Version 2-2
9-State
ADSL “Good Pair” Qualification
This document defines the acceptable loop parameters and the minimum data rates
for each ADSL-based service offered in the AT&T 9-state footprint. Acceptable
parameters are defined for cases where the line can initialize (sync) and for those
cases where it cannot initialize (no sync).
Version 2.2 (RJ2742)
Date: 12/14/2011
Revisions: Updated Profiles chart, line error note, insulation res. T-R
Version 2.1 (RJ2742)
Date: 1/20/2011
Revisions: Updated Bridged Tap: Copper Thresholds
Version 1.3 (RJ2742)
Date: 8/27/2010
Revisions: Updated Code Violations, added link to CV calculator; added data rate verbiage; Corrected IPDSLAM chart on page 14
Version 1.2 (RJ2742)
Date: 7/8/2010
Revisions: Added DC resistance sec 6; updated loop resistance tables; updated IPDSLAM loop limitations; added BT verbiage;
Version 1.1 (RJ2742)
Date: 5/6/2010
Revisions: Added document support contacts and version; updated Noise Margin verbiage
Document Support Contacts:

Lynn Hughes (Network Staff)

Robert Jindra (Network Staff)
9-State ADSL Good Pair Qualification v.2.2
Introduction
This document defines the acceptable loop parameters and the minimum data rates for each ADSL-based
service offered in the AT&T 9-state footprint. Acceptable parameters are defined for cases where the line can
initialize (sync) and for those cases where it cannot initialize (no sync).
In many cases the values recommended here are new and have not been widely communicated to the field
operations work groups. For this reason, the actual values are preceded by explanatory text.
Two new services, 12 and 18 Mbps, are planned with the deployment of the IPDSL platform and the use of
ADSL2plus. Loop limits for these new services and loop limits for existing services, assuming the use of
ADSL2plus, are included in this document.
Thresholds are provided for use at various stages of the trouble-shooting process. For example, if the line can
initialize (sync), the minimum upstream and downstream data rates are provided in Tables 1, 2, & 3. The
actual (current) bit rates may be compared to the minimum values provided in this document. The minimum
data rates are provided for the following sets of services:



Retail services currently offered in 9-states
Wholesale services currently offered in 9-states
Those currently offered and planned for offer via the IPDSL (22-state)
If the data rates are at or above the minimum values, error performance and noise margin thresholds are
provided, which also must be met.
If the line can initialize (sync), but the data rates do not meet the minimum values, the approximate loop length
— in terms of 26 AWG equivalent working length (EWL) — can be assessed using the upstream attenuation.
For this purpose, the maximum upstream attenuation and thresholds are provided in Tables 4, 5, & 6 for the
following configurations:



Retail services provided via conventional access products in 9-states
Wholesale services provided via conventional access products in 9-states
IP DSLAM‘s assuming single-pair ADSL2plus (22-state) (values are provided for both CO and remote
IP DSLAM‘s)
If the line cannot initialize (no sync), dc loop resistance thresholds are provided in Tables 8, 9, 10, & 11. The
dc loop resistance may be measured and compared to these threshold values.
A section is provided on design considerations. The last section deals with insulation resistance, foreign
voltage, and Power Influence.
9-State ADSL ―Good Pair‖ v.2.2
Page 2
9-State ADSL Good Pair Qualification v.2.2
1.
Minimum Data Rates – Assuming the DSL Can Initialize (sync)
If the line can initialize (sync), the current bit rates should be compared to the minimum values in Error!
Reference source not found. through Table below. If the line cannot initialize (no sync), the loop length
should be assessed as covered in section 4.
Note that the minimum data rates for the service are not, in most cases, enforced by the profile. In other
words, for most services, the line can initialize at a rate lower than the minimum data rate for the service.
Table 1 - Minimum Data Rates – 9-State Retail
Product Name
Minimum
Downstream
Data Rate
(kbps)
Up to 6 Mbps – Consumer
Up to 3 Mbps - Consumer
Up to 1.5 Mbps - Consumer
Up to 768 kbps - Consumer
4 – 6 Mbps - Business
2 – 4 Mbps - Business
1.5 Mbps - Business
768 kbps - Business
384 kbps - Business
192 kbps – Business
3040
1568
800
200
4000
2016
1504
768
384
200 1
Minimum
Upstream
Data Rate
(kbps)
128
128
128
128
640
640
512
512
384
192
Table 1
Table 2 - Minimum Data Rates - 9-State Wholesale
Product Name
Minimum
Downstream
Data Rate
(kbps)
Minimum
Upstream
Data Rate
(kbps)
6M x 512k
3M x 384k
1.5M x 256k
256k x 128k (grandfathered)
Bus 4.0M x 640k
Bus 2.0M x 640k
Bus 1.5M x 512k
Bus 768k x 512k
Bus 384k x 384k
3040
1568
200
200
4000
1568
1504
768
384
128
128
128
128
640
640
512
512
384
1
The ‗192 kbps Business Offer‘ was originally intended to accommodate a lower downstream rate of 192 kbps.
This table reflects the lower FCC limit of 200 kbps. Note: These values refer specifically to the data in terms of the rate
made available to ATM cells, not the actual throughput values.
9-State ADSL ―Good Pair‖ v.2.2
Page 3
9-State ADSL Good Pair Qualification v.2.2
Table 2
Table 3 - Minimum Data Rate - T22 IP DSLAM
Generic Product Name
Minimum
Downstream
Data Rate
(kbps)
Minimum
Upstream
Data Rate
(kbps)
12032
6048
3040
1568
800
224
128
128
128
128
128
128
18 Meg
12 Meg
6 Meg
3 Meg
1.5 Meg
768 k
Table 3
Note: These values refer specifically to the data in terms of the rate made available to ATM cells, not the actual
throughput values.
If the minimum values are met or exceeded, the noise margin and error performance should be assessed, as described in
section 3 below. If the minimum values cannot be achieved, the loop length should be assessed. On a line that can
initialize (sync), the upstream attenuation is the best measure of loop length. This is covered in the next section.
9-State ADSL ―Good Pair‖ v.2.2
Page 4
9-State ADSL Good Pair Qualification v.2.2
2.
Maximum Values of Upstream Attenuation
The upstream attenuation is a wideband measure of the difference between the upstream signal level as
transmitted by the CPE and the level as received by the DSLAM. It is highly correlated to the length of the
cable, as expressed in 26 gauge equivalent working length (EWL). In fact, 26 gauge equivalent working length
(EWL) is calculated from DSL in-service data using the upstream attenuation.
Note that the loop length limits, in terms of 26 gauge equivalent working length (EWL), are only provided here
only as a basis for developing the maximum upstream attenuation.
Many cases may be found where lines are working at loop lengths exceeding these values. The maximum
loop lengths provided here are not intended to be used to justify the disconnection of existing lines working at
acceptable levels of performance.
Table 4 - Maximum Upstream Attenuation - 9-State - Retail
Product Name
Max Loop
Length in
LQS
(kft, 26 EWL)
Maximum
Upstream
Attenuation
(dB)
6.5
20
8.0
9.5
11.1
15.0
6.9
8.1
9.3
9.4
12.0
15.0
24
29
33
45
21
24
28
28
36
45
Up to 6 Mbps – Consumer
Up to 6 Mbps – Consumer
(when provided via ADSL2plus)
Up to 3 Mbps - Consumer
Up to 1.5 Mbps - Consumer
Up to 768 kbps - Consumer
4 – 6 Mbps - Business
2 – 4 Mbps - Business
1.5 Mbps - Business
768 kbps - Business
384 kbps - Business
192 kbps – Business
Table 4
9-State ADSL ―Good Pair‖ v.2.2
Page 5
9-State ADSL Good Pair Qualification v.2.2
Table 5 - Maximum Upstream Attenuation - 9-State - Wholesale
Product Name
Max Loop
Length in
LQS
(kft, 26 EWL)
Maximum
Upstream
Attenuation
(dB)
6.5
20
8.0
9.5
11.1
15.0
6.9
8.1
9.3
9.4
12.0
24
29
33
45
21
24
28
28
36
6M x 512k
6M x 512k
(when provided via ADSL2plus)
3M x 384k
1.5M x 256k
256k x 128k (grandfathered)
Bus 4.0M x 640k
Bus 2.0M x 640k
Bus 1.5M x 512k
Bus 768k x 512k
Bus 384k x 384k
Table 5
Table 6 - Maximum Upstream Attenuation - T22 - IP DSLAM
(Values shown for single-pair, customer self-install – assuming the use of ADSL2plus)
CO-Based IP DSLAM
Product Name
MAX Plus (18 Meg)
MAX (12 Meg
Elite (6 Meg)
Pro (3 Meg)
Express (1.5 Meg)
Basic (768k)
Max Loop
Length
(kft, 26 EWL)
4.8
6.4
9.0
10.8
12.1
15.0
Maximum
Upstream
Attenuation
(dB)
14
19
27
32
36
45
RT-Based IP DSLAM
Max Loop
Length
(kft, 26 EWL)
4.1
5.7
8.4
10.5
11.8
14.7
Maximum
Upstream
Attenuation
(dB)
12
17
25
32
35
44
Table 6
3
It is recognized that this limit exceeds the maximum length, specified by CSA Design guidelines, for non –loaded loops served by
DLC. This issue is currently under study.
9-State ADSL ―Good Pair‖ v.2.2
Page 6
9-State ADSL Good Pair Qualification v.2.2
3.
Error Performance and Noise Margin
Error Performance
This document is intended to aid in the assessment of performance at the time of installation or on a trouble
visit. It is not intended to provide guidance into the interpretation of in-service error performance across longer
periods of time. Assessing error performance when at the premises is a necessary step in the testing process.
At a minimum, 5 minutes of error monitoring should be performed by the technician.
For a five-minute period, the calculation (in kbps) for the maximum number of code violations is as follows:
To calculate the maximum number of code violations based on either the upstream or downstream
CURBR values click on the following link: CV Calculator
Downstream Data Rate
(kbps)
Maximum Number of
Code Violations
(measured over a
5-minute interval)
Maximum Number of
Code Violations
(measured over a
15-minute interval in BBT)
0.768
1.5
3.0
6.0 and above
12
25
50
100
36
75
150
300
Note: Some judgment should be exercised when using these thresholds. These thresholds are intended
to detect a poor circuit, even if it may not be performing particularly poorly during the measurement
interval. The state transition criteria used in Optimization (Appendix 1) employs higher error thresholds,
assessed over a longer period of time. If it is known that the error performance in one 5-minute (or even
15-minute) interval is worse than the long-term error performance of the circuit under test, the circuit
should not be considered non-compliant simply on the basis of that single measurement
Noise Margin
The Target Noise Margin is a provisioned value. Note that, with the conversion to margin-based profiles, a line
may be configured to employ 6, 9, or 12 dB of Target Noise Margin in the downstream direction. The higher
values of noise margin are intended to allow the noise margin to remain at acceptable levels, even when the
noise changes considerably due to transient noise events. In other words… For ADSL circuits that have
transient noise (impulse noise) issues, it may be best to move CO based service to a 6 db interleaved or a
9 /12 dB profile or RT based service to an interleaved profile to maintain a “stable” service for the customer.
Immediately after initialization (sync), the noise margin in the downstream direction must meet the minimum
Target Noise Margin2 for the provisioned profile. Reduced values for noise margin may be tolerated after the
circuit has established sync. In other words... The circuit will not attain sync if the minimum Target Noise
Margin is not met, once the circuit is in sync however the DSLAM will tolerate a lower margin (below Target
Noise Margin).
2
In many scenarios, the value of target noise margin actually provisioned on a line may be unavailable to the technician. For this
reason, we use only the lowest value.
9-State ADSL ―Good Pair‖ v.2.2
Page 7
9-State ADSL Good Pair Qualification v.2.2
4.
Loop Limits – If the Line Cannot Initialize (no sync)
The maximum dc resistance results from the assumption of a loop composed only of 26 AWG cable. While
coarser gauges result in longer acceptable loop lengths, the dc resistance of such loops is lower than that of a
solid 26-AWG loop. Note the dc resistance of a 15 kft loop of 26 AWG cable slightly exceeds 1300 Ω at 90° F.
Since 1300 Ω is the maximum value of loop resistance allowed under Resistance Design rules, that is the
value shown in the table.
If the line cannot initialize (no sync), the dc loop resistance should be measured and compared to the values
below. The thresholds for maximum length, as inferred from a capacitance measurement, are provided for
information only. Diagnostic tests employing these thresholds are not proposed as a routine measure.
Table 8 - Maximum Loop Lengths - 9-State - Retail
Product Name
Max Loop Length
in LQS (kft, 26
EWL)
Maximum dc
loop
resistance
(70° F) 6
(Ω)
Maximum 7
length
inferred from
capacitance
measurement
(kft)
6.5
540
10.2
8.0
670
12.5
9.5
11.1
15.0
6.9
8.1
9.3
9.4
12.0
15.0
790
930
1250
580
680
780
780
1000
1250
14.8
17.3
18.0
10.8
12.7
14.5
14.7
18.0
18.0
Up to 6 Mbps – Consumer
Up to 6 Mbps – Consumer (when provided via
ADSL2+)
Up to 3 Mbps – Consumer
Up to 1.5 Mbps – Consumer
Up to 768 kbps – Consumer
4 – 6 Mbps – Business
2 – 4 Mbps – Business
1.5 Mbps – Business
768 kbps – Business
384 kbps – Business
192 kbps – Business
Table 8
9-State ADSL ―Good Pair‖ v.2.2
Page 8
9-State ADSL Good Pair Qualification v.2.2
Table 9 - Maximum Loop Lengths - 9-State - Wholesale
Product Name
6M x 512k
6M x 512k (when provided via ADSL2+)
3M x 384k
1.5M x 256k
256k x 128k (grandfathered)
Bus 4.0M x 640k
Bus 2.0M x 640k
Bus 1.5M x 512k
Bus 768k x 512k
Bus 384k x 384k
Max Loop
Length in
LQS
(kft, 26 EWL)
Maximum dc
loop
resistance
(70° F)6
(Ω)
Maximum 7
length inferred
from
capacitance
measurement
(kft)
6.5
8.0
9.5
11.1
15.0
6.9
8.1
9.3
9.4
12.0
540
670
790
930
1250
580
680
780
780
1000
10.2
12.5
14.8
17.3
18.0
10.8
12.7
14.5
14.7
18.0
Table 9
Table 10 - Maximum Loop Lengths – T22 – CO-based IP DSLAM
(Values shown for single-pair installations – assuming the use of ADSL2plus)
Generic
Product
Name
18 Meg
12 Meg
6 Meg
3 Meg
1.5 Meg
768 k
Max Loop
Length
(kft, 26 EWL)
Maximum
dc loop
resistance
(70° F)
(Ω
Maximum
length
inferred from
capacitance
measurement
(kft)
4.8
6.4
9.0
10.8
12.1
15.0
400
540
760
900
1010
1250
7.5
10.0
14.1
16.9
18.0
18.0
Table 10
9-State ADSL ―Good Pair‖ v.2.2
Page 9
9-State ADSL Good Pair Qualification v.2.2
Table 1 Maximum Loop Lengths – T22 – Remotely-based IP DSLAM
(Values shown for single-pair installations – assuming the use of ADSL2plus)
Generic
Product
Name
18 Meg
12 Meg
6 Meg
3 Meg
1.5 Meg
768 k
Max Loop
Length
(kft, 26 EWL)
Maximum
dc loop
resistance
(70° F) (Ω)
Maximum
Error!
Bookmark
not defined.
length
inferred from
capacitance
measurement
(kft)
4.1
5.7
8.5
10.5
11.8
14.7
340
480
710
880
990
1230
6.4
8.9
13.3
16.4
18.0
18.0
Table 11
9-State ADSL ―Good Pair‖ v.2.2
Page 10
9-State ADSL Good Pair Qualification v.2.2
5.
Design Considerations
Bridged Tap
While bridged tap is known to negatively impact DSL performance, the maximum engineered length of bridged
tap is currently dictated by loop design rules, not by DSL considerations. It is currently limited by engineering to
6000 ft. A long bridged tap will reduce signal level about 3 dB across the spectrum. Short bridge taps will act
as a tuned filter, and can have devastating effect on the ADSL band. For example… a 400 foot bridge tap on a
15 kft loop will reduce the downstream attainable rate from about 1000 kb/s to about 256 kb/s. If you encounter
a loop that, by resistance and length measurements, should sync up at a good rate and good margins, but
does not, odds are you have some impairment due to interference or bridged tap. Bridged tap may need to be
removed for service to perform properly.
Loading
Pairs employed for DSL cannot be loaded.
Use of Coarse-gauge cable
The table(s) above portrays loop limits in terms of 26 AWG Equivalent Working Length (EWL). To calculate
the EWL, multiply the length of 24 AWG cable by 0.8, and the length of 22 AWG cable by 0.64. Loop lengths
of 18 kft or more must be loaded in order to ensure that VF insertion loss and attenuation distortion
requirements are met. We do not separately inventory POTS loops from DSL loops. Even if unloaded, DSL
performance on a loop — having length greater than 18 kft — would be marginal at best. For both reasons, a
loop length greater than 18 kft should not be employed for DSL.
DC Loop Resistance
The dc loop resistance of a pair shall not exceed 1300 Ω at the worst-case temperature. This limit is based
on historical POTS Resistance Design rules. DSL was developed, and has been optimized, to perform across
the spectrum of non-loaded loops meeting such criteria. The likelihood of poor performance increases
significantly beyond this limit.
Worst-case temperatures will vary by geography. We do not provide here statistics regarding worst-case
temperatures. Instead, we simply report that using the following worst-case temperature assumptions in the
design process will yield acceptable levels of DSL performance.
The following table provides values of dc loop resistance (per kft) at these temperatures for the 4 commonlyused gauges of cable.
Buried / Underground
Aerial
(/kft) 90F
(/kft) 120F
19
17.2
18.3
22
34.4
36.6
24
54.8
58.2
26
87.1
92.6
Cable Gauge
(/kft) 70F
83.3
Note: DC loop resistance should be measured from the NID/ONI to the Central Office Frame. Pair must be
shorted at the far end to measure loop resistance.
9-State ADSL ―Good Pair‖ v.2.2
Page 11
9-State ADSL Good Pair Qualification v.2.2
6.
Insulation Resistance, Leakage, etc.
Note that the values recommended here differ from, and are more stringent than, those typically used in
support of voiceband (POTS) telecommunications. These values represent our best judgment regarding both
the loop lengths used in support of DSL and the degree to which an ADSL may be impaired while providing
acceptable service.
Insulation Resistance
The dc insulation resistance, tip-to-ring, shall be at least 1.0 MΩ. The dc insulation resistance, measured both
tip-to-ground and ring-to-ground, shall be at least 2 MΩ.
Foreign Voltage
The foreign dc voltage shall be measured, from either conductor to ground, with a voltmeter having a
resistance of 100,000 Ω. As an objective, the foreign dc voltage should be 5.0 Vdc or less. The foreign ac
voltage, when measured from either conductor to ground with a voltmeter having a resistance of 100,000 Ω
and with the far end not terminated, should be 5.0 Vac or less. Note that lower values (5-10 Vac) of induced
AC voltage while undesirable would not fail the circuit from being turned up. *For values of >50Vac contact a
transmission engineer.
Power Influence
While not directly applicable to DSL, this measurement provides insight into the overall effectiveness of
bonding and grounding in the area. The Power Influence, when measured using the „Noise to Ground‟
configuration in IEEE-743, shall not exceed 80 dBrnC.
* For in-depth transmission testing the technician should contact the regional “Transmission Engineer” for
troubleshooting steps.
Circuit Noise
The following is not directly applicable to DSL, but is provided for those cases where the voice performance on
line-share DSL is of interest.
Noise shall be measured at the NID via the use of a ‗quiet termination‘ in the CO. The inside wire shall be
disconnected. The test set shall be set to make a terminated measurement, with the impedance set to 600 Ω.
In no case shall the noise exceed 30 dBrnC. As an objective, the noise should not exceed 20 dBrnC.
Longitudinal Balance
Longitudinal balance, when measured using the method ‗PI – Circuit Noise‘ (see above) shall be at least 60
dB.
When using the ‗Stress‘ test on the Tempo Sidekick, the set injects a longitudinal signal (with a very low
metallic-mode component) at 90 dBrnC. The noise resulting from longitudinal imbalance shall not exceed 30
dBrnC.
9-State ADSL ―Good Pair‖ v.2.2
Page 12
9-State ADSL Good Pair Qualification v.2.2
Copper Test Parameter
TIP-RING VOLTS DC
RING-GROUND VOLTS DC
TIP-GROUND VOLTS DC
TIP-RING VOLTS AC
RING-GROUND VOLTS AC
TIP-GROUND VOLTS AC
TIP-RING RESISTANCE
RING-GROUND RESISTANCE
TIP-GROUND RESISTANCE
METALLIC/CIRCUIT NOISE
POWER INFLUENCE
LONGITUDINAL BALANCE
BALANCE (PI-N) aka noise balance
SIDEKICK STRESS
LOAD COILS
9-State ADSL ―Good Pair‖ v.2.2
units
v (dc)
v (dc)
v (dc)
v (ac)
v (ac)
v (ac)
ohms Ω
ohms Ω
ohms Ω
dBrnC
dBrnC
dB
dB
dBrnC
──
acceptable
marginal
unacceptable
0 to 3
3.1 to 5
>5
0 to 3
3.1 to 5
>5
0 to 3
3.1 to 5
>5
0 to 3
3.1 to 5
>5
0 to 4
4.1 to 6
>6
0 to 4
4.1 to 6
>6
≥2.5MΩ
1MΩ to 2.4MΩ
<1MΩ
≥3.5MΩ
2MΩ to 3.4MΩ
<2MΩ
≥3.5MΩ
2MΩ to 3.4MΩ
<2MΩ
<20
20 TO 30
>30
<80
>80
>60
50 to 59
<50
>60
50 to 59
<50
>20
21 to 30
>30
Load coils must be removed for ADSL service
Page 13
9-State ADSL Good Pair Qualification v.2.2
The table below lists the profiles used in T9 and some of the parameter values defined by the profile. Note that
the actual profile contains many more parameters and values, and is specific to the hardware. Note that the
names of the profiles listed here are the abstract names used in BBNMS and not the names of the profiles in
the EMS or element.
Profiles used in T9
Name
Fast /
Interleaved
768KProfile1
768KProfile2
768KProfile3
1.5MegProfile1
1.5MegProfile2
Fast
Interleaved
Interleaved
Fast
Interleaved
(Medium)
Interleaved
Fast
Interleaved
(Medium)
Interleaved
Interleaved
Fast
Interleaved
(Medium)
Interleaved
Interleaved
1.5MegProfile3
3MegProfile1
3MegProfile2
3MegProfile3
3MegProfile4
ADSLMaxSync1
ADSLMaxSync2
ADSLMaxSync3
ADSLMaxSync4
Min
DS
Rate
(kbps)
Max
DS
Rate
(kbps)
DS
TNMR
(dB)
Min
US
Rate
(dB)
Max
US
Rate
(dB)
US
TNMR
(dB)
224
224
224
224*
224*
768
768
768
1536*
1536*
6
6
9
6
6
128
128
128
128
128
128
128
128
256
256
6
6
6
6
6
224*
256
256
1536*
3552
3552
6
6
6
128
128
128
256
384
384
6
6
6
256
256
224
224
3552
3552
8128
8128
6
9
6
6
128
128
128
128
384
384
512
512
6
6
6
6
224
224
8128
7040
6
9
128
128
512
512
6
6
* This value varies slightly between different types of network elements. The minimum downstream rate may
be as low as 224 kbps and as high as 256 kbps. The maximum downstream rate may be as low as 1500 kbps,
and as high as 1536 kbps.
Note that in the above table, unless otherwise indicated, interleaving uses the ‗high‘ delay value for ADSL, and
16 ms for XDSL.
9-State ADSL ―Good Pair‖ v.2.2
Page 14
9-State ADSL Good Pair Qualification v.2.2
9-State ADSL LOOP PARAMETERS FOR CO and RT DSLAMS
Retail
Up to 6 Mbps – Consumer
Up to 6 Mbps – Consumer
(adsl2+)
Up to 3 Mbps - Consumer
Up to 1.5 Mbps - Consumer
Up to 768 kbps - Consumer
4 – 6 Mbps - Business
2 – 4 Mbps - Business
1.5 Mbps - Business
768 kbps - Business
384 kbps - Business
192 kbps – Business
Wholesale
6M x 512k
6M x 512k (ADSL2+)
3M x 384k
1.5M x 256k
256k x 128k (grandfathered)
Bus 4.0M x 640k
Bus 2.0M x 640k
Bus 1.5M x 512k
Bus 768k x 512k
Bus 384k x 384k
9-State ADSL ―Good Pair‖ v.2.2
Minimum
Downstrea
m Data
Rate
Minimum
Upstrea
m Data
Rate
(kbps)
(kbps)
3040
128
3040
128
1568
800
200
4000
2016
1504
768
384
200
128
128
128
640
640
512
512
384
192
Maximum
Upstream
Attenuatio
n (dB)
Maximu
m CRC
errors in
5
minutes
20
100
24
29
33
45
21
24
28
28
36
45
100
50
25
12
100
50
25
12
12
12
Minimum
Downstrea
m Data
Rate
(kbps)
Minimum
Upstrea
m Data
Rate
(kbps)
Maximum
Upstream
Attenuatio
n (dB)
Maximu
m CRC
errors in
5
minutes
3040
3040
1568
200
200
4000
1568
1504
768
384
128
128
128
128
128
640
640
512
512
384
20
24
29
33
45
21
24
28
28
36
100
100
50
25
12
50
25
25
12
12
Max
Loop
Lengt
h in
LQS
Maximum
dc loop
resistance
@70° F
in ohms
(Ω)
Maximum
Capacitiv
e Length
(kft)
26g
EWL
6.5
540
10.2
8.0
670
12.5
9.5
11.1
15.0
6.9
8.1
9.3
9.4
12.0
15.0
790
930
1250
580
680
780
780
1000
1250
14.8
17.3
18.0
10.8
12.7
14.5
14.7
18.0
18.0
Maximum
dc loop
resistance
@70° F in
ohms (Ω)
Maximum
Capacitiv
e Length
(kft)
540
670
790
930
1250
580
680
780
780
1000
10.2
12.5
14.8
17.3
18.0
10.8
12.7
14.5
14.7
18.0
Max
Loop
Lengt
h in
LQS
26g
EWL
6.5
8.0
9.5
11.1
15.0
6.9
8.1
9.3
9.4
12.0
Page 15
9-State ADSL Good Pair Qualification v.2.2
22-State ADSL LOOP PARAMETERS FOR IPDSLAMS (ADSL2+)
22 State
IPDSLAMCO
18 Meg
12 Meg
6 Meg
3 Meg
1.5 Meg
768 k
22 State
IPDSLAMRT
18 Meg
12 Meg
6 Meg
3 Meg
1.5 Meg
768 k
Minimum
Downstrea
m Data
Rate
(kbps)
Minimu
m
Upstrea
m Data
Rate
(kbps)
12032
6048
3040
1568
800
224
128
128
128
128
128
128
Minimum
Downstrea
m Data
Rate
(kbps)
12032
6048
3040
1568
800
224
9-State ADSL ―Good Pair‖ v.2.2
Maximum
Upstream
Attenuatio
n (dB)
Maximu
m Code
Violation
s (CV) in
5
minutes
TNM 6dB
Profile
14
19
27
32
36
45
100
100
100
50
25
12
> 6dB
> 6dB
> 6dB
> 6dB
> 6dB
> 6dB
Minimu
m
Upstrea
m Data
Rate
(kbps)
Maximum
Upstream
Attenuatio
n (dB)
Maximu
m Code
Violation
s (CV) in
5
minutes
TNM 6dB
Profile
128
128
128
128
128
128
12
17
26
32
35
44
100
100
100
50
25
12
> 6dB
> 6dB
> 6dB
> 6dB
> 6dB
> 6dB
TNM
9dB
Profile
TNM
12dB
Profile
Max
Loop
Lengt
h
26g
EWL
(Kft)
> 9dB
> 9dB
> 9dB
> 9dB
> 9dB
> 9dB
> 12dB
> 12dB
> 12dB
> 12dB
> 12dB
> 12dB
4.8
6.4
9.1
10.8
12.1
15
400
680
850
980
1080
1250
7.5
12.7
15.9
18.0
18.0
18.0
TNM
9dB
Profile
TNM
12dB
Profile
Max
Loop
Lengt
h
26g
EWL
(Kft)
Maximum
dc loop
resistanc
e @70° F
in ohms
(Ω)
Maximu
m
Capaciti
ve
Length
(kft)
> 9dB
> 9dB
> 9dB
> 9dB
> 9dB
> 9dB
> 12dB
> 12dB
> 12dB
> 12dB
> 12dB
> 12dB
4.1
5.7
8.5
10.5
11.8
14.7
340
630
810
940
1040
1250
6.4
11.7
15.2
17.7
18.0
18.0
Maximum
dc loop
resistanc
e @70° F
in ohms
(Ω)
Maximu
m
Capaciti
ve
Length
(kft)
Page 16