Exalt Communications, Inc.
r-series
Installation and Management Manual
5000007 (ETSI)
15
2007-02-12 (draft)
Link Orientation and Synchronization
Link
orientation
refers to the Radio A and Radio B placement in your network. Link
synchronization
refers to using external or internal timing to coordinate multiple links.
For every link, one end of the radio link must be configured as Radio A, while the other end is
configured as Radio B. In single-link systems, it does not matter which end of the system is
mounted at which end of the link, and there is typically no requirement for any link
synchronization.
Link orientation and synchronization are more important for networks with site(s) where there is
more than one link of the same type or for sites using the same type of radio that are very close
to each another at one or both ends.
Configure collocated radio terminals for the same link orientation. That is, configure all radios at
the same location as Radio A or Radio B.
In addition, it can be advantageous to utilize link synchronization for collocated links. The radios
allow the use of an optional GPS synchronization kit. This synchronization controls the
transmitter and receiver frame timing so that collocated radios are transmitting at the same time
and receiving at the same time. This can substantially reduce the opportunity for self-
interference. Without synchronization, collocated radios may be transmitting and receiving at the
same time, incurring near-end interference.
It is not always necessary to synchronize collocated radios. If antennas are
substantially separated or blocked from one another and/or frequency separation
tuning is used, the opportunity for near-end interference can be eliminated.
When synchronization is required or desired, one GPS kit is required for each
EX-5r link in the connected or collocated network.
Radio A/B Configuration
Use the Exalt GUI to configure the radio terminals for Radio A and Radio B orientation. Since
many other parameters also need to be set, and the Exalt GUI is needed for these configurations,
this is the best way to completely configure the radio terminals.
Radios arrive from manufacture in default configuration, orientated as Radio B and configured as
shown in Table 2.
Table 2
Factory default settings
Parameter
EX-4.9r Series
EX-5r Series
Frequency
4965 MHz
5788 MHz
Transmit Power
+4dBm
+4dBm
Link Distance
<10 miles
Bandwidth 8
MHz
Mode Mode
1
TDD Frame Size
2ms