Jim Wiesse wrote:
Does anyone know the requirements for signal transformers for ISDN S/T interfaces in Australia. I do not have a copy of AS/NZS 3260 at this time. Specifically, I need to know the creepage, clearance, and insulation category requirements for the S/T interface and S/T interface circuits in general. Make the asumption that the power supply of the terminal adapter, meets all the applicable spacing and insulation requirements. Also the teminal adapter is a separate device from the NT1 which is exposed to the outside plant. I've been told the S/T interface could be SELV and only require operational insulation. I believe it should have at least basic insulation. But I've also been told it requires supplementary insulation or reinforced insualation. Any information would be very much appreciated and helpful. Thanks, Jim Wiese AUSTEL require supplementary insulation to 240V between ISDN line and SELV or earth. AUSTEL "Advice To Industry" (ATI) 1996/01 details their reasoning and the requirements etc and why they believe they need to deviate from the AS/NZS3260 (IEC950) requirements of clause 6.3.3. AUSTEL require that ISDN devices be "installed and maintained by service personnel" on the basis that ISDN lines are TNV and unless these devices are installed by service personnel there is no guaranty there is a "reliable earth connection" made by the device. Best regards, Kevin Kevin Richardson Ph: 043-29-4070 Stanimore Pty Limited Fax: 043-28-5639 "The Technology Requirements Specialists" Int'l: +61-43-xx-xxxx Email: Internet: 100356....@compuserve.com Compuserve: 100356,374
