Eion LibraPlus 5845, Руководство пользователя, Страница: 19 / 140

• LibraPlus CPE. The CPE is the main piece of equipment that would normally be installed out-
doors (indoor installation is permitted when feasible) The CPE contains all of the necessary radio
equipment to provide a high-speed wireless link. The CPE also has an integral antenna such that no
RF cables are required for a typical installation.
• Ethernet Power Inserter. This piece of equipment is a small box that connects between the
CPE and the P.C. This box also provides power for the CPE equipment to run. A CAT-5 outdoor
cable is used to connect the Power Inserter to the CPE. The weatherproofing kit is used with standard
RJ-45 connector to ensure reliable connection for outdoor systems.
Wireless network activity focuses on the AP, which is both the main access point to the Ethernet (LAN
or WAN) and the destination for CPE-originated communications (CPEs do not communicate directly
with other CPEs—they communicate only via the AP). CPEs complete the customer-end of a wireless
link.
2.1.4.5. Long Range Customer Premise Equipment (LCPE)
The LCPE equipment also connects customers to the AP via a wireless link. The LCPE enables the
customer to reach longer ranges by allowing the connection to a higher gain external antenna. It can
also be used for indoor installation of the units should severe weather conditions require it. The antenna
is then mounted outdoors and connected via appropriate RF cables to the unit. One other alternative
which customers may want to consider is to use lower gain antennas with systems that are very close
to the Base Station to mitigate some interference concerns without recourse to dynamic power control.
The LibraPlus LCPE consists of three parts: 1) LCPE, 2) Ethernet Power Inserter with CAT-5 cable
(bought separately) and weatherproofing kit (included), and 3) the External Antenna and cable (both
bought separately).
• LibraPlus LCPE. The LCPE is the main piece of equipment. It is designed for outdoor installation
but can also be installed indoors if needed. The LCPE is equipped with an N-type connector so that
the external antenna can be connected to it. Thus the range of the P-MP system can be significantly
increased by use of higher gain antennas. Also, in situations where very severe conditions may be
encountered outdoors the LCPE can be installed indoors with cabling to the antenna outside.
• Ethernet Power Inserter. This piece of equipment is a small box that connects between the
LCPE and the P.C. This box also provides power for the LCPE equipment to run. A CAT-5 outdoor
cable is used to connect the Power inserter to the LCPE. The weatherproofing kit is used with
standard RJ-45 connector to ensure reliable connection for outdoor systems.
• Antenna and Cable. In order to accomodate different range requirements for P-MP links, the
LCPE is designed to be used with an external antenna. Antennas and cables are selected by the user
based on the network requirements.
2.1.4.6. Radio Operation Background
The LibraPlus communicates using a technique call Time Division Duplexing (TDD) in both the P-P
and P-MP configurations. TDD uses one frequency for both the Down Link (DL) Transmission (Base
to Remote in P-P, or AP to CPEs in P-MP), and for the Up Link (UL) (Remote to Base in PP or CPEs
to AP in P-MP). The DL and UL transmissions are performed at different times, therefore the system
is known as a Time Division Duplexing system. The available frequency band is therefore separated
into multiple TDD channels allowing for use of the whole frequency bands for very high capacity.
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Description