Motorola MOTOTRBO SYSTEM PLANNER Specifications download pdf (Page 70)

Station Control Module

Figure 20. Station Control Module

The Station Control Module (SCM) performs station management, digital signal processing,

data formatting and audio routing for the base station/repeater. It provides interfaces to the

Exciter, Receiver and PA as well as the interfaces to external site equipment. The controller

uses two TI OMAP series processors: One for transmit and overall base station/repeater control

functions and one for all receive functions.

The audio interface provides flat and pre-emphasized transmit audio inputs as well as an

independent data/PL/DPL input. Transmit and receive audio signals are accessible on the rear

DB25 connector. A front panel microphone and speaker provide local audio (analog mode

only).

The 10/100BaseT Ethernet port is used to connect to station to a local or wide area network for

IP Site Connect and remote diagnostics & control. The front cover must be removed to access

this connector. Alternatively, a short extension cable can be used to route this connection to the

rear of the station.

A front accessible USB port provides the interface to the local service computer for radio

configuration.

The SCM provides the station frequency reference to the Exciter and Receiver module. A

TCXO (Temperature Compensated Crystal Oscillator) provides the stability required for UHF

and VHF bands and an OCXO (Oven Controlled Crystal Oscillator) provides the stability

required for 800/900MHz bands. An external frequency reference can be connected to a BNC

connector behind the front panel to calibrate the onboard TCXO/OCXO. The front cover must

be removed to access this connector.

If an external reference is to be used with the MTR3000, a short extension cable can be used to

route this connection to the rear of the station. Alternately, the reference cable (and/or Ethernet

cable) can be routed out the front of the station via the slots provided along the edge of the front

bezel.

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Motorola MOTOTRBO SYSTEM PLANNER Specifications Page 70