On September 30, 2012, the previous version of ETSI EN 300 132-2 will be withdrawn, and ETSI EN 300 132-2 v2.4.6 (2011-12) will take effect. ETSI 300 132-2 covers the testing requirements for the DC power ports of telecommunications equipment. It is not a harmonized standard, but it is often required by EU carriers like Deutsche Telekom and British Telecom.
Here are the most significant additional requirements in this new revision:
4.2 Normal service voltage range at interface “A”
Test method now references EN 61000-4-29. The voltage variations now have dwell time and rise/fall time requirements.
4.3.2 Abnormal service voltage range at interface “A”
Same as 4.2 above but with abnormal service range defined in table 2.
4.3.3 voltage transients
Same 1.2/50 or 8/20 combo waveform @500V, but only one configuration now.
4.4 voltage changes due to regulation of the power supply
Defines voltage variation ranges; test method remains the same as before.
4.6 Maximum current drain
The EUT’s current drain cannot exceed 1.5 x Imax only in the range of -54V to -40.5V. For the range of -40.5V to 0V, it is allowed to exceed this amount. This is different from before when the current drain could never exceed 1.5 x Imax throughout the entire range.
4.7 Inrush current on connection of interface “A”
Same as before but with the following additional performance criteria:
- Below 0,1 ms, the inrush current is not defined
- Below 0,9 ms the It/Im ratio shall be lower than 48
- Above 1 ms the curve corresponds to the maximum tripping limit of majority of existing protective devices
4.8 Conducted immunity requirements of the telecommunications equipment at interface “A”: narrowband noise
Conducted immunity shall apply only to telecommunication equipment having analogue voice interface.
Additional Note 3: The test should be limited for equipment with an input not higher than 10A.
4.9 Conducted Emissions requirements of the telecommunications and datacom equipment at interface “A”
Conducted emissions requirements shall not be applicable at equipment installed in outdoor location such as shelters and street cabinets. Due to the nature of the emitted noise this could be influenced only other equipment directly connected at the interface “A” present in the outdoor location.
For telecommunications equipment fitted with analogue interfaces an evaluation of wideband noise amplitude in this frequency band can be calculated using method detailed in annex E.
For more information, read an IN Compliance article on ETSI EN 300 132 2 Compliance Testing by MET Engineer Zijun Tong.
Last week, MET Labs hosted a joint meeting of the Central Texas Chapter of the IEEE EMC Society and the Central Texas Chapter of the IEEE Product Safety Engineering Society. The feature presentation – “Ten Things You Must Know about NEBS” – was a topic of interest to both groups.
The Network Equipment Building System (NEBS) testing presentation was introductory in nature, but featured some information that we thought would be interesting to Compliance Today readers:
Cost Versus Schedule
The more samples provided, the quicker the testing process. On the flip side, the more samples provided, the higher the test costs. The telecom equipment manufacturer needs to submit to the test lab the optimal number of samples to balance speed and cost.
Plan on a minimum of three units for the NEBS test cycle:
- One for GR-63-CORE
- One for GR-1089-CORE
- One for second level lightning, AC power fault, and fire resistance tests
GR-63-CORE requires that a product be set on fire from the inside. A methane line burner (simulating a burning line card) is inserted into the product and allowed to burn for 330 seconds.
This test should be performed first on a unit that is populated with the correct fuel load. The mechanism for the normal operation of the fans should be engaged and the unit should be fully cabled as well.
The NEBS seismic test simulates about an 8.2 Richter Scale earthquake. Equipment must be operational before and after the test. The objective is the equipment is operational during the test.
GR-1089-CORE specifies electromagnetic compatibility (EMC) testing requirements.
Section 2 covers electrostatic discharge (ESD) and electrical fast transients (EFT). ESD testing is performed at 4 kV and 15 kV air and 8 kV contact.
Section 3 covers electromagnetic interference (EMI). A NEBS product must pass radiated and conducted emissions tests as well as radiated and conducted immunity tests. The frequency range for radiated emissions and immunity is 10 kHz to 10 GHz.
Section 4 covers lightning and AC power fault requirements. Even if the product doesn’t have any signals going to outside plant (OSP), there are still intra-building surge and power-cross events that must be addressed.
Section 5 covers steady-state power induction. This affects network equipment interfacing with OSP.
Additional RBOC Requirements
Each Regional Bell Operating Company (RBOC) has its own requirements beyond GR-63 and GR-1089.
Verizon has stricter pass criteria for fire resistance and has its own guidelines for some of the EMC requirements. Verizon also has specifications for hazardous substances (RoHS), energy efficiency (TEEER), and thermal modeling (TMST).
AT&T has its own requirements for DC power and energy efficiency (TEER).
Korea’s Radio Research Agency (RRA) has just announced new regulation which will take effect January 24, 2011.
These changed regulations will significantly impact the current approval process for Korea. Listed below is the summary of changes:
- The KCC mark and logo will be changed to the KC mark, which will be the only mark for all Korea approvals. This KC logo will be enforced from January 1, 2011.
- From January 24, 2011, four approval options will be changed to three new approvals.
The old approvals were:
- EMC Approval
- Telecom Approval
- Wireless Approval
- Wireless Registration
The new approvals are:
- Compliance Approval (wireless products)
- Type Registration (ITE products and industrial products)
- Probable Approval (New products and developing products for which RRA does not have test standard)
For ITE, a RRA authorized lab needs to do the testing but there is no need to submit a test report to RRA.
In the case of Industrial products, the manufacturer can do the testing by itself and keep the technical documents for 5 years.
Today is the second day of the Product Safety Engineering Society’s (PSES) 3-day IEEE Symposium on Product Compliance Engineering in Boston, Massachusetts. In attendance and taking notes is Rick Cooper, MET Laboratories’ Director of Laboratory Operations, Safety Laboratory.
“Safety Considerations for Smart Grid Technology Equipment” was presented today by Don Geis of Alcatel-Lucent. Here are his key points:
The Smart Grid merges many technologies:
- Power systems
- Information technology
The smart grid is viewed like the Internet; no one is sure what it will look like in the future.
The main function of the smart grid is to manage power consumption in optimal ways. It is viewed as a necessary next step in order to modernize the grid.
The first IEEE-convened conference on smart grid technology was held at NIST on October 4-6, 2010, yet no one was able to say for sure how the smart grid is going to be implemented.
The development of the current electrical grid is noted by the National Academy of Engineering as the most important achievement of the 20th century. The Obama administration is committed to the smart grid.
The current electrical grid would be recognizable by Thomas Edison; that’s how old the current technology is.
Alcatel-Lucent recommends a modular approach to smart grid products:
- Use the current safety meter standard
- Apply requirements for information technology from applicable standard
- Apply requirements for telecommunications technology from applicable standard
IEC 62368-1 – hazard-based safety engineering – can be used as a basis.
For now, it is thought that IEC 60950-1 will be used for equipment that contains telecommunication or information technology equipment. In addition, use IEC 60950-22 to address outdoor equipment.
There is no reason to believe that utility-owned equipment will be viewed/handled any differently than has been done in the past, at least for the foreseeable future.
We can expect some traditional appliances (washers, dryers, refrigerators and thermostats) to eventually be able to communicate on the grid, so that they can be an effective part of a smart grid.
Typical smart grid products are subject to overvoltage category III or IV, while IT products are traditionally only subject to overvoltage category II; will probably require surge protection or other protection as it may not be possible to increase spacing.
For peak demand cycles, it is expected that energy storage will continue to be a requirement; this may extend to residential application, as opposed to the traditional commercial location.
Special safety concern: Islanding. Locally-generated power must sense when the grid has failed, and cease to energize the grid, otherwise utility workers may be exposed to a hazard.