NavCom SR-7120 Rev.A - Manual (Page 20)

Safari Network User Guide
Port Expander
The Port Expander is used to provide a standard connector
interface for access to COM1 & COM2 ports of the radio.
The J2 connector of the radio module connects to the Port
Expander module via a cable of up to a maximum of 300
feet.
The Port Expander is intended for installation in an
office or vehicle cab. Although rugged in
construction, it is not environmentally sealed.
In the basic configuration, the Safari Network RU is
externally powered through J1. The radio then passes
through a regulated voltage to the Port Expander. This is
typically the case where the RU is used in a mobile
environment and is powered by the vehicle battery.
Alternatively, the Port Expander can supply power to the
radio through the J2 connector. An optional AC-powered
Active Port Expander (Figure 1-2) should be used, which
converts AC to DC for operating the radio. This
configuration is desirable when an AC power source is
available.
5-Pin DIN Jack
External Power Source
(Optional)
COM1
DB9 (Serial)
COM2
RJ45 (Serial)
COM1
RJ45 (Ethernet)
To radio
Figure 1-2: Safari Network AC Port Expander
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