“Wires-only” VDSL2 Modem Test Plan - NICC

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NICC ND 1436 V1.1.2 (2013-09)
Power Meter
Baluns
Spectrum
Analyser
PC
DSLAM
Match
Pad
Line Simulator
CPE
PC
PC
Figure B.4 : Test Configuration for Measuring Downstream PSD
Details of the impedance matching pad used are contained in Annex B.1.3 .
1) Configure the DSLAM to implement an E-side electrical length (ESEL) 4 value of 30dB and
configure a port with the default band profile.
2) Set the line simulator to a loop length of 100m of TP-100 cable with noise injection disabled
(i.e. noise free).
3) Connect the CPE modem to the DSLAM using the Test Configuration shown in Figure B.4.
4) Ensure that the CPE modem has attained synchronisation.
5) Capture the downstream PSD and wideband power and compare against Part B of the BT
ANFP [6].
6) Check that the full 17MHz spectrum is used.
Note that this test can be performed as part of requirement R.VDSL2.5.
Expected Outcome – This test will be deemed a “Pass” if the full 17MHz spectrum is observed (i.e.
use of downstream band between 12 and 17.664MHz) and that the downstream transmit power
does not exceed 14.5dBm. If these criteria are not met, then the result is a “Fail”.
R.VDSL2.3
This requirement has been removed from the current revision of SIN 498.
R.VDSL2.4 Compliance with UK ANFP Part C
Refer to Annex C.
R.VDSL2.5 Support of 998ADE17 Band Plan
4 The ITU-T G.993.2 Recommendation uses the term E-side Electrical Length (or ESEL) to refer to the loss of the cable connecting the exchange to
the cabinet. The UK ANFP uses the term Cabinet Assigned Loss (or CAL) to describe the same parameter. In both cases, the insertion loss is
measured at a frequency of 300kHz.
NICC Standards Limited