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all of the "node" radios downstream. Passive polling allows monitoring without interrupting
payload data transmission.
In order for PulseNET to discover SD Master Stations in the network, DLINK must be enabled
and properly configured. Refer to the section "Dlink" on Page 48 for information on how to
configure DLINK.
3.3 Redundant versus Non-redundant Operation
A redundant configuration means that the Master Station has two complete transceiver boards
and power supplies installed in the enclosure. In the event of a failure in the primary equipment,
the controlling logic switches to the stand-by unit. The stand-by transceiver board is constantly
operating and its operational readiness is monitored. However, the power amplifier in the stand-
by board is not operating when it is in stand-by mode.
In a non-redundant configuration, there is only one transceiver board installed in the enclosure,
and back-up transceiver board operation is not possible.
Transceiver boards may be moved from one Master Station to another; however an additional
transceiver board cannot be added to a non-redundant Master Station. Redundant or non-
redundant operation is automatically detected by the platform manager, and the active
transceiver is automatically selected. Installing or replacing a transceiver board causes the board
to communicate briefly with the Platform Manager to establish which transceiver board will
operate as the active board and which operates as the stand-by. For more information, refer to
section 8.4 Replacing Modules on Page 116.
When redundant power supplies are present, both supplies are actively operating; meaning there
is no concept of an active vs stand-by power supply. If the system detects a loss of power on one
of the power supplies, an alarm will be generated until power is restored.
3.4 Antennas and Feedlines
Antennas
The Master Station may be used with a number of different antennas. The exact style and gain
factor depend on the physical size and layout of your system. Antennas of this type are available
from several manufacturers, including GE MDS. Contact your factory representative for details.
Connection is made to the station via N coaxial connectors at the rear panel.
Feedlines
The selection of an antenna feedline is very important. Poor quality cable should be avoided, as it
will result in power losses that may reduce the range and reliability of the radio system.
The tables that follow show the approximate losses that will occur when using various lengths
and types of coaxial cable in the 400 and 900 MHz bands, respectively. Regardless of the type
used, the cable should be kept as short as possible to minimize signal loss.
MDS™ Master Station
MDS 05-6399A01, Rev. F
19
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