3

T-BERD/MTS-4000 COPPER SERVICES MODULE

3

Today’s copper network requires rigorous testing. The T-BERD/MTS-4000

equipped with Copper Services Modules performs these essential tests and more:

Overview of Copper Tests

Copper Test

Test Function

What it Tests

Why it is Needed

Fault Impact

DVOM

DSL service qualification and

DC/AC voltage, loop current, loop

Overall copper health

No DSL synchronization or low data rate

troubleshooting

resistance, distance-to-short, leakage

Opens

DSL service qualification and

Capacitance, loop length

Cable damage, loop length acceptable

The longer the cable, the higher the

troubleshooting

for DSL

attenuation, and the lower the data rate

Load Coil

DSL service qualification and

Presence of load coils and location

Load coils act as low-pass filters and

Load coils prevent DSL service

troubleshooting

must be removed

POTS

DSL with POTS service installation

Placing a POTS call

Connectivity to exchange

No POTS

and troubleshooting

Balance

DSL service qualification and

Longitudinal balance, Resistive

Robustness against noise

Noise decreases the bits-per-tone

troubleshooting

balance, Capacitive balance

load/data rate

Noise

DSL service qualification and

Noise with specific band filters

External noise corrupts good data

Noise decreases the bits-per-tone

troubleshooting

load/data rate

Impulse Noise

DSL troubleshooting

Voltage spikes above specific thresholds

Intermittent effects that cannot be

Impulse noise may lead to continuity

corrected by forward error correction

errors including IPTV pixilation and data

(FEC)

retransmission

Loss

DSL service qualification and

Rx/Tx Tones

Attenuation of copper cable

Reduced DSL data rate

troubleshooting

SNR

DSL service qualification and

Signal compared to noise level

Enough margin to sustain data rate in

Temporary loss of signal or reduced data

troubleshooting

changing conditions

rate possible

Return Loss

DSL service qualification and

Impedance mismatch

Impedance mismatch—using multiple

Reduced data rate

troubleshooting

cable types, causes energy to reflect

Near-End Crosstalk (NEXT)

DSL troubleshooting

Noise from near-end

Impact of multiple broadband services

Reduced data rate

in the cable

Spectral Analysis

DSL troubleshooting

Spectral noise per frequency

Identify the characteristics of a noise

Reduced data rate

source to fix the problem

TDR

DSL troubleshooting

Impedance anomaly and location

Detect and locate faults such as opens,

No sync or reduced data rate

shorts, bridged taps, and wet sections

RFL

DSL troubleshooting

Pair under test against a reference

Resistive fault detection and location

Reduced data rate

using ohmmeter