Ceragon FA4800, Руководство пользователя

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A Little Terminology Chapter 1
FA4800 User Manual Release 1.9.30 1-17
The site which is closer to the network core (often the local site) will be
referred to as
site A
, and the opposite side of the link, usually closer to the
end user, as
site B
.
This choice is application-neutral and will be used throughout the manual
both to describe the sites and their names as in the examples.
The link is configured and managed using a PC, the
managing computer
connected to site A. (The precise requirements for the managing computer
are set out on
page 4-1 ).
We will occasionally need to distinguish between the site to which the man-
aging computer is connected, and the second site, when they are not nec-
essarily A or B. The former will be called the
managing site
and the latter,
the
over-the-air site
. Which is which, is always determined by the loca-
tion of the managing computer.
FA4800 supports three connection methods for the managing computer:
•
Local
- a direct peer to peer connection between the Ethernet ports
on the managing computer and the IDU or PoE device. Local con-
nection is always read-write.
•
Network
- the managing computer and the site A IDU or PoE
device belong to a LAN and communicate through a router or switch
• Over-the-air - the managing computer connects to site B via the
air interface
• The managing computer may be connected to the link through an
IDU or a PoE device. In what follows, where ever we refer to an IDU
it includes PoE devices unless stated otherwise. Typically, if we need
to refer to an IDU as such, we will use a model name such as IDU-C.
The terms uplink and downlink, originate from the field of Satellite com-
munications. In a backhaul or ISP context, uplink is from the user to the
network and downlink is from the network to the user.