DLS DLS 400A, Operating Manual

Page: 61 / 226

ADSL NOISE GENERATOR DESCRIPTION
Page 49
The difference in levels due to different numbers of interferers is:
6.7 Crosstalk Generator C
The (high frequency) crosstalk generator C produces noise with frequency components up
to 2 MHz. Reference levels of noise, with dBm based on 100
Ω
, are:
The difference in levels due to different numbers of interferers is as given above in
section 6.6.
Number of disturbers
Level difference [dB]
relative to 10–disturber
Level difference [dB]
relative to 49–disturber
49 +4.1 +0.0
24 +2.3 –1.8
20 +1.8 –2.3
10 0.0 –4.1
4 –2.4 –6.5
1 –6.0 –10.1
Type Level [dB]
10–disturber ADSL FEXT –69.6
ADSLA –49.4
ADSLB –43.0
10–disturber T1 NEXT –47.8
10–disturber AMI –46.0
49–disturber T1 (AMI) NEXT –43.7
49–disturber EC ADSL downstream NEXT –25.4
49–disturber FDM ADSL downstream NEXT –43.5
49–disturber FDM downstream FEXT (9kft 26 AWG) –70.5
49–disturber FDM ADSL downstream NEXT –43.5