7
8
Operation
Wiring Examples for Data Cable
Operation
Wiring Examples for Data Cable
Debugging
LED status
Notes: The T568A wiring standard is the same as
T568B, except that T568A swaps the green and
orange pairs. Either standard will test the same
electrically, as long as the same standard is used
on both ends of the cable.
T568B Data Cable Properly Wired
TESTER
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
REMOTE
T568B Data Cable Cross Over Cable
TESTER
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
REMOTEREMOTE
T568B Data Cable With Split Pairs
T568B Data Cable With a Shorted and Open Pair
TESTER
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
REMOTE
TESTER
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Short
Open
TESTER
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
REMOTE
TEST
1-2
(coax)
3-6
4-5
7-8
S
X
LOW BATT
SHORT
MISWIRE
REVERSAL
SPLIT
Quick Test: The LEDs for all four pairs glow
indicating a properly wired cable.
Quick Test: The LEDs for all four pairs glow
and the "X" LED illuminates indicating a properly
wired cross over cable.
TEST
1-2
(coax)
3-6
4-5
7-8
S
X
LOW BATT
SHORT
MISWIRE
REVERSAL
SPLIT
All four pairs cross over (transmit to receive
and receive to transmit).
Quick Test: The SPLIT LED glows and the LEDs
for pairs 3-6 and 5-6 flash indicating the split is
between these two pairs.
TEST
1-2
(coax)
3-6
4-5
7-8
S
X
LOW BATT
SHORT
MISWIRE
REVERSAL
SPLIT
There is a split between the pairs on
pins 3-4 and 5-6. Continuity is correct,
but the split can cause a high level of
crosstalk between the pairs.
A LED that does not glow
indicates an open pair
A flashing LED indicates a pair
with a wiring fault
Continuous glow indicates
a correctly wired pair
Quick Test: The LED for pair 1-2 flashes and the
SHORT LED glows indicating the pair is shorted.
The LED for pair 7-8 does not glow indicating
the pair is open.
TEST
1-2
(coax)
3-6
4-5
7-8
S
X
LOW BATT
SHORT
MISWIRE
REVERSAL
SPLIT
The pair on pins 1 and 2 is shorted and the
pair on pins 7 and 8 is open.
T568B Data Cable With Reversed Pair and Miswire
Quick Test: The LEDs for pairs 1-2, 3-6 and 4-5
flash to indicate a wiring error. The MISWIRE
and REVERSAL LEDs glow to indicate the type
of errors.
TEST
1-2
(coax)
3-6
4-5
7-8
S
X
LOW BATT
SHORT
MISWIRE
REVERSAL
SPLIT
The pair on pins 1 and 2 is reversed and the
wires on pins 5 and 6 are crossed at one end
of the cable.
T568B Data Cable Properly Wired
T568B Data Cable Cross Over Cable
T568B Data Cable With Split Pairs
T568B Data Cable With a Shorted and Open Pair
Status
1st Short
Flash
1-2
3-6
4-5
7-8
S
1-2
3-6
4-5
7-8
None
No
No
No
No
No
None
None
None
None
None
Pair 1-2 is wired correctly
Pair 3-6 is wired correctly
Pair 4-5 is wired correctly
Pair 7-8 is wired correctly
No Shield
2nd Long
Flash
"X" (Crossover)
Indicator
Fault
Indicators
Status
1-2
3-6
4-5
7-8
S
3-6
1-2
7-8
4-5
None
Yes
Yes
Yes
Yes
No
None
None
None
None
None
Pair 1-2 crosses over to 3-6
Pair 3-6 crosses over to 1-2
Pair 4-5 crosses over to 7-8
Pair 7-8 crosses over to 4-5
No Shield
"X" (Crossover)
Indicator
Fault
Indicators
Status
1-2
3-6
4-5
7-8
S
1-2
3-6
4-5
None
None
No
No
No
No
No
SHORT
None
None
None
None
Pair 1-2 is shorted
Pair 3-6 is wired correctly
Pair 4-5 is wired correctly
Pair 7-8 is open
No Shield
"X" (Crossover)
Indicator
Fault
Indicators
Debugging Test
Debugging Test
Debugging Test
Debugging Test
Debugging Test
T568B Data Cable With Reversed Pair and Miswire
1st Short
Flash
2nd Long
Flash
Status
1-2
3-6
4-5
7-8
S
1-2
3-6, 4-5
4-5, 3-6
7-8
None
No
No
No
No
No
None
SPLIT
SPLIT
None
None
Pair 1-2 is wired correctly
Wires on pair 3-6 are spilt with wires on pair 4-5
Wires on pair 4-5 are spilt with wires on pair 3-6
Pair 7-8 is wired correctly
No Shield
"X" (Crossover)
Indicator
Fault
Indicators
1st Short
Flash
2nd Long
Flash
1st Short
Flash
2nd Long
Flash
Status
1-2
3-6
4-5
7-8
S
1-2
3-6, 4-5
4-5, 3-6
7-8
None
No
No
No
No
No
REVERSAL
MISWIRE
MISWIRE
None
None
Pair 1-2 is reversed at one end of the cable
There is a misconnection between pairs 3-6 and 4-5
There is a misconnection between pairs 4-5 and 3-6
Pair 7-8 is wired correctly
No Shield
"X" (Crossover)
Indicator
Fault
Indicators
1st Short
Flash
2nd Long
Flash
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