6

DA9191EB.006

June 30,1997

CONNECTOR DESCRIPTION

Connector name

Pin

Function

TX

BNC-type connector for IF output.

1

TX output signal, which can contain data, audio, SAT and Signalling tone.

2

Ground.

T6

Output of the peak level detector circuit for MICOUT. See Op Amp schematic.

T7

Output of the peak level detector circuit for EXPIN. See Op Amp schematic.

RX

BNC-type connector for received IF signal.

1

RX signal input from the external IF source.

2

Ground.

T8

DEOUT is the de-emphasis filter output. The output can be used to measure blocks GC1,

F1, F3 and F4. Special test modes can be used to connect the outputs of the filter F2 and

comparators C1 and C2 to this output.

T9

RBPFIN input.

T10

EXPIN is the test point where expander input can be measured.

T11

EXPOUT test point can be used to measure the expander output.

EXTEARP

BNC-type connector for external ear piece.

1

The output signal for the external ear piece.

2

Ground.

EARP

Connector for the ear piece. Note that there are already capacitors C41 and

C42 connected to the ground on each output signal.

1

Differential output for the ear piece.

2

Differential output for the ear piece.

BUZZER

Buzzer interface. Connect the external buzzer between these points.

1

Power supply voltage from connector T1.

2

Q1 collector.

DACs

This connector contains the MAS9191A DAC outputs. MAS9191A has three 8-bit DACs.

DAC1

Output of DAC 1. This output is also connected to Vcont input of the VCTCXO.

DAC2

Output of DAC 2.

DAC3

Output of DAC 3.

GROUND

System ground.

OSCOUT

MS8323 VCTCXO output frequency

J3

Use jumper to connect DAC1 output to MS8323 Vcont input.

CTRL

TXON

Transmission is active when output is high.

BUSY

RECC is busy if pin is low.

TXCTRL

Open-drain type output. The output goes low when a transmit collision occurs.

In any other case the output is in a high impedance state.