Product Architecture
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4 Product Architecture
The PTP 500 Series Bridge consists of an identical pair of units deployed one at each end of the
link. The radio link operates on a single frequency channel in each direction using Time Division
Duplex (TDD). One unit is deployed as a master and the other as a slave. The master unit takes
responsibility for controlling the link in both directions. The non-line-of-sight (NLOS) aspects of
the product are provided by Multiple-Input Multiple-Output (MIMO), coupled with Orthogonal
Frequency Division Multiplexing (OFDM) modulation.
The PTP 500 Series Bridge has been developed to operate within license exempt frequency bands.
The current product range supports:
•
ETSI 5.4 GHz band B (5.470-5.725 GHz)
•
ETSI 5.8 GHz band C (5.725-5.850 GHz) and the USA 5 GHz ISM band (5.725-5.850 GHz)
The PTP 500 Series Bridge has been designed to coexist with other users of the band in an
optimal fashion using a combination of Transmit Power Control (TPC), Spectrum Management
functionality and Antenna beam shape.
In order to maintain link availability, the product employs adaptive modulation techniques that
dynamically reduce the data rate in severe or adverse conditions. The PTP 500 series provides
wireless Ethernet bridging between two fixed locations. To be more precise, it forwards Ethernet
frames as a two-port transparent heterogeneous encapsulation bridge, meaning that each bridge
forwards frames between two dissimilar interfaces (Ethernet and wireless), encapsulating Ethernet
MAC frames within a PTP MAC frames for transmission at the wireless interface. A link consisting
of a pair of back to back bridges appears to the data network to be very similar to a standard
two-port Ethernet bridge.
The PTP500 series provides two egress queues in each direction, classifying Ethernet frames into
one of the two prioritised queues based on inspection of the user priority field (802.1p) in the
IEEE802.1Q VLAN tag.
Untagged frames receive a default priority.
The queuing method is
strict priority. The bridge does not implement any VLAN functions for bridged frames apart from
inspection of the priority field, and consequently the bridge forwards tagged and untagged Ethernet
frames regardless of VLAN ID and without modification of any protocol header fields..
The management function of the PTP 500 Series Bridge is logically equivalent to a separate protocol
stack with virtual point of attachment at the Ethernet interface. This is illustrated in
.
Содержание MOTOWI 4
Страница 1: ...PTP 500 Series User Guide phn 1115 000v001 ...
Страница 74: ...Web Page Reference 74 Figure 37 Save Configuration File Screen ...
Страница 100: ...Web Page Reference 100 Figure 59 Spectrum Management as seen from the Master ...
Страница 108: ...Web Page Reference 108 Figure 66 Spectrum Management Master Screen With Operational Restrictions ...
Страница 112: ...Web Page Reference 112 Figure 68 Remote Management ...
Страница 165: ...Data Rate Calculations 165 Figure 112 QPSK 0 50 Single Payload Figure 113 QPSK 0 75 Single Payload ...
Страница 166: ...Data Rate Calculations 166 Figure 114 16 QAM 0 50 Single Payload Figure 115 16 QAM 0 75 Single Payload ...
Страница 167: ...Data Rate Calculations 167 Figure 116 64 QAM 0 67 Single Payload Figure 117 64 QAM 0 83 Single Payload ...
Страница 168: ...Data Rate Calculations 168 Figure 118 256 QAM 0 75 Single Payload Figure 119 QPSK 0 50 Dual Payload ...
Страница 169: ...Data Rate Calculations 169 Figure 120 QPSK 0 75 Dual Payload Figure 121 16 QAM 0 50 Dual Payload ...
Страница 170: ...Data Rate Calculations 170 Figure 122 16 QAM 0 75 Dual Payload Figure 123 64 QAM 0 67 Dual Payload ...
Страница 171: ...Data Rate Calculations 171 Figure 124 64 QAM 0 83 Dual Payload Figure 125 256 QAM 0 75 Dual Payload ...
Страница 197: ...Glossary 197 UTP Unshielded Twisted Pair VLAN Virtual Local Area Network ...
