ...
