DS3 Calibration
Document No. RF 002331D
3-4
Hardware Setup
The following sections describe how to configuring the ASA 312 and oscilloscope
for DS3 Monitor calibration.
ASA 312 Settings
To setup the ASA 312 for DS3 Monitor calibration:
1. From the ASA 312 Touch Screen, select the DS3 Protocol Processor.
2. Press the
Receive
Function Group button.
3. Press the
Line Interface Input Termination
command and select
Monitor
.
4. Press the
Framing
command and select
Unframed
.
5. Press the
Pattern
command and select
All Ones
.
6. Press the
Trnsmt
Function Group button.
7. Press the
Signal Level
command and select
DSX-3
.
Oscilloscope Settings
Configure the oscilloscope to the following settings. Refer to the oscilloscope’s
user documentation for specific operation:
■
High impedance input
■
250 ns per horizontal division
■
AC Coupled
■
20 MHz bandwidth limited
■
0V vertical offset
■
Measuring frequency—maximum peak voltage and minimum peak voltage
■
Acquisition set to average 8 samples
Calibrating DS3 Monitor
The following procedures describe how to:
■
Attach cables between the ASA 312, attenuator, and oscilloscope to adjust
the DS3 signal to 90 mV peak (refer to Figure 3-2)
■
Attach cables between the ASA 312 and oscilloscope to measure and enter
the positive and negative peak adjustment values for a DS3 Monitor signal.
Hardware Setup
Use Figure 3-2 to attach cables between the ASA 312, the attenuator, and the
oscilloscope:
1. Make sure that the ASA 312 and oscilloscope are turned on.
2. Attach a BNC T-connector to the oscilloscope’s BNC input connector.
3. Connect a BNC cable from the ASA 312’s
DS3 TX
connector to the 75-ohm
attenuator’s input connector.
4. Connect a BNC cable from the 75-ohm attenuator’s output connector to the
BNC T-connector on the oscilloscope’s BNC input connector.
5. Connect a BNC cable from the ASA 312’s
DS3 RX
connector to the BNC T-
connector on the oscilloscope.
