User's Manual

8 EMG101 Gateway
2.3 EMG101 Gateway Placement
For optimal performance, install the EMG101 Gateway away from transformers, heavy-duty motors, fluorescent
lights, microwave ovens, refrigerators and other industrial equipment. Signal loss can occur when metal, concrete,
walls or floors block transmission. Install the EMG101 Gateway in an open area or add additional gateways as
needed to improve coverage.
Antenna coverage is analogous to lighting. Users might find an area lit from far away to be not bright enough. An
area lit sharply might minimize coverage and create dark areas. Uniform antenna placement in an area (like even
placement of a light bulb) provides even, efficient coverage.
Place the EMG101 Gateway using the following guidelines:
• Install the EMG101 Gateway at an ideal height of 10 feet from the ground.
• Orient the EMG101 Gateway antennas (Part Number ML-2452-APA2-01) vertically for best reception.
• Point the EMG101 Gateway antennas downward if attaching to the ceiling.
To maximize the EMG101 Gateway’s radio coverage area, Symbol recommends conducting a site survey to define
and document radio interference obstacles before installing the EMG101 Gateway.
2.4 Power Injector System
The EMG101 Gateway can receive power via an Ethernet cable connected to the GE1/PoE port.
When users purchase an Electronic Shelf Label (ESL) solution, they often need to place EMG101 Gateways in
obscure locations. Power can be supplied from a dedicated connection or from a PoE injector. The Power Injector
merges power and Ethernet into one cable, reducing the burden of installation and allowing optimal EMG101
Gateway placement in respect to the intended coverage area.
The Power Injector (Part No. AP-PSBIAS-2P2-AFR) is an 802.3af PoE injector. The EMG101 Gateway can only use a
Power Injector when connecting to the EMG101 Gateway’s GE1/PoE port. The Power Injector is separately ordered
and not shipped with the EMG101 Gateway. A separate Power Injector is required for each EMG101 Gateway
comprising the network.
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