Getting Started 1
Keysight U8903B User’s Guide 41
Figure 1-3 Connect the TOSLINK cable straight into the connector
9 USB port (type B) Allows the U8903B to be controlled remotely over the USB interface.
10 AC power port Connects to an AC line voltage.
11 VGA port Allows an external monitor to be connected to the U8903B.
12 GPIB port
Allows the U8903B to be controlled remotely over the GPIB (General Purpose Interface Bus)
interface.
13 USB port Allows an external USB flash storage to be connected to the U8903B.
14 Digital analyzer input and output (AES3/SPDIF)
This is only applicable for option U8903B-DGT.
Receives and outputs digital audio signal using a female BNC input connector and a female
BNC output connector respectively.
15 Digital analyzer input and output (DSI)
This is only applicable for option U8903B-DGT.
Receives and outputs digital audio signals using a 25-pin female D-SUB connector.
16 AUX port
Outputs a variable DC voltage (0.5 V to 5.1 V, up to 100 mA). The AUX port can be used to
power test devices, as a trigger, or to control external hardware.
17 Trigger in
Receives an external TTL signal using a female BNC input connector for triggering operation.
Triggering can occur on either the positive or negative edge.
– Connect the TOSLINK cable straight into the TOSLINK connector.
– DO NOT force the cable in or connect at an angle. Failing to do so may cause damage
to the TOSLINK connector.
Table 1-4 U8903B rear panel description (continued)
Item Description
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