3M 965AMS manual DSL>DSL Noise>Application Notes, Shorted Internally

Measurement Functions 3M™ Dynatel™ Advanced Modular System 965AMS

DSL>DSL Noise>Application Notes

Noise can affect wideband services by taking up valuable bandwidth and reducing speed. Symptoms of high noise can be data errors and loss of connection. The 965AMS tester measures longitudinal as well as metallic noise. Having high noise in either of these tests will prompt you to look at the circuit with a Spectrum Analyzer to identify the source.

Longitudinal Noise is a measured between Tip [A] and Ring [B] (shorted internally) and the shield/ground.

Longitudinal Noise measures influences from outside the cable (power induction, AM radio or other outside frequencies).

RED	Ring (B) 1
GRN	Ground (Earth)
BLK	Tip (A) 1

Shorted Internally

Metallic Noise is a measured between Tip [A] and Ring [B].

Metallic Noise measures the active noise on a pair.

RED Ring (A)

BLK Tip (B)

Both tests are performed through filters based on the service that is selected in Setup.

106