Master Station Configuration; Antenna System For Co-Located Master Stations - GE TransNET 900 Reference Manual

in order to reduce the interference to the point where overload of one network
by the other will not occur. The
this antenna separation requirement by operating the networks in a TDD
mode and ensuring that one Master cannot transmit while the other (or
multiple others) are trying to receive a signal from a distant radio.

Master Station Configuration

On all Masters for which you wish to synchronize transmissions, establish
one Master as the "Clock-Sync Master by setting its
Network Address (
values to the Network Address (
CSADDR
Make sure that you use a different Network Address (
This value will be used to identify all units associated with this Master's
network.
Note that all Masters must be set to the same
where the CSADDR
CSADDR = ADDR
CSADDR  ADDR
CSADDR = NONE
, and
HOPTIME FEC
dependent units.
NOTE: If a Dependent Master station is unable to find the Clock-Sync Master station, it
will not be able to operate properly and the associated network will be
out-of-service.

Antenna System for Co-Located Master Stations

Using this TDD (Clock-Sync) mode will prevent any two Masters from trans-
mitting and receiving at the same time and greatly reduce the antenna separa-
tion requirements to near zero. Under this arrangement, the antennas of
co-located Masters may be placed a few feet (less than a meter) apart horizon-
tally, or just above or below vertically with no ill effects. There are two
common antenna system arrangements:
Sharing a Common Antenna System
It is possible to share an antenna between multiple Masters using stan-
dard power dividers, as long as the extra loss associated with these
devices is taken into account in your RF budgeting process. Masters in
this configuration must be operating with Clock-Sync (
enabled.
Ideally, co-located Masters should use separate antennas. They can
share an antenna only if isolation is sufficient. If sufficient isolation is
not guaranteed, degraded performance will result. For example, the two
Master stations shown in
mon antenna system. They use a power-divider that will result in a sig-
nal loss of 3 dB, or one-half power level, on both transmit and receive
signals.
The power divider, such as a Mini-Circuits ZAPD-1 or similar product,
64 MDS TransNET Ref. Manual
CSADDR
). Then, set all other dependent Masters
ADDR xxxxx
matches its own
—Unit serving as a Clock-Sync Master
—Unit serves as a Dependent Master (Clock Slave)
—Co-located Master feature disabled (default)
values are provided by the Clock-Sync Master to all
SAF
Figure 20 on Page 65
command will provide relief from
CSADDR
) of the Clock-Sync Master.
ADDR
ADDR
CSADDR
ADDR ; this is the Clock-Sync Master.
are connected to a com-
MDS 05-2708A01, Rev. F
value to it own
) for each Master.
setting, but only one
)
CSADDR