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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. This product features
Multiple-Input Multiple-Output (MIMO) technology as well as Orthogonal Frequency Division
Multiplexing (OFDM) modulation, hence enabling a robust link to be achieved in a non-line-of-
sight (NLOS) environment.
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)
•
USA/Canada UNII Band (5.470-5.725GHz)
•
ETSI 5.8 GHz band C (5.725-5.875 GHz)
•
USA/Canada 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 switches to a more robust
modulation mode 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 and fragments of de-
prioritised Ethernet MAC frames within 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 as a
standard two-port Ethernet bridge.
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4 Product Architecture
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