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Exalt Communications, Inc.
r-series
Installation and Management Manual
5000007 (ETSI)
7
2007-02-12 (draft)
•
Impact on throughput and latency relative to link distance, occupied bandwidth, and TDD
frame size setting, and the planned implementation of these parameters
Familiarization with the r-Series
The r-Series utilizes time division duplex (TDD) radio transmission. This means that the
transmitted signal in both directions uses the same center frequency and transmits in one
direction for a period of time, and then in the opposite direction for another period of time. This
total period of time is referred to as the
frame length
or
TDD frame length
, and is further
discussed in The professional installer is responsible to ensure that RF output power is properly
adjusted so that it does not exceed the regulatory limit of these conditions.
ETSI Compliance – EIRP limits
For the EX-5r family, a +30dBm EIRP limit applies for operation in the 5250-5350 MHz or
5470-5725 MHz bands. Adjust the output power in accordance with the following formula:
P = 30 – G + L
where:
P
= Maximum transmitter output power of radio, in dBm
G
= Specified gain of antenna, in dBi within the operational band
L
= Total transmission system losses of all elements between the radio’s RF
connector and the antenna’s RF connector (all cables, connectors,
lightning suppressors), in dB, as specified or measured in the operational
band
For the EX-5r family, operation in the 5725-5850 MHz band, using a 10 MHz BW setting
(shown as 8MHz in the GUI), a +33dBm EIRP limit applies. Using the same definitions as
above, set the transmitter according to this equation:
P = 33 – G + L
For the EX-5r family, operation in the 5725-5850 MHz band, using a 20 MHz BW setting
(shown as 16 MHz in the GUI), a +36dBm EIRP limit applies. Using the same definitions as
above, set the transmitter according to this equation:
P = 36 – G + L
Time Division Duplex (TDD) Factors on page 13.
The two radio terminals are identical hardware, except for the TDD setting in software. When
the radios are in their default state, both radios are configured as Radio B.
One end of the link
must be configured as Radio A before the two ends of the radio system can communicate.