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Cabling ESD Study IEEE 802.3 Cable Discharge Ad-Hoc Page 1 of
7March 2001
Cabling ESD StudyLucent Technologies
1. Subject di fferent cables to a Human Body Modelcontact
discharge of 8 KV.
2. Release charge after 4 hours and capture response(Record
temperature and humidity).
3. Normalize responses to a single humidity usinglinear
correlation.
4. Compare responses for di fferent cable types.
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Cabling ESD Study IEEE 802.3 Cable Discharge Ad-Hoc Page 2 of
7March 2001
On ground plane looking
toward the ESD
charging-end fixture
56 meter length of 4-pr
UTP cable arranged in
serpentine pattern
10 cm spacing between
adjacent loops and edges
of 1.2m x 5.2m ground
plane
Cable Layou tCable Layou t
Cable layout onground plane
looking toward
current sensing
transducer
Transducer
connected to scope
through 20 dB
attenuator and 1m
length of coax
Discharging PointDischarging Point
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Cabling ESD Study IEEE 802.3 Cable Discharge Ad-Hoc Page 3 of
7March 2001
Discharge tip
positioned on BNC
adapter shield
Orange conductor
pair connected to
binding post shield
connection
Unused pairs
connected to ground
plane through
binding post BNC
adapter
ESD chargingESD charging--end fixtureend fix ture
Discharge end of cable showing the connection to the
current-
sensing transducer via a relay contact.
Unused pairs are shown connected to the ground plane through
a
copper foil.
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Cabling ESD Study IEEE 802.3 Cable Discharge Ad-Hoc Page 4 of
7March 2001
Discharge waveforms for cables under test with unused
pairs connected together and grounded (First Cycle)
CURRENT INTO TARGET (AMPS)CURRENT INTO TARGET (AMPS)
Discharge waveforms for t=4 hours time interval at relative
humidities of50%
and 63% for case of unused pairs connected together and
grounded.
0
1
2
3
4
5
6
7
8
9
10
0 50 100 150 200 250 300 350 400 450 500
Time (nanoseconds)
Current into Pellegrini Target (Amps)CURRENT INTO TARGET
(AMPS)CURRENT INTO TARGET (AMPS)
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Discharge waveforms for t=4 hours time interval for case of
unused pairs connected
together and grounded
Discharge waveforms for t=4 hours for case of unused pairs
floating
0
1
2
3
4
5
6
7
8
9
10
0 50 100 150 200 250 300 350 400 450 500
Time (nanoseconds)
Cat 5 54% RH Cat 6 45% RH Cat 6 43.5% RH
Cat 6 50% RH Cat 6 53% RH Cat 6 46% RH
Cat 5E 58% RH
0
1
2
3
4
5
6
7
8
9
10
0 50 100 150 200 250 300 350 400 450 500
Time (nanoseconds)
Cat 5 52% RH Cat 6 45% RH Cat 6 41.5% RH
Cat 6 46% RH Cat 6 55% RH Cat 6 47% RH
Cat 5E 57% RH
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Discharge waveforms for t=4 hours time interval (with unused
pairs grounded) after
correction for humidity.
Discharge waveforms for t=4 hours time interval (with unused
pairs floating) after
correction for humidity.
0
1
2
3
4
5
6
7
8
9
10
0 50 100 150 200 250 300 350 400 450 500
Time (nanoseconds)
Cat 5 Cat 6 Cat 6
Cat 6 Cat 6 Cat 6
Cat 5E
0
1
2
3
4
5
6
7
8
9
10
0 50 100 150 200 250 300 350 400 450 500
Time (nanoseconds)
Cat 5 Cat 6 Cat 6
Cat 6 Cat 6 Cat 6
Cat 5E
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Cabling ESD Study IEEE 802.3 Cable Discharge Ad-Hoc Page 7 of
7March 2001
CONCLUSION:
No significant difference in discharge betweendifferent cable
categories.
Equipment should at least meet (human body)Standard IEC
61000-4-2 Guideline:
According to Section A.4 Table A.1:
Class 1 equipment (2 kv test level) should:
-not be in a low humidity environment
- be protected by Anti-static Material
Class 2 equipment (4 kv test level) should :
- be protected by Anti-static Material
Class 3 equipment (8 kv test level) should :
-not be in a low humidity environment
Class 4 equipment (15 kv test level) should :
- Not to worry (too much)
