NavCom SR-7120 Rev.A - Manual (Page 45)

Safari Network User Guide
2-19
These parameters CANNOT be changed in any RU or SCU
from the NCU. Each individual radio module in the
network must be changed at the unit.
Additionally, data encryption such as triple DES or PGP
can be employed at the application level to provide an
extra level of security.
Multiple NCUs
As discussed in Chapter 1, Introduction, typically one NCU
is used in a single network. However, there are instances
where an application may require a redundancy of NCUs.
A backup NCU (B-NCU) (or multiples) can be
programmed to duplicate the primary NCU, and switched
into backup service if needed simply by powering on the
B-NCU.
Multiple coexisting networks can be established in order
to expand the total bandwidth available. NCUs have been
designed to operate synchronously to prevent jamming in
this scenario. Synchronization of the NCUs can be
accomplished by physically cabling them together via the
J1 ports, or configuring one NCU as a synchronous
transmitter, and the other NCUs as a synchronous
receiver. This is accomplished with the external
synchronization setting in the NCU setup. The primary
NCU is set for transmit synchronization, and the
secondary NCUs are set for receive synchronization.