EXFO CableSHARK P3, User Manual, Page: 56 / 321

VF / DSL Cable Qualifier
44
TDR: Time Domain Reflectometry
- Selecting
TDR
from the CABLE TESTS pop-up menu
invokes the
TDR SETUP
menu. The TDR determines if the copper cable is suitable to
carry DSL technologies by locating potential faults along the line such as a bridge tap
or end of cable. Similar to FDR.
FDR: Frequency Domain Reflectometry
- Selecting
FDR
from the CABLE TESTS pop-up
menu invokes the
FDR SETUP
menu. The FDR determines if the copper cable is
suitable to carry DSL technologies by locating potential faults along the line such as a
bridge tap or end of cable. Similar to TDR.
NOISE:
Selecting
NOISE
from the CABLE TESTS pop-up menu invokes the
NOISE TEST
SETUP
menu. The noise test setup allows a user to perform a Power Spectral Noise,
Impulse Noise, and Impulse Noise Histogram test on the line. These noise tests help
determine if the line has too much noise to properly qualify the cable under test.
Impulse Noise is a definite source of data transmission errors.
LONGITUDINA
L BALANCE:
Selecting
LONGITUDINAL BALANCE
from the CABLE TESTS pop-up menu invokes
the
LONGITUDINAL BALANCE SETUP
menu. The longitudinal balance test ensures
that the twisted pair is balanced. A properly balanced cable allows the cable to be
resistant to common mode noise.
LOAD COIL:
Selecting
LOAD COIL
from the CABLE TESTS pop-up menu invokes the
LOAD
COIL SETUP
menu. The load coil test assists the user in determining if there is
any load coil on the cable under test.
SPECTRAL
DETECTIVE:
Spectral Detective
– Used to determine whether or not a signal from an adjacent
pair is too strong thus causing spectral incompatibility to the circuit under test. This
function button will only appear if the SPECTRAL DETECTIVE option is installed
on the CableSHARK.
RETURN LOSS:
The function associated with
RETURN LOSS
invokes the RETURN LOSS SETUP
screen. This test allows users to run a Return Loss measurement over 2 pairs of
wires. The CableSHARK measures voltage ratios, comparing the built-in reference
impedance to the external measured impedance and calculating the return loss
from that.
SHDSL
The function associated with
SHDSL
invokes the SHDSL DATA RATE
PREDICTION TEST SETUP screen. This test allows users to determine the
predicted data rate possible on a circuit by evaluating the reflected signal and the
measured background noise. Tests for SHDSL Annex A and Annex B are
available.