Download TR41.9.1-08-08-005_Draft proposed revisions to Defintions

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.)