Communication Markets Division © 3M 2007. All Rights Reserved. 965AMS Autotest Training.
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Transcript of Communication Markets Division © 3M 2007. All Rights Reserved. 965AMS Autotest Training.
2© 3M 2007. All Rights Reserved.
Communication Markets Division
Basic Testing
Press Autotest Select No Fed. Press Setup
When changes are made press OK
3© 3M 2007. All Rights Reserved.
Communication Markets DivisionAutotest Without FED
The Autotest identifies copper problems.
Vdc – Test for CO battery.
Vac – Test for Induced AC.
Ohms – Test for insulation problems resulting in shorts and/or grounds.
Opens – Measures capacitive length.
%Cap – Displays the difference in T-R and T-G Opens as a percentage.
Load – Counts load coils and provides distance to first.
LBal – Measures longitudinal Balance to test the electrical similarity between T to G and R to G.
4© 3M 2007. All Rights Reserved.
Communication Markets DivisionVacant POTS With FED
Loss – Measures loss at 1004 Hz.
Noise – Measures audible noise that would be heard on active pair.
PI (Power Influence) – Measure induced noise from power lines.
Slope – Measures difference between 1004 Hz and 2804 Hz.
RBal – Measures resistive difference between T-G and R-G. Indicates high resistance opens.
VB Slope – Identifies loading problems.
The FED allows additional tests that will identify potential voice problems.
5© 3M 2007. All Rights Reserved.
Communication Markets Division
Faults
Faults: Fault Locate Method:Complete Open Open Meter or TDRPartial Open TDR or Opens by RatioSplit TDRGround RFLShort R<1K use TDR else use RFLCross RFLBattery Cross RFLDirty Open RFL or TDR
6© 3M 2007. All Rights Reserved.
Communication Markets Division
Capacitance Faults
Complete OPEN:A fault where a conductor is cut off completely.
Partial OPEN:A fault where a high resistance path developed on a conductor. ( Ex. Corroding splice)
2305 ft
3400 ft
1573 ft
38
3340 ft
3300 ft
3400 ft
48
%46 %3
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Communication Markets Division
Capacitance Faults Cont..SPLIT: A splicing error where one conductor of a pair (normally ‘Tip [A]’ because they the same color) is spliced to ‘Tip
[A]’ of another pair.
3350 ft
3400 ft
3300 ft
46
%3
8© 3M 2007. All Rights Reserved.
Communication Markets Division
Resistance FaultsGROUND : A fault between ‘Tip [A]’ and ‘Ground’, ‘Ring [B]’ and ‘Ground’ or both conductors and ‘Ground’.
4 dB
200 Ω>999 MΩ
9© 3M 2007. All Rights Reserved.
Communication Markets Division
Resistance Faults Cont..
SHORT : A fault between ‘Tip [A]’ and ‘Ring [B]’ conductors.
71 dB
>420 Ω >999 MΩ
>999 MΩ
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Communication Markets Division
Resistance Faults Cont..CROSS : A fault between a non-working (pair under test) and another or other non-working pairs .
4200 ft
3600 ft
3900 ft
30 dB
8.4 %
% Cap and LBal will be pass/fail results that will be affected.
11© 3M 2007. All Rights Reserved.
Communication Markets Division
Resistance Faults Cont..Battery CROSS : A fault between a working pair and a non-working pair (pair under test).
Pair # 1 - Working pair
Pair # 2 - Non-working(Pair under test)
-48 VDC
-46 VDC
Solid Cross Fault
Water
-48 VDC
-7 VDC
Resistive Cross fault
Pair # 1 - Working pair
0.0 V 0.0 V -46.0 V
30 dB
Ohms and LBal will be pass/fail results that will be affected.
12© 3M 2007. All Rights Reserved.
Communication Markets Division
Dirty Opens3. Dirty OPEN: Any combination of a ‘RESISTANCE’ and ‘CAPACITANCE’ faults
A: Complete OPEN and a SHORT B: Complete OPEN and a GROUND C: Complete OPEN and a CROSS
D: Partial OPEN and a SHORT E: Partial OPEN and a GROUND
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Communication Markets Division
Open Shields
For shields that are breaking down the 965AMS can be used to determine distance to the break.
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Communication Markets Division
Connecting the FED II
Connect the FED to pair being tested. Go to other end of pair and connect the 965AMS.
TipCable
s
CableVault
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Communication Markets Division
Wideband Setup
1. Press the Autotest key
2. Scroll up/down to Wideband
3. Press Setup
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Communication Markets Division
Wideband Setup – Cont.
Set the Wideband parameters.
Aircore
Jelly-Filled
2 Pair Drop
5 Pair Drop
Calibrated
19
22
24
25
26
28
Custom 1
Custom 2
56 KB
64 KB
ISDN
HDSL
T1
E1
ADSL
ADSL2
HDSL2
HDSL4
H2/4ACC
H4RACC
H4NACC
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Communication Markets Division
Wideband Test
When the parameters have been set then press Test Pair 1.
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Communication Markets Division
Wideband Results
Press F1 to Navigate between Values and Pass/Fail
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Communication Markets Division
Wideband Autotest
VDC: Voltage DC which can indicate working dial tone or a cross to worker in DC is present.
VAC: Voltage AC which indicates powerline induction when present
Ohms: Insulation test. A low number indicates poor insulation at the fault(s)
Opens: The length of the conductors.
%Cap: Percent of Capacitance is the difference between the T-G and R-G length.
Noise: The level of noise that is measured with some type of filter. ADSL2+ uses the G2 filter. VDSL2 uses an H (H1, H2, H3 or H4) filter.
Load: Amount of load coils measured in the circuit. Can be false if DSLAM or customer equipment is connected during test.
LBal: Longitudinal Balance of the circuit. Tests for circuit balance with respect to ground.
Loss: The measured loss of some frequency in the range of the tested circuit.
RBal: Resistive balance to compare Tip to ground and ring to ground resistance to loop.