User's Manual

Exalt Communications, Inc.
Exalt i-Series Installation and Management Guide
5000001 42
2007-04-15
Figure 6 Multiple-link site configuration, using AUTO SYNC for redundancy
Note: The configuration shown in Figure 6 is not supported in all
models at the time of this writing. Consult your Exalt representative for
details.
Virtually any combination of hubs and repeater sites, star configurations, and/or
backbones can be implemented with synchronization using these configurations. It is
typically necessary or ideal in each configuration to match the following parameters on
every radio in the network:
• Link Distance – Match to the longest distance link in the network.
• Frame Length – Match to the lowest frame length to optimize total system latency
(for example, for TDM networks) or match to a highest frame length to optimize user
throughput. Choose an intermediate value to compromise between latency and
throughput.
• Mode – It is desirable, but not always necessary, to match the mode for all collocated
links.
• Bandwidth – It is desirable, but not always necessary, to match the bandwidth for all
collocated links.
For complex networks, an Exalt engineer should review multi-link networks before
deployment as several factors can optimize the network for desired performance.
External Synchronization
Use an external GPS source as an alternative to the internal synchronization source for
system synchronization. This is ideal for links that are nearby each other, but are not
directly collocated at the same site.
Figure 7 illustrates using a GPS source for the
primary synchronization at a typical site with collated radios.
AUTO SYNC
(A)
SYNC
SOURCE
(A)
AUTO SYNC
(A)
SYNC
OUT
SYNC
IN
FAR-END
RADIO
(B)
FAR-END
RADIO
(B)
SYNC
OUT
SYNC
IN
FAR-END
RADIO
(B)