Cambium Networks PTP 250, User Manual

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PTP 250 User Guide Data network planning
phn-2510_002v000 (Mar 2012) 2-23
Data network planning
This section describes factors to be considered when planning PTP 250 data networks.
IP interface
Choose an IP address for the IP interface of the ODU management agent. The IP address
must be unique and valid for the connected network segment.
Ensure that the design of the data network permits bi-directional routing of IP datagrams
between network management systems and the ODUs. For example, ensure that the
gateway IP address identifies a router or other gateway that provides access to the rest of
the data network.
Back to back links
Do not use direct cabled connections between the data ports of two PoE power supplies.
Where two or more links are deployed in a chain, always use an Ethernet switch or router
to interconnect the links at a relay point.
‘Green Ethernet’ switches
Do not connect PTP 250 units to Ethernet networking products that control the level of the
transmitted Ethernet signal based on the measured length of the Ethernet link, for
example Green Ethernet products manufactured by D-Link Corporation. The Ethernet
interfaces in these networking products do not work correctly when connected directly to
the PoE power supply.