VDV MultiMedia Cable Tester has the ability to turn off the split pair error testing. Pressing
the button for the current cable test mode for more than 2 seconds turns off the split pair
testing. The “Split” icon and the word “OFF” appears on the screen momentarily to indicate
this. The split pair testing will resume the next time the tester is turned on, or may be toggled
back on by another 2 second press of the current test mode button.
BATTERY REPLACEMENT
When the battery low icon is on, the battery should be replaced as soon as practical.
The cable testing results will become unreliable when the battery reaches about 4.5 volts.
To replace battery:
1. Remove the screw from the battery door on the back of the unit with a
#1 Phillips-head screwdriver.
2. Pull battery out of cavity and remove battery snap.
3. Connect a new Alkaline 9 volt battery to battery snaps. Place battery back into body
with battery snaps placed toward front end of compartment.
4. Replace battery door and screw being careful to not over tighten the screw.
SPECIFICATIONS
Physical Dimensions
Size: 13.2
×
7.3
×
4.1 cm (5.2
×
2.9
×
1.6 inches)
Weight: 242 grams (8.5 oz.) with battery and remote
Environmental
Operating temperature: 0 to 50 °C (32 to 122 °F)
Storage temperature: -10 to 60 °C (14 to 140 °F)
Humidity: 10% to 90%, non-condensing
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2. Turn on VDV MultiMedia Cable Tester by pressing the button associated with the
connector to be used followed by pressing the TONE button. Short presses of the
TONE button will select a different pin. Holding down the TONE button for more than
2 seconds will select a different tone pattern.
3. To turn VDV MultiMedia Cable Tester off, press any button except TONE. The tone
will turn off automatically after about 2.4 hours.
INTERPRETING CABLE TEST RESULTS
The Pass icon will be on if the cable has all pins properly connected per T568A/B for
network cables or per 3-pair USOC for telephone cables. The Fail, Short, Open or Split
icon will be on if there is a wiring error. The wire map will display the end-to-end
connections measured whenever possible.
The Pass icon will also be on with a flashing Uplink icon if a network cable has the
1-2 and the 3-6 pairs transposed to indicate a properly wired uplink (crossover) cable.
In Voice mode, the Rev icon will flash if all connected pins are in reverse order and the
Pass icon will also be on if all 6 connections are present. Telephone modular plug cables
used between the wall jack and a phone set are usually reverse pinned.
Definition of Errors
– The three classes of faults discussed below are in order of severity.
The severity has to do with the ability of a more severe error to mask less severe errors.
For example, if there is a short in the cable, miswires and split pairs may not be detected
for the pairs involved in the short fault.
Short
– The pair has a low resistance connection from one wire of the pair to the other wire
of the pair or to any other wire in the cable or the shield. A short is indicated by the Short
icon being on and flashing -’s in the appropriate pin positions on the second line for the
pin numbers involved in the shorts plus a flashing S icon if the shield is shorted to a pin.
Miswire
– A wire or both wires of a pair are not connected to the correct pins at the
other end of the cable. The wire map shows the pin numbers line 1 (main) line 2 (remote).
A reverse pair is a special case of a miswire in which the pair is wired to the correct pair
of pins or to another designated pair of pins, but the two leads are reversed. The VDV
MultiMedia Cable Tester is able to test for split pair errors as long as the wiring errors
are in pairs. The Fail icon and the pin numbers, which are miswired, will be flashing.
Split Pair
– A split pair is an error in the twisting of the wires together within the cable.
The cables generally are made up of eight wires twisted together in 4 pairs. These 4 pairs
are designated as pairs by the wiring standards and are intended to carry a signal and its
return. 1 & 2, 3 & 6, 4 & 5 and 7& 8 are the pairs designated by T568A/B for a RJ45 jack or
plug. A cable can be wired with correct continuity but not with correct pairing. This most
often happens when the cable is terminated consistently at both ends, but in the wrong
order. A dynamic or AC test is required to detect this type of error. If the only error is a
split pair error, the cable has correct continuity. If cross talk is not a concern, as in flat
satin cable, the cable is good if the only error is the split pair error. The Split icon and the
pin numbers on the first and second line of the wire map with split pairs flash when there
is a split pair error.
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