User Manual

Exalt Communications, Inc.
Exalt i-Series Installation and Management Guide
5000001 26
2007-06-25
• Number of supported T1/E1 channels
• Ethernet throughput
• System latency (delay)
Use the ExaltCalc calculator to determine optimum settings for the above parameters to
meet the needs of your application.
The following generalizations can be made with regards to these factors:
• The shorter the TDD frame size, the lower the latency
• The shorter the link distance, the lower the latency, the higher the throughput
• The longer the TDD frame size, the higher the throughput
• The higher the bandwidth, the higher the capacity
• The higher the mode, the higher the capacity
Note: Disable all T1/E1 ports if there are no T1/E1 interfaces
connected. This shifts all available throughput to the Ethernet interface.
Note: If a selected combination of the Link Distance, Frame Size,
Bandwidth, and Mode parameters cannot support all the desired T1 or E1
ports, the ports that cannot be supported are automatically disabled.
Priority is placed on the T1/E1 port number. That is, the first port to be
disabled, if necessary, is the highest port number, such as Port 4 for the
standard models, and Port 16 for ‘-16’ models (assuming that all 16 TDM
interfaces are licensed for use). See T1/E1 Configuration Pages on page 69
for more information.
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.
It can be advantageous to utilize link synchronization for collocated links. The radios
allow the use of an optional GPS synchronization kit or internal synchronization. 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,