MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE
Chapter 2: Installation Page 7
6. If an external controller (eg. Telex tone-remote adapter) is to be connected to the system, all wiring
should be made to the DB25 connector or to the optional screw-type A-PNL-AUX96-3 auxiliary terminal
connector shown in Figure 2-3.
The female DB25 connector can be used for basic base connections to a Telex DSP-223 or IP-223,
using a standard straight-through male-to-male DB25 cable. The IP-223 also requires that 2 pins on the
DB25 (PTT COM - pin2 and MON COM - pin 16) are wired to ground for proper operation.
WARNING: JU108 must be confi gured correctly for DSP-223 or IP-223 or damage can occur.
JU108 A for +13.8 Vdc / DSP-223 or JU108 B for Rx A COR / IP-223
The plug in screw connectors on the A-PNL-AUX96-3 can be removed to allow for easy connection of
the wires.
For some applications, a cable, not a terminal strip connector, is used to connect to the auxiliary
connector. The cable must be plugged into the P1 auxiliary connector shown in Figure 2-2 on the rear
of the subrack. Ensure locking tabs on the connector are completely engaged.
Figure 2-3: Auxiliary Terminal Connector
7. Connect the RJ45 cables between the Receiver, Transmitter and Control Card for repeater
operation.
8. Connect the RF cables to the Receiver and Transmitter and ensure they are fi rmly screwed on.
Ensure the RF cables are properly connected to the Duplexer / Antenna Relay / Multicoupler / Combiner
and Antenna.
A-PNL-AUX96-3 optional
screw-type auxiliary
terminal connector
Telex CI-DSP-223
or CI-IP-223
connector
Summary of Contents for MT-4E
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