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TR41.9.2-05-02-007 Title: Proposal to revise TSB31-C, Section 8.6, Ringdown Voiceband Private Line and Metallic Channel Interface Distribution to: TIA TR41.9.2 Meeting Location: Las Vegas, NV February 7, 2005 Submitting Organization: Cisco Systems, Inc. Contact Tim Lawler Information: Cisco Systems, Inc. 170 West Tasman Dr. San Jose, CA 95134 Phone: (408) 527-0681 Fax: (408) 526-4184 Email: [email protected] Keywords: Part 68, TIA/TSB-31-C 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 Cisco Systems 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 Cisco Systems. Cisco Systems 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 Cisco Systems other than provided in the copyright statement above. TR41.9.2-05-02-007 8.6 Ringdown Voiceband Private Line and Metallic Channel Interface TIA-968-A, 4.4.1.7 8.6.1 Background Voiceband private lines referred to in this requirement provide a dedicated voice channel with signaling capability between two or more customer premises. The facility may be either two-wire or four-wire and is usually referred to by the type of signaling between locations (points). Thus, there are two-point and multipoint private lines. Twoway ringdown, or simply "ringdown," is one of the signaling methods used for such private lines. The signaling range can be extended by converting to an inband signaling tone referred to as single-frequency signaling. A metallic facility referred to in this requirement is simply a pair or two pairs of wires with no restriction on the type of signaling that can be used. Two-way ringdown relies solely on the application of ringing voltage at either end of the private line for alerting the other end. Battery is not required for voice transmission, but dc monitoring voltage, as defined in Section 8.8.1, may be present. The short circuit limit for both ringdown and metallic private lines is consistent with the maximum current capabilities of most load coils that may be on the line. 8.6.2 Purpose To verify that voltages and currents appearing at ringdown and metallic private line interfaces are not hazardous to personnel or equipment. 8.6.3 Equipment (1) DC current meter SEL# 19. (2) DC voltmeter SEL# 22. NOTE: Refer to Section 5.3 for equipment details. 8.6.4 Equipment States Subject to Test (1) Idle. (2) Talking. (3) Signaling. 8.6.5 Procedure WARNING! ADEQUATE SAFETY PRECAUTIONS SHOULD BE OBSERVED! TR41.9.2-05-02-007 Inspect appropriate circuit diagrams to verify the following: (1) Ringing voltage is applied to the R lead with the T lead grounded for two-wire interfaces; (2) Ringing voltage is simplexed on the T and R leads, and ground is simplexed on the T1 and R1 leads for four-wire interfaces. (3) Perform tests specified in Section 8.8.5 to verify compliance with ringing source requirements in the signaling state. (4) Place EUT in the idle state. (5) Connect dc voltmeter between T lead and ground of the EUT, and measure the voltage, noting polarity. (6) Repeat Step (4) for R lead. (7) Repeat Step (4) and Step (5) for T1 and R1 leads of the EUT if testing a four-wire interface. (8) Repeat Step (3) through Step (6) with EUT in the talking state. (9) Place EUT in idle state. (10) Connect current meter between T and R leads, and measure short circuit current. (11) Repeat Step (9) between T lead and ground and between R lead and ground. (12) Repeat Step (9) for T1 and R1 leads if testing a four-wire interface. (13) Repeat Step (9) through Step (11) for talking state. 8.6.6 Alternative Methods None suggested. 8.6.7 Suggested Test Data Brief written analysis of observed ringing circuit arrangements verifying the following: (i) ringing is used for alerting only, (ii) ringing voltage is applied to R lead, and (iii) ringing voltage is simplexed on T and R leads. (1) DC voltages during idle and talking states: (a) T to ground; TR41.9.2-05-02-007 (2) (b) R to ground; (c) T1 to ground; (d) R1 to ground. DC current during idle and talking states: (a) T to R; (b) T to ground; (c) R to ground; (d) T1 to R1; (e) T1 to ground; (f) R1 to ground. 8.6.8 Comments Refer to TIA-968-A Section 4.4.3 for the definition of non-hazardous voltage.