User's Manual

Exalt Communications, Inc.
Exalt i-Series Installation and Management Guide
5000001 41
2007-04-15
For internal synchronization, the primary radio is designated SYNC SOURCE. This radio
provides the master timing for all interconnected radios. SYNC SOURCE radios and
collocated radios must be configured as Radio A.
Collocated radios must be in SYNC RECIPIENT mode; they receive sync signaling from
the SYNC SOURCE, either directly or daisy-chained with other collocated radios.
Alternatively, the radio(s) can be placed in AUTO SYNC mode. AUTO SYNC
synchronizes the radios to any source provided on the SYNC IN port. However, if an
appropriate synchronization signal is unavailable, the radio becomes the SYNC SOURCE
for all connected radios.
Internal Synchronization
Figure 4 illustrates the basic interconnectivity of a radio system using internal
synchronization. In this scenario, there are two radios collocated at one site.
Figure 4 Basic radio interconnectivity using internal synchronization
In Figure 5, there are three collocated radios. In this configuration it may be desirable to
make one radio a secondary sync source using AUTO SYNC. This provides
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.
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)
SYNC SOURCE
(A)
SYNC RECIPIENT
(A)
SYNC
OUT
SYNC
IN
FAR-END
RADIO
(B)
FAR-END
RADIO
(B)