Thanks Larry: I will pass this along to emc-pstc also. The confusion as to what the new type B surge requirements are may lie a disparity in what was presented at the last FCC/TIA conference. After reviewing my notes, the rough draft version of the new part 68 requirements specified the new surge as being 9x720, but the conference notes said 10x700. They probably corrected it but maybe I missed the boat.
I suppose all one needs to do is look in the CS-03 requirements, the FCC part 68 should be coming out shortly anyway. Thank you!! Mel Pedersen Midcom, Inc. Homologations Engineer Phone: (605) 882-8535 [email protected] Fax: (605) 886-6752 ---------- From: [email protected][SMTP:[email protected]] Sent: Wednesday, August 27, 1997 4:19 PM To: [email protected] Subject: Re: FCC Part 68 new Surge requirements Hi Treg, Mel, etc, I believe the new "B" type surge applicable only in the US are the following: 1000V, 25A 10x700 uS (Metallic Tip to Ring) 1500V, 37.5A 10x700 uS (Longitudinal Tip/Ring to Ground) Two repetitions in each polarity and the device must continue to operate after the surges. These are the same rise/fall time constants but I do not believe they follow the voltage/current requirements of European Specification ETS 300 046 -1/-2. These new surges are already applicable to ISDN and PSDS equipment, because of Public Notice #70049 which came out on August 15, 1996 and was effective November 13, 1996. I haven't heard of TSB-31(b) being released yet as it is still in review at the FCC (Bill please correct me if I am wrong), therefore the rest of the telephone interfaces covered under Part 68 (Loop Start, Ground Start, DID, E&M, T1, etc.) are not currently required to meet the type B surge. Larry Stillings Compliance Worldwide, Inc. P. O. Box 233 Canterbury, NH 03224 Phone/Fax 603-783-4775
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