Hello: The applicable safety standards are UL 1459 (if our design is to appear on the market before april 1, 2000), UL 1950 (which will supersede UL 1459 for all new product on April 1, 2000, and will supersede UL 1459 for all existing telecom equipment by April 1, 2005), FCC part 68, and you will likely need to comply with Bellcore GR-1089.
If you are interested in meeting the UL 1950 requirements (which will be required soon), you should consider the T1 line a TNV (telecommunications Network Voltage) circuit. Knowing this, and considering the layout and type of circuit on the secondary side of your isolation, you can determine the required spacing between primary and secondary circuits. Keep in mind you will need to meet the spacing (creepage & clearance) requirements of UL 1950 inside the transformer as well. There have been some good TREG discussions on this topic, which are archived at the following address: http://uc.com/bin/dbml.exe?action=Query&template=/rcic/vch.dbm. Mel Pedersen Midcom, Inc. Homologations Engineer Phone: (605) 882-8535 e-mail: [email protected] fax: (605) 886-6752 Disclaimer: All of the above is to the best of my knowledge, and not necessarily the opinion of Midcom Inc. ---------- From: Daniel Maverick Falkoff[SMTP:[email protected]] Sent: Friday, September 06, 1996 11:05 AM To: [email protected] Subject: Re: Layout considerations for T1 (for safety, EMC) I apologize if the subject has been covered recently.. Can anyone summarize the applicable rules and standards for the part of a circuit that will connect to a T1/E1 line? My board, almost ready to build, connects to a T1 line directly using a transformer coupled interface. I've never done T1 before and don't know for sure what protection, spacing applies. My connector is an RJ-48. Examples would be welcome, a consultant would be grudgingly considered. Dan Falkoff email: [email protected] employer: NetPhone Inc. ..makers of the NetPhone PBX-on-a-card www.netphone.com phone: (508) 787-1000 Ext 204 FAX: (508) 787-1030
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