System Feature Overview 7
68007024085 April 2011
2.1.2.3 Two-Slot TDMA Reduces Infrastructure Equipment
As we have seen, two-slot TDMA essentially doubles repeater capacity. This means that one
MOTOTRBO repeater does the work of two analog repeaters (a MOTOTRBO repeater supports
two calls simultaneously). This saves costs of repeater hardware and maintenance, and also
saves on the cost and complexity of RF combining equipment necessary in multi-channel
configurations. Just as importantly, the two-slot TDMA signal fits cleanly into a customer’s existing,
licensed channels; there is no need to obtain new licenses for the increase in repeater capacity,
and compared to alternative technologies that may operate on different bandwidths, there is no
comparative increase in the risk of interference with or from adjacent channels.
Figure 2-3 MOTOTRBO Requires Less Combining Equipment
Tx1
Rx1
Tx2
Rx2
Tx3
Rx3
Repeater 1
12.5kHz Analog
Repeater 2
Repeater 3
Combining
Equipment
Frequency Pair 2
Groups
Frequency Pair 1
Analog 2-Channel System
Repeater
Tx
Rx
12.5kHz TDMA
MOTOTRBO 2-Channel System
Duplexer
Frequency Pair
Groups
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