Overview of PN4254 (Draft) North American Network Access

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Overview of PN4254 (Draft) North American Network Access
Changes to Skeleton document that forms the
basis of PD TM6(02)07, Access Transmission
Network Model for Evaluating xDSL Modem
Performance,
Jack Douglass, Paradyne International
Chair TIA TR30.3
Nov 4 to 8, 2002, ETSI TM6 TD43
024t43 Presentation
[email protected]
Example General European
Access Network Model
• Added “Fat Cable” 3000(?) Pair Binder, 0.32 mm, 30 m, no binders) is
used from MDF to the Exchange Manhole
• Added Remotely Located DSLAM
CPE Wiring
Telephone
Exchange
Exchange
0.5 mm
150 m
Street
Cabinet
MDF
DSLAM
Distribution Cable
25(?) -pair binder
0.4, 0.5, 0.63 mm
2 to 7 km
3000(?)-pair binder
0.32 mm
30m
Remotely
Located
DSLAM
CPE Wiring
Drop Wire
0.5 mm PE
50 m
Local
Distribution
Point
Branch Cable
25-pair binder
0.5 mm PE
0.25, 0.5, 0.63, 1.0
km
CPE Wiring
Exchange
Noise
Injection
Intermediate
Noise
Injection
CPE Wiring
CPE
Noise
Injection
Example Test Loop Make-up
Table 4 — Example Test Loop Make-up and LOOs
Loop
Loop
No.
Exchange
Wiring
(0.5 mm)
Length
(m)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Distribution Cable
“Fat
Cable”
Length
(0.32
mm)
Length
(0.4
mm)
Length
(0.5
mm)
Branch Cable
Length
(0.63
mm)
Length
(0.5
mm)
Total
Loop
Length
(km)
Length
(0.63
mm)
DC
Resist
ance
(ohms)
Loop
Loss
@ 100
kHz
(dB).
Loop
Loss
@ 300
kHz
(dB)
Drop Wire
Gauge
(mm)
PE
2.00
2.25
2.50
2.75
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
5.75
6.00
6.25
6.50
6.75
7.00
Length
(m) PE
LOO
%
Example General Loop Diagram
MDF Wiring
0.5 mm
100 m
DSLAM
Distribution Cable
25(?)-pair binder
0.4, 0.5, 0.6 mm
2 to 7 km
2000?-pair binder
0.32 mm
30 m
Branch Cable
25-pair binder
0.5 mm PE
0.25, 0.5, 1.0 km
Drop Wire
0.5 mm PE
50 m
CPE
Crosstalk Impairment Combinations (IC)
Loop XX (LOO/Length) – Residential
Table 5 — Crosstalk Impairment Combinations for Loop XX (LOO/Length) – Residential/Multiunit
Impairment Severity
Impairment LOO
NEXT
A
5%
B
C
15%
30%
Number of Interferers
Exchange Injection Point
D
50%
Exchange Wiring (100 m)
Self-NEXT
MDF
ISDN BA 2B1Q
ISDN BA 4B3T
2 Mbit/s HDB3 (2-pair)
HDSL 2B1Q 392 ks/s (3-pair)
HDSL 2B1Q 584 ks/s (2-pair)
HDSL 2B1Q 1160 ks/s (1-pair)
HDSL CAP 2320 kbit/s (1-pair)
ADSL over POTS FDD
ADSL over POTS EC
ADSL over ISDN FDD
ADSL over ISDN EC
ADSL lite
SDSL 784 kbit/s
SDSL 1505 kbit/s
SDSL 2056 kbit/s
Intermediate Injection Point
ISDN BA 2B1Q
ISDN BA 4B3T
2 Mbit/s HDB3 (2-pair)
HDSL 2B1Q 392 ks/s (3-pair)
HDSL 2B1Q 584 ks/s (2-pair)
HDSL 2B1Q 1160 ks/s (1-pair)
HDSL CAP 2320 kbit/s (1-pair)
ADSL over POTS FDD
ADSL over POTS EC
ADSL over ISDN FDD
ADSL over ISDN EC
ADSL lite
SDSL 784 kbit/s
SDSL 1505 kbit/s
SDSL 2056 kbit/s
CPE Injection Point
ISDN BA 2B1Q
ISDN BA 4B3T
2 Mbit/s HDB3 (2-pair)
HDSL 2B1Q 392 ks/s (3-pair)
HDSL 2B1Q 584 ks/s (2-pair)
HDSL 2B1Q 1160 ks/s (1-pair)
HDSL CAP 2320 kbit/s (1-pair)
ADSL over POTS FDD
ADSL over POTS EC
ADSL over ISDN FDD
ADSL over ISDN EC
ADSL lite
SDSL 784 kbit/s
SDSL 1505 kbit/s
SDSL 2056 kbit/s
Some of these systems should be excluded because they are rarely found in residential areas.
Crosstalk Impairment Combinations (IC)
Loop XX (LOO/Length) – Business
Table 6 — Crosstalk Impairment Combinations for Loop XX (LOO/Length) – Business
Impairment Severity
Impairment LOO
NEXT
A
5%
B
C
15%
30%
Number of Interferers
Exchange Injection Point
Exchange Wiring (100 m)
Self-NEXT
MDF
ISDN BA 2B1Q
ISDN BA 4B3T
2 Mbit/s HDB3 (2-pair)
HDSL 2B1Q 392 ks/s (3-pair)
HDSL 2B1Q 584 ks/s (2-pair)
HDSL 2B1Q 1160 ks/s (1-pair)
HDSL CAP 2320 kbit/s (1-pair)
ADSL over POTS FDD
ADSL over POTS EC
ADSL over ISDN FDD
ADSL over ISDN EC
ADSL lite
SDSL 784 kbit/s
SDSL 1505 kbit/s
SDSL 2056 kbit/s
Intermediate Injection Point
ISDN BA 2B1Q
ISDN BA 4B3T
2 Mbit/s HDB3 (2-pair)
HDSL 2B1Q 392 ks/s (3-pair)
HDSL 2B1Q 584 ks/s (2-pair)
HDSL 2B1Q 1160 ks/s (1-pair)
HDSL CAP 2320 kbit/s (1-pair)
ADSL over POTS FDD
ADSL over POTS EC
ADSL over ISDN FDD
ADSL over ISDN EC
ADSL lite
SDSL 784 kbit/s
SDSL 1505 kbit/s
SDSL 2056 kbit/s
CPE Injection Point
ISDN BA 2B1Q
ISDN BA 4B3T
2 Mbit/s HDB3 (2-pair)
HDSL 2B1Q 392 ks/s (3-pair)
HDSL 2B1Q 584 ks/s (2-pair)
HDSL 2B1Q 1160 ks/s (1-pair)
HDSL CAP 2320 kbit/s (1-pair)
ADSL over POTS FDD
ADSL over POTS EC
ADSL over ISDN FDD
ADSL over ISDN EC
ADSL lite
SDSL 784 kbit/s
SDSL 1505 kbit/s
SDSL 2056 kbit/s
D
50%
Model Assumptions
•
•
•
•
•
In a hardware simulator, NEXT is inserted at both ends
so that tests can be run in both directions simultaneously
In a hardware simulator, insertion of NEXT at one end of
the loop produces an approximation of FEXT at the
other end
FEXT should be included at both ends??
NEXT model is the T1.417 issue 1, simplified NEXT
model (sect A.2.2.1.1).
FEXT model is the T1.417 issue 1, FEXT model (sect
A.2.2.2).
Proposed Procedure
•
•
Create straw-man Network Model(s) using sample template and
experience
Gather published and anonymous statistical information on European
Access Network where ever possible
– Loop (configuration, binder size, type of cable, gauge, etc.)
– Crosstalk data (numbers and types of interferers currently installed and
marketing deployment information)
– Steady-State Impairments (e.g., Ingress impairments, AM Radio, etc.)
– Transient Impairments
•
•
•
Revise straw-man Network Model(s) based on statistical information
Validate model using real xDSL equipment of different technologies
Compare validation results with known real world performance
Next Steps
• Send a Formal Liaison to FSAN to request
network statistics
• Consider opening a new Work Item (WI) or
continue as a Permanent Document

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