PTP 450 Configuration and User Guide
Wireless operation
1-20
pmp-0815 (August 2015)
Product Parameter
Performance Details
1x
2x
4x
6x
8x
5 MHz
Channel:
(up+down)
3.6GHz
Nominal
Per-Chain
Receive
BHS RX
Sensitivity
(including
FEC)
‡‡
20 MHz
Channel
-85 dBm
-85 dBm
-79 dBm
-72 dBm
-64 dBm
10 MHz
Channel
-89 dBm
-89 dBm
-82 dBm
-75 dBm
-67 dBm
7 MHz
Channel
-90 dBm
-90 dBm
-83 dBm
-76 dBm
-69 dBm
5 MHz
Channel
-92 dBm
-92 dBm
-85 dBm
-77 dBm
-72 dBm
Link
Budget,
Integrated
(dB)
20 MHz
Channel
125.8
122.8
116.8
109.8
100
10 MHz
Channel
129.9
126.9
119.9
113
103.3
7 MHz
Channel
131
128
121.4
114
105
5 MHz
Channel
133
130
123
115
108
Adaptive modulation
PTP 450 units can transport data over the wireless link using a number of different
modulation modes. The radio automatically selects QPSK (Quadrature Phase Shift Keying)
- QPSK-MIMO-B and MIMO-A, 16-QAM (Quadrature Amplitude Modulation) - MIMO-B and
MIMO-A, 64-QAM - MIMO-B and MIMO-A or 256-QAM - MIMO-B and MIMO-A based on
the RF environment to provide 1x, 2x, 3x, 4x, 6x and 8x operation.
MIMO
Multiple-Input Multiple-Output (MIMO) techniques provide protection against fading and
increase the probability that the receiver decodes a usable signal. When the effects of
MIMO are combined with those of OFDM techniques and a high link budget, there is a
high probability of a robust connection over a non-line-of-sight path.
The sub-features that comprises the MIMO techniques utilized in the PTP 450 product are:
Matrix A: This technique enables the PTP 450 radio to use a scheme that tries to
optimize coverage by transmitting the same data over both antennas. This redundancy
improves the signal to noise ratio at the receiver making it more robust, at the cost of
throughput.
‡‡
PTP 450 devices include a dual polar antenna; Channel A (-45 deg.) and Channel B (+45 deg.).
Listed receive sensitivity corresponds to single-channel readings.
