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1.2.4 MDS P21 Protected Network (Redundant) Configuration
For mission-critical applications, GE MDS also offers the Protected Network Station. This radio incorpo-
rates two iNET Series transceivers, two power supplies, and a switchover logic board that automatically
selects between Transceiver A and Transceiver B as the active radio. Figure 1-2 shows a view of the pro-
tected chassis. For system-level information on this product, see publication 05-4161A01.
Invisible place holder
Figure 1-2. MDS P21 Protected Network Station
(Incorporates Two Transceivers, with Automatic Switchover)
1.3 Applications
The following sections provide illustrations of typical transceiver installations. This is meant as an overview
only. It is recommended that a network manager be involved in all installation planning activities.
1.3.1 Wireless LAN
The wireless LAN is the most common application of the transceiver. It consists of a central control station
(Access Point) and one or more associated Remote units, as shown in Figure 1-3 on Page 5. A LAN provides
communications between a central WAN/LAN and remote Ethernet segments. The operation of the radio
system is transparent to the computer equipment connected to the transceiver.
The Access Point is positioned at a location from which it can communicate with all of the Remote units in
the system. Commonly, this is a high location on top of a building or communications tower. Messages are
exchanged at the Ethernet level. This includes all types of IP traffic.
A Remote transceiver can only talk over-the-air to an Access Point unit (AP). Peer-to-peer communications
between Remotes can only take place indirectly via the AP. In the same fashion, an AP can only talk
over-the-air to associated Remote units. Exception: Two APs can communicate with each other
"off-the-air" through their Ethernet connectors using a common LAN/WAN.
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MDS iNET Series Reference Manual
05-2806A01, Rev. L
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