ADSL NOISE GENERATOR DESCRIPTION
Page 38
6.
ADSL NOISE GENERATOR DESCRIPTION
6.1
General
The DLS 400 system can contain up to 2 noise cards. Each is used to inject noise at one
end of the wireline. A card in slot A injects differential mode impairments at the input/out-
put connector A of the DLS 400, and the card in slot B injects noise at connector B. The
card in slot B is used to inject longitudinal noise on to the wireline. When there are 2
ADSL cards, the transformer is connected to the card in slot B. If there is only 1 ADSL
card, that card is connected to the transformer and is used to supply the longitudinal noise.
You must indicate the impairment cards loaded, by selecting Unit Configuration from the
Options menu of the Control Screen.
Figure 6.1 System Configuration Screen
6.2
Grouped Impairments
Most impairments generated are specified by ANSI’s T1E1 committee setting standards
for ISDN Basic Rate, HDSL rate and ADSL rate testing of transmission devices. Some of
the impairments are specified by the ETSI committee that sets standards for the same set
of transmission device tests in Europe. In addition, the ITU is also starting to set standards
for ADSL testing. When grouped by the relevant standards, the impairments are as fol-
lows:
Summary of Contents for DLS 400A
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