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TR41.9.2-04-05-012-MR1 STANDARDS PROJECT: TR41.9.2 – Update TSB31-C Section 8.3 for Hazardous voltage limitations – Off premises station voltages - TIA 968-A Section 4.4.1.4. TITLE: Proposal to update TSB31-C Section 8.3 for Hazardous voltage limitations – Off premises station voltages - TIA 968-A Section 4.4.1.4. ISSUES ADDRESSED: Update TSB31-C Section 8.3 for Hazardous voltage limitations – Off premises station voltages - TIA 968-A Section 4.4.1.4. SOURCE: Siemens ICN CONTACT: Tailey Tung Phone: 408-492-5049 Fax: 408-492-2563 Email: [email protected] DATE: April 13, 2004. DISTRIBUTION TO: TIA TR41.9.2 KEYWORDS: TSB31-C Section 8.3 test procedures NOTICE: The contributor grants a free, irrevocable license to the Telecommunications Industry Association (TIA) to incorporate text or other copyrightable material contained in this contribution and any modifications thereof in the creation of a TIA Publication; to copyright and sell in TIA's name any TIA Publication even though it may include all or portions of this contribution; and at TIA's sole discretion to permit others to reproduce in whole or in part such contribution or the resulting TIA Publication. This contributor will also be willing to grant licenses under such copyrights to third parties on reasonable, non-discriminatory terms and conditions for purpose of practicing a TIA Publication which incorporates this contribution. This document has been prepared by Siemens ICN to assist the TIA Engineering Committee. It is proposed to the Committee as a basis for discussion and is not to be construed as a binding proposal on Siemens ICN. Siemens ICN specifically reserves the right to amend or modify the material contained herein and nothing herein shall be construed as conferring or offering licenses or rights with respect to any intellectual property of Siemens ICN other than provided in the copyright statement above. 8.3 8.3.1 Hazardous Voltage Limitations, OPS TIA-968-A, 4.4.1.4 Background The Off Premises Station (OPS) function in CPE provides loop start line signaling similar to that normally provided by a CO line circuit. This means that it provides not only the battery necessary for talking and dc signaling but also the ac ringing voltage for signaling from the CPE to the station equipment. A network private line facility connects the OPS line circuit with the remote station equipment. Thus, there are two network interfaces, one at each end of the private line facility. Approved station equipment is used as the off premises station. The hazardous voltage requirements for OPS ports were written to protect network personnel. The ac voltage limit for ringing exceeds the combined ac/dc limit for non-hazardous voltages, but is to meet specific duration requirements to render it non-hazardous. 8.3.2 Purpose To verify that the OPS line interface complies with the specified ac and dc voltage limits. 8.3.3 Equipment (1) DC voltmeter SEL# 22. (2) True rms ac voltmeter SEL# 41. NOTE: Refer to Section 5.3 for equipment details. 8.3.4 Equipment States Subject to Test (1) Idle open circuit. (2) Ringing open circuit. 8.3.5 (1) (2) Procedure In the idle open circuit state, measure the dc voltage with the dc voltmeter connected between: (a) T(OPS) and R(OPS); (b) T(OPS) and ground; (c) R(OPS) and ground. In the idle open circuit state, measure the extraneous ac voltage with the ac voltmeter connected between: (a) T(OPS) and R(OPS); (b) T(OPS) and ground; (c) R(OPS) and ground. (3) (4) 8.3.6 In the ringing open circuit state, confirm that the ringing signal is applied to the proper lead by measuring the ac voltage with the ac voltmeter connected between: (a) T(OPS) and ground; (b) R(OPS) and ground. Perform tests specified in Section 8.8 to verify compliance with ringing source requirements. Alternative Methods None suggested. 8.3.7 (1) (2) (3) Suggested Test Data DC voltages during idle open circuit state: (a) T(OPS) and R(OPS); (b) T(OPS) and ground; (c) R(OPS) and ground Extraneous ac voltages during idle open circuit state: (a) T(OPS) and R(OPS); (b) T(OPS) and ground; (c) R(OPS) and ground. Ringing ac voltages during ringing open circuit state: (a) T(OPS) and ground; (b) R(OPS) and ground. (4) Verification of proper application of ringing. (5) Test data as specified in Section 8.8.7. 8.3.8 Comments Test results that comply with the requirements of ANSI/TIA-968-A, 4.4.1.4 as tested here also satisfy the signal power requirements in ANSI/TIA-968-A, 4.5.2.7.1 and 4.5.2.7.2. Refer to 4.4.3 for the definition of non-hazardous voltage source.