R&S 4200 Series, Operating Manual

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ACARS Mode (External Modem) R&S XU 4200
3.87 6166.5368.02.01
3.10 ACARS Mode (External Modem)
0.
ACARS Mode\ACARS Mode "Radio".doc
This chapter This chapter provides information about the cabling and configuration of
ACARS mode.
3.10.1 Introduction/Overview
Introduction
The radio can be configured for ACARS data operation (2400 Bps).
In this case a faster RF front-end control is in action. The attack and decay
time is in accordance with the ETSI EN 300676 standard. An external
ACARS modem needs to be used for ACARS operation. Communication
between the modem and the radio is via 2 tones: 1200 Hz (bit change from
previous) and 2400 Hz (no bit change from previous).
3.10.2 Cabling
Instructions
1. Connect the TX and RX audio signals, the PTT and SQ signals with the
ACARS modem.
Cabling
Fig. 3.82 Cabling for operation with the external modem (ACARS).
2
3
8
9
5
X5
Radio
External
ACARS
Modem
AUDIO_TX_A
AUDIO_TX_B
+PTT
–PTT
GND
2
3
8
9
5
X10
AUDIO_RX_A
AUDIO_RX_B
SQ+
SQ–
GND