“Wires-only” VDSL2 Modem Test Plan - NICC

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NICC ND 1436 V1.1.2 (2013-09)
B.1.2.8.3 Ethernet, WAN and OAM
NOTE : Additional Test requirements are for further study.
R.VDSL2.18 R.OAM.4 Support of “Dying gasp”
Description – The Modem should support “dying gasp” as defined in Section 11.3.3.2 of G.993.2
[3] and Section 7.1.1.2.3 of G.997.1 [10].
Note: “Dying gasp” is not a mandatory requirement in SIN 498 but CPE providers are encouraged
to implement this in their modems as it will enable the Openreach Test & Diagnostic systems to
differentiate between a modem being turned off by the end user (loss of power) or a loss of signal
(loss of connectivity) caused by a potential network or home wiring issue. This will support CPE
providers in their diagnostic approach to ensure that their End Users have checked relevant setup
prior to submitting a fault to Openreach and thus ensure the correct cause of action and avoiding
an unnecessary cost due to potential chargeable visits due to End User issues.
Test procedure –
Noise Generator/
Injector
DSLAM
Line Simulator
NTE5 +
iSSFP
CPE
PC
PC
Figure B.8 : Test Configuration for verifying “Dying Gasp”
1) Configure DSLAM to implement an ESEL value of 30dB and configure a port with the
default band profile.
2) Connect the DSLAM and the CPE using the Test Configuration shown in Figure B.8.
3) Set line simulator to simulate a loop length of 100m with noise injection disabled (i.e.
noise free).
4) Once the CPE has attained synchronisation, verify that no additional alarms have been
raised on the EMS.
5) Disconnect the plug from the power socket on the CPE. The modem should now power
off.
6) Check and record the EMS alarm messages.
7) Replace power plug in socket and allow modem to resynchronise.
8) Repeat steps 5 and 6 but this time switch off the power at the mains socket (or
disconnect PSU from socket).
9) Check and record the EMS alarm messages.
NICC Standards Limited