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Chapter 2 Data Communications Testing
Selecting a BER pattern
Data Communications and Diphase Testing Manual
Page 16 21148872, Rev. 002 January 2016
The available settings vary based on the current timing mode (synchronous, or asyn-
chronous), and the interface that you are testing.
To specify the signal and flow control settings
1 Select the Setup soft key, then select the Signaling setup tab.
2 Specify the following settings.
The signal and flow control settings are specified.
Selecting a BER pattern
After you specify interface, timing, and data settings, you can select a BER pattern for
your test. When you select a pattern, you also specify sync loss criteria to control the
unit’s sensitivity in declaring loss of synchronization, and then indicate when the unit
should attempt to regain synchronization.
If you want to define your own pattern, see “Defining user programmable patterns” on
page 19 .
To select a BER pattern
1 Select the Setup soft key, then select the Pattern setup tab.
2 Specify the following settings:
Setting Sync Async Value
Signal Polarity X X – Normal
– Inverted
Out of Band Flow
Control Enable X X – Enable. Select a signal lead circuit
to enable flow control on the trans-
mitter.
– Disable
In Band Flow Con-
trol Enable X – Enable . Specify XON and XOFF
values using a hexidecimal format.
– Disable
Setting Sync Async Value
Pattern X X Select a pattern (See Table 7 on
page 18 ), or define your own (see
“Defining user programmable pat-
terns” on page 19
).