GE MDS SD Series Technical Manual page 53

MDS 05-4846A01, Rev. H
• Provides the possibility for Frequency Re-use. SysID
System ID—
offers nine unique choices including the default value of
The setting
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MDS legacy and SDx products. SDx-only networks can utilize
the Frequency Re-use feature by setting the System ID to a com-
mon value [ ] for all radios in a specific network. SysID (or Sys-
1-8
tem ID as it is referred to in the Device Manager) offers
approximately 20 dB of additional co-channel isolation when
operating networks on the same frequency. Note that proper sys-
tem design is required.
Operational Example: SDx System "Alpha" has eight units and
SDx System "Beta" has eight units. A user wishes to occupy fre-
quency 952.1235 MHz on both of these systems. Proper system
installation has been adhered to in both networks. System Alpha's
units would all be set to
be set to
System ID = 5
desired frequency.
Examples of valid and invalid arrangements are shown Figure 28
and Figure 29, respectively.
NOTE: All radio sites must adhere to proper RF installation tech-
niques. This is especially important for System ID arrange-
ments. Contact your factory representative if additional
guidance is required.
Figure 28. System ID Example—Valid Arrangement
SD Series Technical Manual
is required for mixed networks comprised of
, System Beta's units would
System ID = 1
. Both systems will now operate on the same
Invisible place holder
.
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