Specifications

6
DSL measurements (Option XDM)
xDSL (ADSL and VDSL) is widely used for broadband internet connections
at homes and businesses. Service providers occasionally face problems with
interference on their xDSL lines. The interference is mainly intermittent intrusion
from nearby external sources such as electric motors, elevators, and appliances.
In order to monitor, capture and remove intermittent interference, the engineer
may need to work in the field for extended periods of time.
With hardware option XDM the N9340B now supports measurements on ADSL,
ADSL2+ and VDSL networks. It provides very good sensitivity with low displayed
average noise levels (DANL) to meet the mask requirements over ADSL fre-
quency ranges, from 9 kHz to 12 MHz, for ADSL.
Users may choose t o make the xDSL measurement in either spectrum analysis
or spectrogram mode. Using xDSL measurement in spectrogram mode is ideal
for capturing intermittent interference on xDSL lines. When used with option
INM, the DSL measurement application can measure and record DSL perfor-
mance data to a USB flash drive or PC over hours or even days.
An xDSL probe from Vierling is required to connect the N9340B analyzer to xDSL
networks for measurements in the field.
The option XDM is not available as an upgrade and must be ordered at the time
of instrument purchase. The XDM option can also be used for other applications
which require improved DANL and phase noise at frequencies from 9 kHz to
12 MHz.
ADSL measurement with N9340B XDM