JDS Uniphase SmartClass E1, Руководство пользователя

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Chapter 4 E1 Testing
Measuring Jitter
44 SmartClass E1 Tester User’s Guide
3 Specify the test settings. The following table describes the settings.
Setting Parameter
Test Mode Select one of the following:
–
Terminate
– Monitor
– Bridge (HI-Z)
AMS Jitter Mode Select one of the following:
–
MTJ - maximum tolerable jitter
– FMTJ - fast maximum tolerable jitter
– JTF - jitter transfer function
AMS Jitter Settings Specify the following automated measure-
ment sequences (AMS) settings:
–
Settling Time - The amount of time a
DUT is allowed to settle and adjust to a
change in the frequency or amplitude of a
received signal. The E1 Tester resumes
error measurement after the specified
time elapses.
– Gate Time - Time duration for error mea-
surement. During this period the error
source is accumulated if it is an error or
recorded if it is an alarm. (not selectable if
Jitter Mode is “JTF”.)
– Sensor Threshold - The number of
alarms or errors allowed by the MTJ/Fast
MTJ sensor that will result in a pass status
for a particular transmit amplitude and fre-
quency point. (not selectable if Jitter Mode
is “JTF”.)
– Sensor - The alarm or error source used
to determine the jitter tolerance at a partic-
ular transmit amplitude and frequency
point. (not selectable if Jitter Mode is
“JTF”.)
Manual Jitter Settings (only
selectable if the Test Mode
is “Terminate”.) Specify the following:
– Modulation: On or Off
– Jitter Tx Frequency
(Hz)
– Jitter Tx Amplitude (UI)
NOTE: Manual jitter is the default jitter mode.
It begins running when you enter the jitter
application.
Interface Settings Specify the Tx Clock Source, TX Line Code,
and Rx Line Code as described in
“Specifying
interface settings” on page 30 .
Frame Settings Specify the Framing, Payload, Time Slots,
and Sa bits as described in
“Specifying E1
framing settings” on page 31 .
Pattern Settings Specify the pattern as described in “Specify-
ing a BERT pattern” on page 33 .
Error/Alarm Settings Specify the settings as described in “Specify-
ing Error/Alarm settings” on page 35 .
Performance Settings Specify the settings as described in “Specify-
ing performance settings” on page 36 .