網(wǎng)絡設備 NEBS 認證 | 

MET憑著25余年的NEBS測試經(jīng)驗，已經(jīng)成為北美NEBS測試服務的權威

NEBS (Network Equipment-Building System)是電信行業(yè)專業(yè)術語，表示網(wǎng)絡設備構建系統(tǒng)。NEBS 的歷史可以追溯到70年代，當時它由貝爾實驗室開發(fā)，被用于標準化被最終安裝到中心局的設備。其目的是讓設備商更容易地設計兼容于典型本地貝爾運營公司的設備。標準化導致開發(fā)費用的降低和更容易將新設備引進到網(wǎng)絡中。

NEBS認證標準分為三種級別，每個級別有自己的目標和用途，但第3級確保最大的設備可操作性，用于關鍵網(wǎng)絡設備。 X335和x343提供符合NEBS 第3級標準的產(chǎn)品。

• NEBS第1級是指設備通過了確保網(wǎng)絡設備中安全部署的一系列最小測試。
• NEBS第2級提供網(wǎng)絡設備中設備可操作性的有限保證。
• NEBS第3級（最苛刻的 “壓力”測試） 提供網(wǎng)絡設備中設備可操作性的最大保證。

當通訊產(chǎn)品需要銷往北美市場，NEBS則是買家及運營商要求的認證標準。

MET一站式NEBS測試服務



1）MET 提供NEBS和OSHA要求的產(chǎn)品安全認證
2）MET 引領NEBS測試技術發(fā)展，向客戶和地區(qū)運營商備提供技術顧問，享有盛譽。定期拜訪，了解他們的最新要求
3）MET 一站式完成你所有NEBS測試：
    GR-1089-CORE
    GR-63-CORE
    GR-487-CORE
    GR-950-CORE,
    ETSI,AT&T NEDS,SBC TP76200MP,
    Verizon SIT.NEBS.RQS.NPI.2004.019.等

MET 能夠測試的NEBS標準

4）MET 是Verizon認可的獨立測試實驗室，被授權為Verizon完成NEBS和光纖模塊的測試和認證。2009年開始，Verizon對于通訊設備的增加了新的要求，即Telecommunications Equipment Energy Efficiency Rating (T.E.E.E.R.). 這個需要經(jīng)過Verizon授權在VZ-TPR-9205范圍的實驗室才有資格進行測試。MET是僅有的幾個實驗室之一。

MET的NEBS客戶包括華為,思科,朗訊，摩托羅拉等

NEBS測試項目
 

有關EMC的測試項目

Conducted and Radiated Immunity/Emissions
Conducted Emissions AC & DC Power Current
Conducted Emissions for Signals Leads/Analog Voiceband
Leads/Telecommunications Leads

有關可靠性的測試項目

Full Seismic/Office Vibration/Fungus/Airborne Contaminants(Walk-in Chamber)/Solar Radiation/Flame Resistance

有關通信的測試項目

Full Range of Lightning Surge tests/First and Second Level AC Power
Fault tests/Intrabuilding Surge/Waveform Tolerance/Steady State Power
Induction/Electrical Safety Criteria

NEBS參考資料:

What is NEBS?

NEBS stands for "Network Equipment Building System"

NEBS describes the environment of a typical Regional Bell Operating Company (RBOC) Central Office (CO). This description includes Electromagnetic, Electrical Safety and Environmental criteria.

NEBS was developed by Bell Labs back in the 1970s to standardize equipment that would eventually be installed in a CO. The intent was to make it easier for a vendor to design equipment compatible with a typical RBOC CO. This would result in lower development costs and ease the equipments introduction into the network.

Equipment deployed in the network needs to be safe, reliable, and easy to deploy. The NEBS standards provide uniform criteria for equipment design intended to reduce the cost of deployment and maintain reliability and integrity of the network.

NEBS Documents

They consist of two standards:

1. GR-63-CORE, Issue 3, March 2006: Network Equipment Building Systems – Physical Protection

2. GR-1089-CORE, Issue 4, June 2006: Electromagnetic Compatibility and Electrical Safety - Generic Criteria for Network Telecommunications Equipment

NEBS Levels

Bellcore special report, SR-3580 details 3 distinct functional levels of NEBS compliance based on GR-63-CORE and GR-1089-CORE. The levels allow a wide range of NEBS requirements to be applied to equipment based on application and network impact.

NEBS Level 1 The minimum acceptable level of environmental compatibility needed to preclude hazards and degradation of the network facility and hazards to personnel.

Possible applications for Level 1 criteria include prototype equipment for trial, limited deployment of equipment used for non-vital services, and Competitive Access Provider collocated equipment.

NEBS Level 2 The minimum level of environmental compatibility needed to provide limited assurance of equipment operability within the network facility environment. This assurance of operability is limited to controlled or normal environments by the criteria.

Possible applications for Level 2 criteria include equipment deployed in highly controlled environments such as data centers or deployments of equipment performing non-critical network service where loss of equipment operation under environmental extremes can be tolerated.

Note that this level is very rarely used because it is ambiguous. In fact, MET has never had a request or quoted to this level

NEBS Level 3 The minimum level of environmental compatibility needed to provide maximum assurance of equipment operability within the network facility environment. The Level 3 criteria provide the highest assurance of product operability. Level 3 criteria are suited for equipment applications that demand minimal service interruptions over the equipment’s life.

Possible applications for the Level 3 criteria include critical network equipment such as digital switches, transport products, and power systems.

In a nutshell, the equipment meets all of the requirements of GR-63-CORE and GR-1089-CORE.

NEBS Levels and the RBOCs

Verizon and AT&T do not follow the SR-3580 NEBS Levels. They use their own NEBS documents to describe their requirements that details what they believe are important to their networks integrity. Typically it is NEBS Level III in addition to their specific requirements that go above and beyond Level III.

Who are the Regional Bell Operating Companies (RBOCs)?

There were originally 7 RBOCs, which were formed from the 1984 breakup of AT&T. Today there are only 3:

（1）Qwest - created by the merger of US West and Qwest Communications International, Inc.
（2）AT&T - created by the merger of SBC, Ameritech, and Pacific Telesis, AT&T, and Bell South.
（3）Verizon - created by the merger of Bell Atlantic, Nynex, and GTE.

The Future of NEBS

NEBS requirements are the most widely used equipment design standards. They are highly specialized for the needs of the service providers, and have provided for robust and efficient equipment deployments for nearly 30 years.

It is unlikely that the need for NEBS requirements and testing will ever go away. The benefits in terms of performance, safety, and reliability far outweigh the cost of compliance. As long as electricity and electronics are the building blocks of telecommunication networks, EMC, Environmental and safety requirements will remain as important as ever!