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Download TR41.9.1-08-08-005_Draft proposed revisions to Defintions
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Telecommunications Industry Association TR41.9.1-08-08-005 Document Cover Sheet Project Number PN-3-0016-RV2 (to become TIA-968-B) Document Title Draft proposed revisions to Definitions clause. Source Verizon Contact Trone Bishop 13100 Columbia Pike Silver Spring, MD 20904 Distribution TR-41.9.1, at interim meeting Intended Purpose of Document (Select one) x Phone: 301-236-3754 Email: [email protected] For Incorporation Into TIA Publication For Information Other (describe) Notices The document to which this cover statement is attached is submitted to a Formulating Group or subelement thereof of the Telecommunications Industry Association (TIA) in accordance with the provisions of Sections 6.4.1–6.4.6 inclusive of the TIA Engineering Manual dated March 2005, all of which provisions are hereby incorporated by reference. This document has been prepared by Verizon to assist TIA Engineering Committee TR-41. It is proposed to the TR41.9 subcommittee as a basis for discussion and is not to be construed as a binding proposal on Verizon. Verizon 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 Verizon other than provided in the copyright statement above. Abstract The subcommittee previously agreed to the goal of removing all instances of the word “shall” from the Definitions clause 3.1 of the draft TIA-968-B document. A few instances of the word ‘shall” still remain. This contribution proposes several changes to eliminate this editorial issue. Telecommunications Industry Association TR41.9.1-08-08-005 1. Local area data channel simulator circuit. Delete the text shown below and add text as shown below to subclause 5.2.1.1. Local area data channel simulator circuit: A circuit for connection in lieu of a Local Area Data Channel to provide the appropriate impedance for signal power tests. The schematic of figure 1.10 is illustrative of the type of circuit that shall be used over the given frequency ranges. When used, the simulator shall be operated over the appropriate range of loop resistance for the equipment under test, under all voltages and polarities that the terminal under test and a connected companion unit are capable of providing. (The deleted text should be moved to 5.2.1.1) 5.2.1.1 Local area data channel interfaces: LADC approved terminal equipment shall comply with the metallic voltage limitations when connected to the LADC simulator circuit shown in figure 1.11 and shall comply with the longitudinal limitations when connected to circuits of figure 4.5, as indicated. The schematic of figure 1.11 is illustrative of the type of circuit that shall be used over the given frequency ranges. When used, the simulator shall be operated over the appropriate range of loop resistance for the equipment under test, under all voltages and polarities that the terminal under test and a connected companion unit are capable of providing. 2. Loop simulator circuit. Delete the text shown below and add text as shown below to subclauses 5.1.7.1.3 and 5.1.7.1.4. Loop simulator circuit: A circuit that simulates the network side of a two-wire or four-wire telephone connection during testing. The required circuit schematics are shown in figure 1.1 for two-wire loop or ground start circuits, figure 1.2 for two-wire reverse battery circuits, figure 1.3 for four-wire loop or ground start circuits, figure 1.4 for four-wire reverse battery circuits, and figure 1.9 for voice band metallic channels. Figure 1.8 is an alternative termination for use in the two-wire loop simulator circuits. Other implementations may be used provided that the same DC voltage and current characteristics and AC impedance characteristics will be presented to the equipment under test as are presented in the illustrative schematic diagrams. When used, the simulator shall be operated over the entire range of loop resistance as indicated in the figures, and with the indicated polarities and voltage limits. Whenever loop current is changed, sufficient time shall be allocated for the current to reach a steady-state condition before continuing testing. (The deleted text should be moved to 5.1.7.1.3 and 5.1.7.1.4) 5.1 7.1.3 Figure 1.1 shows a loop simulator for 2-wire loop-start interfaces that is referenced for several requirements in clauses 4.4 and 5.1. Means shall be used to generate, at the point of tip and ring connections to the terminal equipment or protective circuitry, the parameters of DC line current Telecommunications Industry Association TR41.9.1-08-08-005 and AC impedance that are generated by the illustrative circuit shown in figure 1.1. The loop simulator shall be operated over the entire range of loop resistance as indicated in the figures, and with the indicated polarities and voltage limits. Whenever loop current is changed, sufficient time shall be allocated for the current to reach a steady-state condition before continuing testing. In the transverse balance limitation shown in clause 5.1.6, the use of the "DC portion of the loop simulator circuit" is specified. In such case, components of R1 and C1 shall be removed. The alternative termination in figure 1.3 may be used during signal power compliance testing in place of R1 (600 ohms) in the applicable loop simulator circuit. 5.1.7.1.4 Figure 1.2 defines the loop simulator for 4-wire loop-start or ground-start interfaces that is referenced for several requirements in clauses 4.4 and 5.1 The loop simulator shall be operated over the entire range of loop resistance as indicated in the figures, and with the indicated polarities and voltage limits. Whenever loop current is changed, sufficient time shall be allocated for the current to reach a steady-state condition before continuing testing. 3. Off-premises line simulator. Delete the text shown below and add a reference to 5.1.11.1 which now contains the deleted text. Off-premises line simulator circuit is a load impedance for connection, in lieu of an off-premises station line, to PBX (or similar) telephone system loop start circuits during testing. (See 5.1.11.1)The schematic diagram of figure 1.7 is illustrative of the type of circuit which shall be used; alternative implementations may be used provided that the same DC voltage and current characteristics and AC impedance characteristics of figure 1.7 shall be presented to the equipment under test as are presented in the illustrative schematic diagram. When used, the simulator shall be operated over the entire range of loop resistances as indicated in figure 1.7, and with the indicated polarities. Whenever loop current is changed, sufficient time are allocated for the current to reach a steady-state condition before continuing testing. (The deleted text was moved to 5.1.11.1 by a previous contribution.) 4. Off-premises station (OPS) interface. Revise the text as shown below. Off-premises station (OPS) interface: The point of connection between PBX telephone systems (or similar systems) and telephone company private line communication facilities used to access approved station equipment located off the premises. Equipment leads at this interface are limited to telephone tip and ring leads (designated T(OPS) and R(OPS)) where the PBX employs loop-start signaling at the interface. Unless otherwise noted, all T(OPS) and R(OPS) leads shall be are treated as telephone connections for purposes of fulfilling approval Telecommunications Industry Association TR41.9.1-08-08-005 conditions. 5. PSDS type II analog mode loop simulator circuit. Delete the text as shown below. PSDS type II analog mode loop simulator circuit: A circuit simulating the network side of the two-wire telephone connection that is used for testing terminal equipment to be connected to the PSDS Type II loops. Figure 1.12 shows the type of circuit that shall be used. Other test circuit configurations may be used provided they operate at the same DC voltage and current characteristics and AC impedance characteristics presented in the illustrated circuit. When utilized, the simulator should be operated over the entire range of loop resistances, and with the indicated voltage limits and polarities. Whenever the loop current is changed, sufficient time shall be allowed for the current to reach a steady-state condition before continuing testing. (The deleted text will be added to 5.2.3.4 by another contribution.)