Pierre-Marie, Your alternate meaning is actually the same thing in terms of regulatory compliance. To the best of my knowledge, there are no regulatory Telecom approvals required for GigE services - for any country. This makes sense as what type of "Harm to the Network" can a point-to-point fiber-optic transceiver produce? I can only think of two "harms" that could happen from an IEEE802.3 compliant transceiver: - Receiver overload if the transmitted optical power was too high for the receiver. That would be instantly detected, I believe, as an LOF alarm. - Wavelength interference if the same channel was used in a DWDM link. That would be really difficult to produce! In both these cases, the problem is instantly recognizable, non-destructive, and more a function of the installation than the product design. No harm to the network would occur. That interesting link that Chris Baird sent just confirms the same thinking. That being said, it is in your company's best interest to do some amount of unit-level qualification vs. the IEEE802.3 standard - in particular the jitter characteristics and eye measurements. There are many ways of messing up the board design such that the module is no longer producing in-spec waveforms! Cheers, Marko -----Original Message----- From: Andre, Pierre-Marie [mailto:pierre-marie.an...@intel.com] Sent: Tuesday, March 18, 2003 1:12 AM To: Marko Radojicic; emc-p...@majordomo.ieee.org; treg@world.std.com Subject: RE2: Dark Fiber and Regulation
Marko, Thanks for your comments. My understanding is that a "Dark Fiber" has an other meaning : a service offered by a Telco or a service provider to extend the usage of your fiber LAN for example to increase the distance from one mile to 100 or more. In this case the fiber adapter, in my case it is a Gigabit Ethernet, will be connected to a leased line belonging to a Telco or a Service provider. So I would think as far as compliance some countries could require a Telecom approval on top of the EMC/Safety. Right ? Pierre-Marie -----Original Message----- From: Marko Radojicic [mailto:mar...@turnstone.com] Sent: lundi 17 mars 2003 18:41 To: Andre, Pierre-Marie; emc-p...@majordomo.ieee.org; treg@world.std.com Subject: RE: Dark Fiber and Regulation Pierre-Marie, There is no distinction between "Dark" and "Lit" fiber as far as standards compliance. I suspect that you will find the majority of dark fiber isn't actually dark but certain (DWDM) wavelengths on it are lit (in-use) and others are dark (not in-use). For example on a particular link, 5 DWDM channels may be in-use while 35 are dark. If you are meeting the appropriate IEEE 802.3x spec, I don't know of anything further that you would need to do. ...Marko -----Original Message----- From: Andre, Pierre-Marie [mailto:pierre-marie.an...@intel.com] Sent: Monday, March 17, 2003 5:28 AM To: emc-p...@majordomo.ieee.org; treg@world.std.com Subject: Dark Fiber and Regulation Hi there, Could somebody bring some light (!) on the so called "Dark Fiber" offering. Here is one definition I found : Dark fiber is optical fiber infrastructure (cabling and repeaters) that is currently in place but is not being used. Optical fiber conveys information in the form of light pulses so the "dark" means no light pulses are being sent "Dark fiber service" is service provided by local exchange carriers (LECs) for the maintenance of optical fiber transmission capacity between customer locations in which the light for the fiber is provided by the customer rather than the LEC. My question : The LAN product I am looking for regulation is conform to IEEE 802.3z,so the interface have been defined. Is there any standards or technical specifications for the "Dark Fiber" infrastructure ? Should I ask to each Dark Fiber Provider to get this info ? Best regards Pierre-Marie Andre Senior Approval Engineer
