A) Polarity and Line Voltage Test (DC)
press the Polarity button. If no indication is shown by the Red or Green
Polarity LED's and the Voltage display LED's, you may not have the correct
Line selected. Gently slide the Line Select Switch to the other position
and repeat this step. If you still have no indication, then neither line
is working. There may be a loose connection, broken wire, or short in the
|Green Indicator||Properly wired network.|
|Red Indicator||Incorrectly installed network needing retermination and inspection. Often this will not harm your equipment but it may prevent proper function of some modems, facsimile machines, and tone-dialing telephones.|
|Yellow Indicator||Do not risk using this network! Serious equipment damage may result! Over 57 VDC.|
|Green Indicator||A properly balanced network. Between 42 and 56.5 VDC|
|Red Indicator||A poor or damaged Network needing repair and inspection. Check for well terminated connections. Perform Loop Test to determine if suficient Loop Current is available.|
If a Polarity indication was given, lightly press the button shown for
Loop Test. This will simulate an "off-hook" telephone. The Red LED will
light brightly if sufficient power is available to operate a telephone
or other device. If the LED does not shine or is very dim, either another
device is in use or the line has a partial fault. No Telephone Network
Device can properly operate with no or insufficient Loop Current.
|Bright Indicator||Sufficient Loop Current is available for operation of one or more devices.|
|Dim Indicator||Sufficient Loop Current is available for operation of one device and/or other devices are in use.|
|No Indication||Marginal or No Loop Current. Equipment may possibly operate, but at reduced quality and performance.|
With no buttons pressed, the BT-10 is in a stand-by mode waiting for
a Ring signal. Upon reception of a Ring signal this display will
strobe and measure the signal's peak RMS voltage. Use the chart on
the BT-10 as a convenient reference.
|Yellow Indicator||Strong ring signal. Over 110Vrms.|
|Green Indicator||Normal ring signal. Over 80 Vrms.|
|Red Indicator||Low ring signal. Over 40 Vrms. If this indicator does not react, most equipment will not detect a ring.|
After verifying proper Network operation, remove the adapter and replace
with a line cord. Repeat Step III A & B. A good line cord
should not change the results of your previous testing.
Common installation wire colors: Line 1 Tip-Green, Ring-Red. Line 2 Tip-Black, Ring-Yellow.
All line cords are not created equal: Inexpensive line cords often do not maintain proper polarity.
Local providers often are not aware of network problems: It
is your responsibility to inform your provider.
|Caution Do Not Exceed 150 VRMS to the Test Jack. The BT-10 should not be permanently connected to a telephone network. Use it only to test the network and then disconnect from the telephone wiring.|
The Telephone Technician's pocket wizard.
Modem protection, the perfect laptop companion!
BT-10 Technical Information.
Frequently Asked Questions (FAQ).
View .PDF Brochure.