Download 3 Abbreviations, Acronyms, AND definitions

TR41.3.6-03-08-012-L
PN-3-4350.210
Draft 10 – Aug 2003
To be ANSI/TIA-470.210-C
Telecommunications
CPE Terminal Equipment
Resistance and Impedance Performance Requirements for
Analog Wireline Telephones
Formulated under the cognizance of TIA Subcommittee TR-41.3,
Analog and Digital Wireline Terminals
With the approval of TIA Engineering Committee TR-41,
User Premises Telecommunications Requirements
FOREWORD
(This foreword is not part of this standard.)
This document is a TIA/EIA Telecommunications standard produced by Working Group TR-41.3.6
of Committee TR-41. This standard was developed in accordance with TIA/EIA procedural
guidelines, and represents the consensus position of the Working Group and its parent Subcommittee
TR-41.3, which served as the formulating group.
This standard is based on TIA/EIA-470B.
The annexes in this Standard are informative and are not considered part of this Standard.
Suggestions for improvement of this standard are welcome. They should be sent to:
Telecommunications Industry Association
Engineering Department
Suite 300
250 Wilson Boulevard
Arlington, VA 22201
(To be published as TIA-470.210C)
TR41.3.6-03-08-012-L
Draft 10
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The TR-41.3.6 Working Group acknowledges the contribution made by the following individuals
in the development of this standard.
Position
(If Applicable)
Name
Representing
Don McKinnon
AST Technology Labs, Inc.
Chair
Rick Carey
RadioShack
Editor
Dave Stenner
Advent Instruments
Fred Bonhomme
Atlinks
Ken Macdonald
Microtronix Systems Ltd.
Amar Ray
Sprint
Al Baum
Uniden
Steve Whitesell
Vtech
The TR-41.3.6 Working Group, which had the technical responsibility during the development of
this standard, had the following participating members.
Name
Representing
James Bress
AST Technology Labs
Jim McNeill
Atlinks
Clint Pinkham
Atlinks
Roger Hunt
Atlinks
Jim Mazzolini
Casio Communications
Pierluigi Pacciardi
Casio Communications
Rick White
CIDCO Communications
Harry Van Zandt
ESC Technologies
Jimmy Smith
Wyle
Steve Kropp
Vtech Engineering
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TABLE OF CONTENTS
1
SCOPE ___________________________________________________________________ 1
1.1
CATEGORIES OF CRITERIA ________________________________________________ 1
2
3
NORMATIVE REFERENCES ________________________________________________ 2
ABBREVIATIONS, ACRONYMS, AND DEFINITIONS __________________________ 3
3.1
ABBREVIATIONS AND ACRONYMS _________________________________________ 3
3.2
DEFINITIONS ___________________________________________________________ 3
4
RESISTANCE AND IMPEDANCE CHARACTERISTICS ________________________ 4
4.1
REQUIREMENTS CALCULATION MODEL (ADDED 5/6/03) _______________________ 4
4.2
DC FEED CIRCUIT _______________________________________________________ 5
4.3
ON-HOOK RESISTANCE ___________________________________________________ 6
4.3.1
Requirements............................................................................................................. 6
4.3.2
Method of Measurement ........................................................................................... 6
4.4
OFF-HOOK RESISTANCE __________________________________________________ 8
4.4.1
DC Resistance ........................................................................................................... 8
4.4.1.1
4.4.1.2
4.5
Requirements .............................................................................................................................. 8
Method of Measurement ............................................................................................................. 9
ON-HOOK IMPEDANCE __________________________________________________ 10
4.5.1
DC Current During Ringing .................................................................................... 11
4.5.1.1
4.5.1.2
4.5.2
Metallic Impedance During Ringing 5/6 change ................................................... 13
4.5.2.1
4.5.2.2
4.5.3
Requirements ............................................................................................................................ 16
Method of Measurement ........................................................................................................... 16
On-Hook Metallic Impedance (5 to 200 Hz, 1 to 10 V rms) ................................... 17
4.5.5.1
4.5.5.2
4.5.6
Requirements 5/6 change .......................................................................................................... 15
Method of Measurement ........................................................................................................... 15
Longitudinal Impedance for AC Power Induction From Power Lines ................... 16
4.5.4.1
4.5.4.2
4.5.5
Requirement .............................................................................................................................. 13
Method of Measurement ........................................................................................................... 14
Longitudinal Impedance During Ringing................................................................ 15
4.5.3.1
4.5.3.2
4.5.4
Requirements ............................................................................................................................ 11
Method of Measurement ........................................................................................................... 12
Requirement .............................................................................................................................. 17
Method of Measurement ........................................................................................................... 17
In-Band On-Hook Metallic Impedance (200 to 3200 Hz)....................................... 18
4.5.6.1
4.5.6.2
Requirement .............................................................................................................................. 18
Method of Measurement ........................................................................................................... 18
4.6
OFF-HOOK METALLIC IMPEDANCE (RETURN LOSS)__________________________ 19
4.6.1
Requirements........................................................................................................... 19
4.6.2
Method of Measurement ......................................................................................... 19
4.7
LONGITUDINAL BALANCE _______________________________________________ 21
4.7.1
Requirement ............................................................................................................ 21
4.7.2
Method of Measurement ......................................................................................... 21
ANNEX A
ANNEX B
(INFORMATIVE) – SCALED ON-HOOK PERFORMANCE LIMITS
BASED ON CPE QUANITY CONNECTED AT THE CI ____________ 23
(INFORMATIVE) – ISO R-40 FREQUENCIES ____________________ 24
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Table of Figures
Figure 1 – DC Feed Circuit ................................................................................................................. 5
Figure 2 – On-Hook Resistance Requirements ................................................................................... 6
Figure 3 – On-Hook Resistance Tip-to-Ring ...................................................................................... 7
Figure 4 – On-Hook Resistance Tip with Ring grounded, Ring with Tip grounded .......................... 7
Figure 5 – V vs. I Characteristic Requirements .................................................................................. 8
Figure 6 – Off-Hook Resistance test setup.......................................................................................... 9
Figure 7 – DC Current during Ringing Requirements ...................................................................... 11
Figure 8 – DC Current during Ringing test setup ............................................................................. 12
Figure 9 – Metallic Impedance Requirements .................................................................................. 13
Figure 10 – Metallic Impedance during Ringing test setup .............................................................. 14
Figure 11 – Longitudinal Impedance during Ringing test setup ....................................................... 15
Figure 11 – Longitudinal Impedance for AC Power Induction From Power Lines test setup .......... 16
Figure 12 – On-Hook Metallic Impedance Requirements ................................................................ 17
Figure 13 – On-Hook Metallic Impedance (200 to 3200 Hz) Requirements .................................... 18
Figure 14 - Return Loss Requirements.............................................................................................. 19
Figure 15 – Return Loss Test Circuit ................................................................................................ 20
Figure 16 - Longitudinal Balance Acceptability- .............................................................................. 21
Figure 17 – Recommended Longitudinal Balance Test Setup .......................................................... 22
Table of Tables
Table 1 –Simulated Ringing Test Signal Matrix............................................................................... 10
Table 2 - AC Power Induction Test Signal Matrix ........................................................................... 16
Table 3 - Scaled On-Hook Performance From Recommended Limits ............................................. 23
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SCOPE
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1.1
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2. Recommended requirements are designated by the terms “should” and “should not”. These
requirements generally relate to compatibility or performance advantages towards which future
designs should strive.
This standard establishes criteria and procedures for evaluating the Resistance and Impedance
requirements of analog terminal performance. The recommended on-hook requirements are written
with a model of 5 CPE attached to the CI and the minimum performance requirements are based on a
model of 3 CPE.
Several performance measurement procedures are established today, each of which yields
standardized measurement data that may be used for the comparison of different products. This
document may only reference a single procedure, however the intent is not to be all-inclusive. Any
measurement procedure that can result in an identical measurement is considered valid.
While the procedures may call out specific test points within the requirements, the full range of the
requirements take precedent over the test method.
CATEGORIES OF CRITERIA
Two types of requirements are specified in this standard; Mandatory and Recommended.
1. Mandatory requirements are designated by the terms “shall” and “shall not”.
requirements are used to indicate conformity in which no deviation is permitted.
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These
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2
NORMATIVE REFERENCES
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2. TIA/EIA-TSB31-B-1998, Part 68 Rational and Measurement Guidelines.
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3. ANSI T1.401-2001, Network-to-Customer Installation Interfaces – Analog Voicegrade Switched
Access Lines Using Loop-Start and Ground-Start Signaling.
The following standards contain provisions, which, through reference in this text, constitute
provisions of this Standard. At the time of publication, the editions indicated were valid. All
standards are subject to revision, and parties to agreements based on this Standard are encouraged to
investigate the possibility of applying the most recent editions of the standards indicated below.
ANSI and TIA maintain registers of currently valid national standards published by them.
1. ANSI/TIA-968-A-2002, Telecommunications Telephone Terminal Equipment Technical
Requirements for Connection of Terminal Equipment to the Telephone Network.
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3 ABBREVIATIONS, ACRONYMS, AND DEFINITIONS
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3.1
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CPE
Customer Premises Equipment
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CI
Customer Interface
PN-3-4350.210
ABBREVIATIONS AND ACRONYMS
For the purposes of this Standard, the following abbreviations and acronyms apply.
CO
Central Office (Used broadly to describe the telephone switch connected to a
subscriber’s line)
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@@@ Check for missing abbr & acronyms, check against acoustics and CID
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3.2
DEFINITIONS
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Line In-Use:
A state of the CPE line when at least one CPE is Off-Hook.
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51
Line State:
The condition of the Tip-to-Ring interface. It can be either In-Use or
Idle.
52
Off-Hook:
Refers to the state of a particular CPE rather than the line state.
53
On-Hook:
Refers to the state of a particular CPE rather than the line state.
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55
Return Loss
Off-Hook Metallic AC Impedance measured against 600 ohms in
series with 2.2uF.
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Metallic Impedance
Impedance measured between Tip-to-Ring
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Longitudinal Balance
Performance Balance, a Longitudinal signal converted to Metallic
signal in the phone that the user will perceive as a performance
problem
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Transverse Balance
Harms Balance (FCC transverse balance): Metallic to Longitudinal
that may cause interference on the network.
For the purposes of this Standard, the following definitions apply.
Line Idle:
A state of the CPE line when all connected CPE are On-Hook.
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RESISTANCE AND IMPEDANCE CHARACTERISTICS
REQUIREMENTS CALCULATION MODEL (ADDED 5/6/03)
TIA-968-A states the regulatory requirements for dc resistance, dc current during ringing and ac
impedance during ringing are pertaining to “individual equipment”, or a single CPE. It should be
noted that if the CPE meets, but does not exceed, the minimum regulatory requirements for one of
the above, then only one CPE may be connected to the Customer Interface (CI).
Typically the CI has more than one CPE attached, i.e. Multiple Telephones, PC Modem, Alarm
System, Set Top Box (satellite box), etc. As such, the recommended on-hook requirements in this
standard are written with the expectation that up to 5 CPE may be attached to the CI and the
minimum performance requirements are based on a 3 CPE model. For specific applications where
more CPE are expected to be attached, i.e. KSU-less systems, the on-hook performance limits need to
be scaled. See Annex A for an example of scaled calculations.
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4.2
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DC FEED CIRCUIT
The DC feed circuit must supply the CPE power and interface to test equipment such that the
required parameters may be measured without introducing any significant error. In this standard the
DC feed shall provide the following and where applicable one percent tolerance:
• 50 Vdc in series with 400 ohms
• less than 0.1 dB insertion loss over a 100 Hz to 10 kHz range into a 600 ohm load
• 900-ohm termination impedance
• at least 30 dB return loss with respect to 900 ohms over a 300 Hz to 10 kHz range.
Note: 750 ohms and 1250 ohms may be added to the DC feed resistance to simulate line
resistance associated with 2.7km and 4.6km 26AWG lines.
C
L
R
from source
or
to termination
50 V
to CPE
R
L
C
88
89
C >= 100 uF
L >= 5 H
R = 200 ohms (including resistance of L)
V = 50 V
Figure 1 – DC Feed Circuit
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4.3
ON-HOOK RESISTANCE
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The should should requirements are extracted from TIA-968-A On-Hook Impedance Limitations.
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4.3.1 Requirements
1. The Tip-to-Ring On-Hook DC resistance shall conform to Figure 2.
2. In addition, if the CPE has accessible metal parts (with the exception of charge contacts) the OnHook resistance between Tip with Ring grounded, Ring with Tip grounded shall conform to
Figure 2. All accessible metal parts shall be connected to ground for the duration of the test.
> Shall Limit
> Should Limit
10,000,000
5M
W
Acceptable Region
(no maximum limit)
3M
W
Resistance W
1,000,000
100,000
30 k
W
Unacceptable Region
18 k
W
10,000
0
20
40
60
80
101
102
103
104
105
106
107
108
120
140
160
180
200
DC Voltage
99
100
100
Figure 2 – On-Hook Resistance Requirements
4.3.2 Method of Measurement
1. For Tip-to-Ring, connect the CPE as shown in Figure 3, measure DC current and voltage then
calculate the resistance of the CPE.
2. For Tip with Ring grounded, Ring with Tip grounded , connect the CPE as shown in, Figure 4
3. Measure the DC current and voltage then calculate the resistance of the CPE.
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1K
NOTE
A
T
0 - 200
V DC
V
S1
CPE
R
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110
111
112
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NOT E: T he 1k ohm resistor is provided as a current limiter.
Note: The 1k ohm resistor is provided as a fail safe current limiter in case the CPE goes Off-Hook
during testing.
Figure 3 – On-Hook Resistance Tip-to-Ring
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1K
NOTE
A
T
0 - 200
V DC
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V
S1
CPE
R
connect to all accessible
metal parts except
charge contacts
NOT E: T he 1k ohm resistor is provided as a current limiter.
Note: The 1k ohm resistor is provided as a fail safe current limiter in case the CPE goes Off-Hook
during testing.
Figure 4 – On-Hook Resistance Tip with Ring grounded, Ring with Tip grounded
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4.4
OFF-HOOK RESISTANCE
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4.4.1 DC Resistance
4.4.1.1 Requirements
The voltage vs. current (V-I) characteristic of a telephone in all off-hook operating states shall be in
the Acceptable Region of Figure 5.
25
Unacceptable Region
47.5 mA
20
19 V
83.75 mA
T&R DC Volts .
400 W slope
Undefined
Region
15
Acceptable
Region
10 V
106.5 mA
10
8V
7V
5
Complex Resistance Slopes
4V
Unacceptable Region
200 W slope
0
0
10
40
50
60
70
80
90
100
110
120
Figure 5 – V vs. I Characteristic Requirements
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30
Loop I (mA)
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20
Notes:



The 19V upper limit used is required to determine line status for the Line-In-Use
feature.
The Undefined Region falls outside of the known CO operating parameters.
The lower Unacceptable Region is for allowing parallel phone operation.
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4.4.1.2 Method of Measurement
The following steps shall be taken:
1. Connect the CPE as shown in Figure 6.
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2. Measure the current vs. voltage as per Figure 5 and repeat for reverse polarity and all Off-Hook
operating states.
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A
DC
FEED
CIRCUIT
T
V
S1
R
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140
CPE
Figure 6 – Off-Hook Resistance test setup
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(To be published as TIA-470.210C)
ON-HOOK IMPEDANCE
The following test matrix is referred to in a number of the following sub-sections and relates to a Btype ringer as defined in TIA-968-A.
Table 1 –Simulated Ringing Test Signal Matrix
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Draft 10
Signal
Frequency (Hz)
Level (Vrms)
Bias (Vdc)
1
20
90
50
2
15.3
40
0
3
15.3
130
80
4
34
40
0
5
34
62
50
6
34
130
80
7
49
62
0
8
49
130
50
9
49
150
80
10
68
62
0
11
68
150
80
NOTE: T1.401-2000 network interface standard has eliminated all ringing signals except 20
Hz A-Type ringing. This was done to eliminate out-dated requirements based on old
electromechanical switching systems. B-Type ringing impedance requirements may
be eliminated in the future.
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4.5.1 DC Current During Ringing
This requirement is to ensure that the total DC current of all connected CPE during ringing does not
cause false off-hook detections by the CO (ring trip).
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4.5.1.1 Requirements
During the applications of simulated ringing as listed in Table 1, the total dc current flowing between
Tip-to-Ring conductors shall be in the acceptable region shown in Figure 7
< Should Limit
< Shall Limit
1.6
1.4
Unacceptable Region
1.2
DC mA
1.0
0.8
15.3 Hz
0.6
68 Hz
Acceptable Region
(no maximum limit)
0.4
0.2
0.0
10
Frequency (Hz)
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Figure 7 – DC Current during Ringing Requirements
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4.5.1.2 Method of Measurement
The following steps shall be taken:
1. Connect the CPE to the test circuit as shown in Figure 5.
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2. Record the dc current reading on the ammeter for the items in Table 2.
RINGING
AMPLIFIER
FREQUENCY
GENERATOR
ADC
T
VAC
S1
CPE
R
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168
169
170
171
172
173
174
Figure 8 – DC Current during Ringing test setup
Circuit Performance requirements:
 All circuit nodes should have an impedance with respect to ground of  500k ohm.
 AC – AC generator 10 Hz – 700 Hz
 DC – DC bias supply range of +/- 80V
 V – True RMS Voltmeter
 I – DC current Meter
 The source impedance should be lower than 900 ohms
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4.5.2 Metallic Impedance During Ringing 5/6 change
4.5.2.1 Requirement
During the applications of simulated ringing signals listed in Table 1, the Tip-to-Ring impedance
shall in the acceptable region shown in Figure 9
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Notes:
1. The minimum impedance of the CPE in the frequency range below prevents central office
false ring trip.
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2. REN is calculated per the following: REN = 8000/Measured Z
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Figure 9 – Metallic Impedance Requirements
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4.5.2.2 Method of Measurement
Connect the CPE to the test circuit shown in Figure 10 and for each test signal in Table 1, measure
the AC voltage and AC current and then calculate the Tip-to-Ring impedance.
RINGING
AMPLIFIER
FREQUENCY
GENERATOR
AAC
T
VAC
S1
CPE
R
192
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194
195
196
197
198
199
200
201
202
Figure 10 – Metallic Impedance during Ringing test setup
Circuit Performance requirements:
 All circuit nodes should have an impedance with respect to ground of  500k ohm.
 AC – AC generator 10 Hz – 700 Hz
 DC – DC bias supply range of +/- 80V
 V – True RMS Voltmeter
 I – DC current Meter
 The source impedance should be lower than 900 ohms
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4.5.3 Longitudinal Impedance During Ringing
4.5.3.1 Requirements 5/6 change
If the CPE has accessible metal parts (with the exception of charge contacts) the On-Hook impedance
between Tip with Ring grounded, Ring with Tip grounded , during the application of the simulated
ringing signals listed in Table 1, shall be 100 kW. All accessible metal parts shall be connected to
ground for the duration of the test.
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4.5.3.2 Method of Measurement
Connect the CPE to the test circuit shown in Figure 11 and for each test signal in Table 1, measure
the AC voltage and AC current and then calculate the impedance Tip with Ring grounded, Ring with
Tip grounded .
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RINGING
AMPLIFIER
FREQUENCY
GENERATOR
AAC
T
VAC
S1
R
connect to all accessible
metal parts except
charge contacts
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218
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220
221
222
223
224
225
CPE
Figure 11 – Longitudinal Impedance during Ringing test setup
Circuit Performance requirements:
 All circuit nodes should have an impedance with respect to ground of  500k ohm.
 AC – AC generator 10 Hz – 700 Hz
 DC – DC bias supply range of +/- 80V
 V – True RMS Voltmeter
 I – DC current Meter
 The source impedance should be lower than 900 ohms
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4.5.4 Longitudinal Impedance for AC Power Induction From Power Lines
4.5.4.1 Requirements
If the CPE has accessible metal parts or connection to the AC mains, the Tip with Ring grounded,
Ring with Tip grounded impedance over the frequency range 70 to 660 Hz for voltages up to 50 V
rms shall be > 20 kW.
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4.5.4.2 Method of Measurement
Connect the CPE to the test circuit shown in Figure 11 and for each test signal in Table 2, measure
the AC voltage and AC current and then calculate the impedance Tip with Ring grounded, Ring with
Tip grounded .
Frequency
Generator
Ringing
Amplifier
AAC
T
VAC
CPE
To AC Power
R
S1
connect to all accessible
metal parts except
charge Contacts
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Figure 12 – Longitudinal Impedance for AC Power Induction From Power Lines test setup
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Table 2 - AC Power Induction Test Signal Matrix
Signal
Frequency (Hz)
1
70
2
90
3
120
4
180
5
240
6
300
7
360
8
420
9
480
10
540
11
600
12
660
Level (Vrms)
50
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4.5.5 On-Hook Metallic Impedance (5 to 200 Hz, 1 to 10 V rms)
4.5.5.1 Requirement
The impedance for frequencies from 5 to 200 Hz shall be in the acceptable region shown in Figure 13
for voltages from 1 to 10 V rms across the CPE.
> Should Limit
> Shall Limit
100,000
Acceptable Region
(no maximum limit)
5Hz,50 kW
Impedance
W
30 kW
15Hz, 11 kW
10,000
20Hz,7 kW
6.6 kW
30Hz,5 kW
4.2 kW
3 kW
Unacceptable Region
50-200Hz,3 kW
1.8 kW
1,000
1
246
10
100
1000
Frequency (Hz)
247
Figure 13 – On-Hook Metallic Impedance Requirements
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250
251
4.5.5.2 Method of Measurement
Connect the CPE to the test circuit shown in Figure 10 and measure the AC voltage and AC current
and then calculate the Tip-to-Ring impedance.
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4.5.6 In-Band On-Hook Metallic Impedance (200 to 3200 Hz)
4.5.6.1 Requirement
The In-Band impedance for frequencies from 200 to 3200 Hz shall be in the acceptable region of
Figure 14 for 1 Vrms across the CPE.
257
258
Figure 14 – On-Hook Metallic Impedance (200 to 3200 Hz) Requirements
259
260
261
262
4.5.6.2 Method of Measurement
Connect the CPE to the test circuit shown in Figure 10 and measure the AC voltage and AC current
and then calculate the Tip-to-Ring impedance.
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263
4.6
OFF-HOOK METALLIC IMPEDANCE (RETURN LOSS)
264
265
266
267
268
4.6.1 Requirements
The Off-Hook metallic impedance of the CPE shall meet the following requirements:
1. The Return Loss shall be in the acceptable region of Figure 15 when measured against 600 W in
series with 2.2 F. This requirement applies during all off-hook operating states, including, for
example, Hold and Mute.
269
270
2. The calculated Echo Return Loss (ERL) shall be greater than 8 dB over a frequency band of 500
to 2500 Hz when measured against 600 W in series with 2.2 F.
10
Acceptable Region
(no maximum limit)
9
8
2500 Hz
500 Hz
7
dB
6
5
4
3500 Hz
200 Hz
3
Unacceptable Region
2
1
0
1000
100
10000
Frequency (Hz)
271
272
Figure 15 - Return Loss Requirements
273
274
275
4.6.2 Method of Measurement
The following steps shall be taken:
1. Connect the CPE to the test circuit as shown in Figure 16.
276
2. Set the total DC feed resistance to 400W.
277
278
3. Setup the CPE to not transmit any signals in the off-hook mode. (Signals from the handset
transmitter may interfere with the measurement.) Room background noise shall be < 30 dBA.
279
280
4. Step the signal generator frequency from 200 to 3550 Hz, using R40 Frequencies (see Annex B).
At each frequency measure Va and Vb.
281
5. Calculate the Return Loss at each frequency, RL (fi).
282

 Va 
RL ( fi)  20 Log 

 2V b 
283
284
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285
286


288
291
292
(To be published as TIA-470.210C)
6. The Echo Return Loss is calculated as a power average over a log frequency scale. The ERL is
only required for the talk state:
287
289
290
Draft 10
 N 
 fi   
ERL  146
.  10 Log     A i  A ( i  1)  Log 
   dB
 f ( i  1)   
 i1 
where: f0 = 500 Hz, fN = 2500 Hz, and Ai  10
  RLi 


 10 
7. Set the total DC Feed resistance to 1150W and repeat steps 3 to 7.
8. Set the total DC Feed resistance to 1650W and repeat steps 3 to 7.
Zr
Cr
Rr
G1
Va
DC Feed Circuit
R1
Vb
R1
293
294
295
296
297
298
299
Legend
Rr
= 600 W  1%
Cr
= 2.2 F  5%
G1
= Signal Generator, 200 to 3500 Hz, -10 dBV
R1
= 600 W  0.1%
Figure 16 – Return Loss Test Circuit
20
DUT
(To be published as TIA-470.210C)
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Draft 10
PN-3-4350.210
300
4.7
LONGITUDINAL BALANCE
301
302
303
304
4.7.1 Requirement
The CPE shall meet or exceed the minimum longitudinal balance requirements as shown in Figure 17
in the On-hook operating state and in all Off-hook operating states. The longitudinal balance
coefficient in dB is expressed as:
BALANCE L-M  20 log 10
305
EL
EM
306
where EL is the applied longitudinal voltage and EM is the resultant metallic voltage.
307
308
4.7.2
Method of Measurement
Off-Hook < Limits
On-Hook < Limits
-20
Unacceptable Region
-30
200 Hz
dB
-40
4000 Hz
Acceptable Region
Off-Hook
(no minimum limit)
-50
-60
Acceptable Region On-Hook
(no minimum limit)
-70
-80
100
309
310
1000
Frequency (Hz)
Figure 17 - Longitudinal Balance Acceptability-
311
21
10000
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(To be published as TIA-470.210C)
100 F
TIP
2
S1
R1
368 W
1
I
R4
3K
R3
250k W
B1
48 V
L1
20H
R2
368 W
EL
100 F
EM
Equipment
under
test
RING
Exposed
conductive
surfaces
Ground Plane
312
313
Figure 18 – Recommended Longitudinal Balance Test Setup
314
315
(@@@ Remove DC feed circuit listed and add black box)
(@@@ Change R1 & R2 to just R1 and 301 ohms 0.1%)
316
317
318
319
320
321
322
323
324
325
(@@@ Add Calibration procedure – Amar (Check IEEE-455 about calibrating the test circuit)
(@@@ Investigate new circuit design, transformer-based)
Notes:
 All values 1% unless otherwise noted
 Harms Balance (FCC transverse balance): Metallic to Longitudinal that may cause
interference on the network.
 Performance Balance: Longitudinal signal converted to Metallic signal in the phone that the
user will perceive as a performance problem
.
22
(To be published as TIA-470.210C)
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Draft 10
PN-3-4350.210
(INFORMATIVE) – SCALED ON-HOOK PERFORMANCE LIMITS BASED ON
CPE QUANITY CONNECTED AT THE CI
Typically the Customer Interface (CI) has more than one CPE attached, i.e. Multiple Telephones, PC
Modem, Alarm System, Set top box (satellite), etc. As such, for specific applications where more
CPE are expected to be attached, i.e. KSU-less systems, the on-hook performance limits in this
standard need to be scaled. The following table is provided as an example.
ANNEX A
Table 3 - Scaled On-Hook Performance From Recommended Limits
Number of CPE Connected to CI
Notes
Requirement
Scaling
1
Regulatory basis, not performance related
20%
3 CPE model
Minimum Performance this standard
60%
5 CPE model
Recommended Performance this standard
reference
8
160%
10
200%
12
240%
14
280%
16 (i.e. KSU-less systems)
320%
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ANNEX B
Draft 10
(INFORMATIVE) – ISO R-40 FREQUENCIES
fn
n
n
1
100
41
2
106
42
3
112
43
4
118
44
5
125
45
6
132
46
7
140
47
8
150
48
9
160
49
10
170
50
11
180
51
12
190
52
13
200
53
14
212
54
15
224
55
16
236
56
17
250
57
18
265
58
19
280
59
20
300
60
21
315
61
22
335
62
23
355
63
24
375
64
25
400
65
26
425
66
27
450
67
28
475
68
29
500
69
30
530
70
31
560
71
32
600
72
33
630
73
34
670
74
35
710
75
36
750
76
37
800
77
38
850
78
39
900
79
40
950
80
81
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(To be published as TIA-470.210C)
fn
1000
1060
1120
1180
1250
1320
1400
1500
1600
1700
1800
1900
2000
2120
2240
2360
2500
2650
2800
3000
3150
3350
3550
3750
4000
4250
4500
4750
5000
5300
5600
6000
6300
6700
7100
7500
8000
8500
9000
9500
10000