CE Certification of Multimedia Devices with xDSL Ports

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Update time : 2025-11-08

For multimedia devices equipped with xDSL ports, specific test requirements are specified in Tables 2.2 and 2.3 of the EN 55035 standard. These include tests for broadband impulse noise interference (repetitive) and broadband impulse noise interference (isolated). Before conducting these tests, it is necessary to prepare a suitable line simulator in advance and adopt the Cyclic Redundancy Check (CRC) method observed by the Equipment Under Test (EUT). For multimedia devices with xDSL ports, in addition to meeting the conventional requirements for surge (CS) and Electrical Fast Transient (EFT) in Electromagnetic Susceptibility (EMS), they must also undergo broadband impulse noise interference tests.

Test Requirements for Broadband Impulse Noise Disturbance

Table Clause	Electromagnetic Phenomenon	Test Specification	Unit	Remarks
2.2	Broadband Impulse Noise Disturbance (Repetitive)	Impulse FrequencyandTest Level	0.15~0.57 MHz107 dBuV0.5~10 MHz107~36 dBuV10~30 MHz36~30 dBuV	Applicable only to xDSL ports of CPE. Operating conditions refer to F.4.1; cycle frequency is set according to the AC power frequency.
		Burst DurationBurst Period	0.70 ms8.3 ms (for 60 Hz)10 ms (for 50 Hz)
2.3	Broadband Impulse Noise Disturbance (Isolated)	Impulse FrequencyandTest Level	0.15~30 MHz110 dBuV	Applicable only to xDSL ports of CPE. Tests shall be performed for all impulse durations.
		Burst Duration	0.24 ms10 ms300 ms

Setup and Test Duration for Broadband Impulse Noise Interference Tests

Broadband impulse conducted interference applies repetitive noise pulses and isolated noise pulses to the DSL port of the Equipment Under Test (EUT) respectively. Tables 2.2 and 2.3 list the level requirements, impulse durations, and impulse periods for this test.

This test procedure is carried out in accordance with the CDN method specified in iec 61000-4-6:2008, but the signal generator is replaced with a device capable of generating white noise pulses.

①　For repetitive pulse tests: Each test port shall be subjected to interference for at least 2 minutes.

②　For isolated pulse tests: At least five isolated pulses shall be applied, with an interval of at least 60 seconds between each pulse.

System Setup for xDSL Products

Line Attenuation for Different xDSL Standards

CE Certification of Multimedia Devices with xDSL Ports(图2)

xDSL Standard	Attenuation Value
ADSL/ADSL2	45 dB
ADSL2+	30 dB
ReADSL	70 dB
HDSL	35 dB
SHDSL	42 dB
VDSL	10 dB
VDSL2	4.4 dB
FAST (G.fast)	2 dB

Pass Criteria for Broadband Impulse Noise Disturbance (Repetitive)

After establishing a connection, when broadband impulse (repetitive) disturbance is applied, the modem shall be able to train and minimize link interruptions for end-users. Therefore, the following procedures and performance criteria apply. The Impulse Noise Protection (INP) level supported by the EUT shall be selected for the immunity test, and the level used shall be specified in the test report. The maximum delay shall be set to 8 ms.

①　Without impulse disturbance: Within the noise margin related to the transmission rate, the modem shall not retrain. The transmission rate depends on line attenuation and line steady-state noise (the actual value is between the minimum and maximum transmission rates preset at the port). Then, the impulse disturbance shall be applied at the required test level.

②　With impulse disturbance: The modem shall not require retraining or perform Severely Errored Second (SES) operations at the bit rate set before the application of impulse noise, nor shall there be additional CRC errors due to impulse noise.

06 Standards to Be Met for Broadband Impulse Noise Interference (Repetitive)

The number of allowed CRC errors varies with different impulse durations.

Impulse Duration (ms)	Performance Standard
0.24	The application of pulses shall not cause the xDSL link to lose synchronization, and no CRC errors are allowed.
10	The application of 5 pulses shall result in fewer than 75 CRC errors, and shall not cause the link to lose synchronization.
300	The application of pulses shall not cause the xDSL link to lose synchronization.

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