User Manual

Exalt Communications, Inc.
Exalt i-Series Installation and Management Guide
5000001 30
2007-06-25
redundancy if the primary sync source radio (A) loses power or experiences any other
failure.
Figure 5 Collocated radios, one in AUTO SYNC mode to provide redundancy
The synchronization function can be carried across links to additional collocation sites.
For example, Figure 6 illustrates a multi-link backbone with two hub sites.
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.
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)
SYNC
SOURCE
(A)
SYNC
OUT
FAR-END
RADIO
(B)
FAR-END
RADIO
(B)
AUTO SYNC
(A)
SYNC
IN
SYNC
OUT
SYNC
RECIPIENT
(A)
SYNC
IN
FAR-END
RADIO
(B)