![JDS Uniphase DSAM-1500 User Manual Download Page 220](http://html.mh-extra.com/html/jds-uniphase/dsam-1500/dsam-1500_user-manual_640609220.webp)
Chapter 8
Measure Mode – Basic Tab
FDR
180
DSAM Help User Guide
Rev. 001
Interleaver Depth
When viewing a locked digital signal the interleaver depth is displayed
in the BER area.
View Menu
To access different functions and shortcuts to other tests
1
Press the
View
softkey.
2
Using the arrow keys, select one of the following options:
–
Reset
– Manually resets the Constellation function.
–
Pause
(
Shift, 8
) – Suspends measurement updates.
–
Single Channel
– Displays measurements one channel at a
time. First, use the numeric keypad to enter the channel
number then highlight this option from the
View
menu.
–
DQI
– Enables you to view a time-elapsed view of DQI
measurements on digital channels only (if the hardware
supports it).
–
QAM Ingress
– Displays the QAM Ingress screen.
3
Press
ENTER
.
FDR
A frequency domain reflectivity (FDR) test displays the location and
severity of faults and breaks in a length of cable. This enables you to
replace or repair faulty cables and components.
To use FDR, you must have a JDS Uniphase Corporation LST-1700
Signal Transmitter, which provides a source for a frequency domain
reflectometry test (FDR) of home wiring.
Running an FDR
Scan
1
Connect the
cable you want to test
to the LST-1700.
NOTE
If the displayed interleaver depth is greater than the interleaver
depth supported, the BER values are displayed as dashes (-----).
The frequency, level, MER and constellation display remain accu-
rate.
21128026 R001 DSAM Help User Guide.book Page 180 Thursday, February 5, 2009 2:02 PM