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PTP 250 User Guide Data network planning
phn-2182_002v000
May 2011 2-21
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.