NEBS (Network Equipment-Building System) describes the environment of a typical United States RBOC Central Office. NEBS is the most common set of safety, spatial and environmental design guidelines applied to telecommunications equipment in the United States. It is an industry requirement, but not a legal requirement.
NEBS was developed by Bell Labs in the 1970s to standardize equipment that would be installed in a central office. The objective was to make it easier for a vendor to design equipment compatible with a typical Regional Bell Operating Company (RBOC) central office (CO). This would result in lower development costs and ease the equipment's introduction into the network. Telcordia now manages the NEBS specifications. The four then-largest US Telecommunications companies (AT&T, Verizon, BellSouth, and CenturyLink) created the Telecommunications Carrier Group (TCG), a group formed to synchronize NEBS standards across the industry in the US. The TCG checklist specifies the individual NEBS requirements of each of its members in a matrix, making it simple to compare them.
YouTube Encyclopedic
-
1/3Views:1 311 1932 677 98679 168
-
Tour of my home network.
-
4 Brilliant Uses for an old SATELLITE DISH!
-
New Computer Networking Lab and Classroom
Transcription
I have received several requests for a tour of my home network so here you go. I have dedicated an entire closet to be the heart of my home network. I actually screwed a piece of plywood to the wall so that I could freely mount any network hardware that I needed. My main connection to the internet is this standard old cable modem, provided by Charter Cable. I actually have 2 terabytes of file storage. The way I have this configured is with 4 hard drives, each one being 1 terabyte. However, only two of the hard drives are used for file sharing. The other two are backup drives and each night a script is run to automatically clone the data from the main hard drives. These drives are all daisy chained through a single firewire connection on this old Mac Mini G4, which works as my file server and web server, amongst other things. I also do my voice narration recording in here. That is why I have the big microphone connected. All of these ethernet cables go up into the attic where they're distributed around the house to wall jacks, like this one. I labeled each jack with a number that corresponds to a particular port on a particular switch. That way if I ever need to troubleshoot a connection, I know where the other end goes. I'm a strong believer in ethernet. While I do have two wireless access points in my house, one at each end, I do not use these for anything except mobile devices. So I have quite a few things connected to my ethernet switches. I'll show you some of it. I have a color laser printer. I do not believe in inkjet printers. I think they are a big waste of money since the ink costs more than the printer. I also have a black and white laser, copier, and scanner on the network. This is my main office, or computer room. This is how things look day to day, I didn't clean anything up for you. This is my main computer, which is a Mac Mini. This is where I edit all of my videos. Here is a workbench I use for everything from repairing computers to shooting videos of things. These two Mac Mini setups are for my two kids. I even have a computer in my garage. I have a cheap monitor on the wall and this old Mac Mini G4. I use it mostly for displaying PDF images or searching the web while I'm working on projects in the garage. This is my wife's desk, and yes it stays that messy most of the time. This is my living room TV. Besides the Nintendo Wii, you'll also little black Western Digital box. This thing is wired into my network and allows me to watch Netflix, Hulu, or files stored on my local main file server. I have one of these on every TV in the house. This is essentially our only source of television content. We have no cable or satellite. Well, I hope you enjoyed the tour. I would just like to point out that a lot of people think I have this extravogent, expensive computer network. And really, I don't. Most of the equipment I've bought used off of eBay for nearly nothing. So I don't have a lot of money invested in my network. But what I do have a lot invested is time. Particularly when it comes to running all of the ethernet cables. I've typically done it over a period of years on an as-needed basis. I started off with one switch, then two, and now three. And it more or less works like this. We re-arrange a room and we're like "Oh well, now we need an ethernet jack over here" so I run a new jack. And just over a period of several years I've ended up with nearly 48 network jacks in the house, so I have a live ethernet jack on every wall. I'm really, really a proponent of ethernet. I mean, I know everybody loves wireless because it's so convenient. And nearly every device I have in the house is capable of wireless but I just don't like it because it's not fast enough, its not reliable enough, it's too complicated. You've got to deal with SSID's, encryption, interference problems, and range issues and you know, so I just do not use wireless unless it's a mobile device like an iPad, or laptop, or iPhone, or iPod, or something like that. Everything else, I just much prefer to plug the wire in. It works, and it always works, and it keeps on working, and I don't have to worry about any of the complicated mess of wireless. So that's just the way I do things. Anyway, leave some comments. Tell me what you think. Till next time!
Levels
"NEBS Level 1" means a very low threshold of equipment hazards and network degradation. NEBS Level 1 addresses the personnel and equipment safety requirements of GR-63-CORE and GR-1089-CORE. Operability requirements are not enforced for NEBS Level 1 certification. It is primarily used for getting prototypes into lab trials. RBOCs require all equipment deployed by CLECs to be NEBS Level 1 certified.
"NEBS Level 2" addresses equipment operability in a controlled environment (usually datacenters) that will not be subjected to environmental stress. Because of ambiguity, this level of certification is rarely (if ever) used.
"NEBS Level 3" is a term from Bellcore special report, SR-3580, and means the equipment meets all of the requirements of GR-63-CORE and GR-1089-CORE. NEBS Level 3 has strict specifications for fire suppression, thermal margin testing, vibration resistance (earthquakes), airflow patterns, acoustic limits, failover and partial operational requirements (such as chassis fan failures), failure severity levels, RF emissions and tolerances, and testing/certification requirements.
NOTE:
- Verizon and AT&T do not follow NEBS Level 3 or SR-3580. They use their own NEBS checklist, Verizon Checklist (in MS Word format) and AT&T Checklist, that details what they believe are important to their network's integrity. Both accept the TCG Checklist that can be found at those websites.
Physical protection of equipment
NEBS contains the key industry requirements for how to design and build reliable electronics for telecom network use. It is unique in its focus on telecommunications applications and environments for electronic systems. The proper design, engineering, manufacturing, and workmanship of equipment are critical for long-term use in all environments.
For physical protection, good engineering practices cover metal surface treatment and contact compatibility, flammability ratings, component marking and traceability, electrical and mechanical integrity, and a variety of process manufacturing issues.
The RBOCs often require that detail design selection and implementation take into account the various elements of NEBS GR-78, Generic Requirements for the Physical Design and Manufacture of Telecommunications Products and Equipment
GR-78 has requirements that cover details of design implementation that need to be discussed, reviewed, and implemented, as appropriate, in equipment intended to be NEBS compliant. Topics include, but are not limited to, materials and finishes; electrostatic discharge requirements; printed wiring boards and assemblies; connectors, wire, and cable; product marking and identification; and qualification test procedures. GR-78 also clarifies the industry position on the use of Lead (Pb)-free solder and allows for alternative finishes such as immersion silver, etc.
References
This page was last edited on 16 March 2021, at 18:40