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E Series Ethernet Radio – User Manual
Version 08-10
Power Supply
Operating Voltage Range
The ER45e Device will operate between a DC Voltage Range of 10 - 30V (13.8VDC Nominal). if the operating voltage is exceeded the E series
Ethernet remote will self protect by opening its internal fuse.
The EB/EH45e models operate between 11-16VDC (13.8VDC Nominal).
Reverse Polarity Protection
The internal power supply circuitry of the ER45e has an in series diode. The fuse will not blow if reverse voltage is applied that is <= 30V DC.
The EB/EH45e models DO NOT have reverse polarity protection, if reverse polarity is applied the units fuse will blow.
Over Voltage Protection
The E Series Ethernet radios have an internal transorb that will protect the device from short term transients and may blow the fuse depending on
the duration and magnitude of the transient signal.
Ethernet
Static & DHCP Addressing
The E Series Ethernet radio range gives you the choice of IP allocation, via either Static or Dynamic (DHCP) IP address allocation. The choice of
which to use will normally depend on the network you are integrating the radio into or the type of application you are trying to use the radio for.
Most large corporate environments utilize the DHCP method where a DHCP server dynamically assigns an IP address when requested to devices
connected to its network. This allows for very large networks to be managed very easily without the need for complex IP address tables to be
maintained.
Static IP address allocation is used in smaller environments or where the application being used requires a constant IP address for correct operation.
The type of IP allocation should be discussed with your network administrator is connecting to an existing network or decided in the network design
phase to ensure correct operation.
Unicast/Broadcast Filtering
This feature greatly improves the available bandwidth in systems where peer to peer connectivity is required. The filtering is implemented within the
Access Point (or Bridge) of PTMP systems. Essentially it prevents the unnecessary repeating of Ethernet traffic which is inherently point to point in
nature (ie: a TCP session).
When two remote radios need to communicate with each other (often referred to as Peer to Peer), the Access Point (or Bridge) will repeat the traffic
to provide peer to peer connectivity.
However, if the traffic is from a Remote to an AP (or Bridge), then peer to peer repeating is not required and the AP (or Bridge) does not repeat the
traffic. The AP (or Bridge) learns what devices (MAC addresses) do not require repeating. Broadcast traffic is always repeated. By learning where
devices are located on the network, the route table does not require any special configuration or setup.
Part D – Features
