(Please excuse the re-send as last one was an attachment-IT dept flub) Dear Group,
I have to give our design engineer the protection level requirements for two interfaces that will terminate outside plant wiring at the Customer Premise, which are T1 (RJ48) and DS3 (BNC) connectors. These will be pluggable interfaces in 1U metal chassis with AC and DC power, and a Protective Earth ground connection. The DC is DC-Isolated. The product needs to meet GR-1089 (Type 3 and 5) and other requirements such as, TIA968, ITU K.20/21 and UL60950. Although I have read through all these Standards as well as other White Papers I do not have a clear understanding of what level of voltage protection and fusing component are needed. I also don't have a clear understanding of the current limiting features. Are these requirements set by local ordinances? GR-1089 states "the telecommunications service providers apply primary voltage-limiting protectors to metallic pairs at COs, remote facilities such as environmental equipment enclosures, and at customer premises. Where telecommunications OSP is exposed to possible contact with commercial power systems, current-limiting devices (such as 350-mA heat coils) may be applied at the CO in addition to the voltage-limiting protectors for the purpose of limiting current to network equipment in the CO. Most of the tests in section 4 depend on the level of protection, which goes back to my question. How does one know what voltage limiting levels are of this primary protector? If one knew what tests are needed then the design can be determined. At this point we are looking for internal protection solutions but I also get the feeling that an external solution will need to be considered. Also GR-1089 4.10 Criteria for Equipment Interfacing with Coaxial Cable Ports state that "These criteria that interface with OSP cable are not intended for conventional telecommunications services, such as DS3". Does this mean that the DS3/BNC interface will NOT require any testing to Section 4? I maybe missing a bigger part of this picture so any advice is greatly appreciated. Ryan Jazz Jayasinghe Compliance Engineer x1198 Canoga Perkins Direct:(818) 678-3898 20600 Prairie Street Company:(818) 718-6300 Chatsworth, CA 91311-6008 e-mail: [email protected] www.canoga.com FAX:(818) 678-3798 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://product-compliance.oc.ieee.org/ Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://product-compliance.oc.ieee.org/ Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://product-compliance.oc.ieee.org/ Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
