MODMER / TTMER3

TTMER3: Alapsávi digitális jelátvitel rézkábelen

Devices used at the measuring place

Measuring equipments:

PRACITR. GF-62 - Measuring transmitter
PRACITR. MV-62 - Measuring receiver
Oscilloscope (with FFT module)
Pseudo random signal generator
Low pass filter
Consultronics CableShark xDSL cable qualifier (TDR measurer)
Interface tester HP 37732A or Siemens K4305 (to the measurement of bit error ratio)

Objects, tools

4 pieces of appr. 500 meter long copper pair with the diameter of 0,4 mm. Wave impedance: ~ 120 ohm
Cable can be found under the table at the measuring place. Length of the multi-core cable is 80 meters, and the 500 meter long copper pairs was evolved by connecting the 80 meter long copper pairs in series. The 500 meter long pairs are lead out to a connection box at the measuring place on the following way:


                           +---+- cable     +---+-- cable end
                           |   |  start     |   |
                           K   K            V   V
           +------------------------------+------------------------------+
           |+-+ +-+ +-+ 1 +-+_+-+         |+-+_+-+ +-+   +-+ +-+         |
           |+-+ +-+ +-+   +-+ +-+         |+-+ +-+ +-+   +-+ +-+         |
           |+-+ +-+ +-+ 2 +-+_+-+         |+-+_+-+ +-+   +-+ +-+         |
           |+-+ +-+ +-+   +-+ +-+         |+-+ +-+ +-+   +-+ +-+         |
           |+-+ +-+ +-+ 3 +-+_+-+         |+-+_+-+ +-+   +-+ +-+         |
           |+-+ +-+ +-+   +-+ +-+         |+-+ +-+ +-+   +-+ +-+         |
           |+-+ +-+ +-+ 4 +-+_+-+         |+-+_+-+ +-+   +-+ +-+         |
           |+-+ +-+ +-+   +-+ +-+         |+-+ +-+ +-+   +-+ +-+         |
           |+-+ +-+ +-+   +-+ +-+         |+-+ +-+ +-+   +-+ +-+         |
           |+-+ + + +-+   + + +-+         |+-+ + + +-+   +-+ +-+         |
           |+-+ +-+ +-+   +-+ +-+         |+-+ +-+ +-+   +-+ +-+         |
           |+-+ +-+ +-+   +-+ +-+         |+-+ +-+ +-+   + + +-+         |
           +------------------------------+------------------------------+

2 pieces of Telindus Crocus HDSL modem