User`s manual

PAGE 3
Technical support [phone] www.digi.com
XPress Ethernet BridgeUser’s Manual
Operational Summary
The XPress Ethernet Bridge allows the user to create a long-range, wireless Ethernet network
with up to 16 active (63 total) subscriber units per access point.
Conguring a wireless link with the XPress requires the establishment of six elements:
• Each radio must know whether it is to be an access point (AP) or subscriber unit (SU).
• Each radio must have an IP address that is unique among all others on the same
network.
• The AP must know how many SUs are expecting communication with it.
• The AP and any given SU must agree on which radio frequency channel they are using.
This can be manually set or allowed to change automatically.
• The SU must be assigned a unique subscriber ID to specify which time division slot it
will use when communicating with the AP.
• The AP and any given SU must share a common 128-bit encryption key.
The access point (AP) automatically scans for the best of the 12 available radio frequency
channels, encrypts Ethernet data received from the network, and transmits it wirelessly to the
correct subscriber unit (SU). The AP is constantly monitoring the radio link and can automati-
cally change the channel if performance is degraded due to interference. If two AP units are
very close to one another, they may interfere if operating on adjacent frequency channels.
Place them at least 10 feet apart or manually select non-adjacent channels for their opera-
tion. Also, the SU should be placed at least 10 feet from the AP to avoid overloading the radio’s
receiver.
Any 10/100 BaseT Ethernet client device (ECD) can be connected to an XPress subscriber unit.
Each SU encrypts Ethernet trafc received from the attached ECD and transmits the data
wirelessly to its AP. Each SU can be plugged directly into an ECD without adding drivers or
loading software. Essentially, once the AP/SU pair is congured and running it behaves like a
continuous Ethernet cable.
XEB09-CISA(-W):
• One XEB RF Modem (“-W” = International variant)
• One 2.1 dBi Weatherproof Dipole Antenna
• One 12 VDC Power Supply
• One Power over Ethernet Injector
XEB09-CIPA(-W):
• Two each of the items above
(Ethernet cables are not included.)
Contents