Chapter 1 Overview
Using the front and rear panels
12 WCDMA Options Version 6.20
AUX 3 — Reserved for later use. Please do not connect anything here.
AUX 4 (
AUX out) — Using the Audio Option of the 4400, audio signals can be
made available on this output, for example to connect the 4400 to an external
loudspeaker. The output is available on pins 8 and 9 of this connector.
The output impedance is 8 Ω; the maximum output power level is 1 W.
AUX 4 (AUX in) — This input can be used to pick up audio signals with a micro-
phone and to use those signals for audio measurements.
The auxiliary input is available on pins 12 and 13 of this connector.
This unbalanced input is only used when the Audio option is installed.
The input impedance is < 1 kΩ.
The usable AC frequency range stretches from 30 Hz to 20 kHz.
AUX 5 — This is a diagnostic port without any user application.
AUX 6 — For future use.
EVEN SEC OUT — This is a CDMA-related periodic signal. The signal on this BNC
connector is TTL, with a period of 2 seconds. A negative pulse occurs every two
seconds, with a pulse width of approximately 51 nanoseconds.
CLOCK OUT — This BNC connector transmits a periodic TTL CDMA clock signal.
Please refer to sections CDMA Call Mode and CDMA Non-call Mode in the CDMA
user’s guide for more information.
DATA PORT 1 — This RJ45 connector is a test port for CDMA without any user
application.
DATA PORT 2 — RJ45 connector for future use.
HAZARD
AUX out is a balanced output. This means that the voltages provided are floa-
ting.
Never short-circuit these two pins and never connect them to ground as this
could result in an immediate destruction of the AUX out output stage of the
4400.
HAZARD
The absolute maximum input voltage is 1 V (rms) AC. An AF input voltage of
more than 1 V (rms) AC may result in an immediate destruction of the highly
sensitive AUX in input stage of the 4400. Willtek will not accept liability for
any damage of the input stage due to overload.
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