12
TS54TDR PRO Test Set
Users Guide
When the test set is locked out, it remains on-hook, it
does not draw direct current from the line, and it
presents a high ac impedance to the line to reduce the
possibility of disruptions to data. The test set can detect
and protect high frequency data services.
Ground Start
Ground start lines are typically found on PBX
installations. To activate an idle, ground-start
telephone line, do the following:
1
Press Q, and connect the test leads to Tip and
Ring of the ground start line. With a third wire,
temporarily short the Tip side of the line to earth
ground. A wire with an alligator clip at each end is
often used for this. Do not allow clips to short
network connections.
2
With the short to earth ground in place, press
P. When dial tone is received, remove the third
wire from earth. The circuit is now ready for
dialing.
Data Safe Practices
Always monitor the line for an audible signal before
attempting to go off-hook to draw dial tone. The data
detect circuitry on the test set is designed to detect
data signals above the human audio range. To detect
data signals within the human audio range, such as
produced by voiceband modems and subrate DDS
transceivers, you must listen to the line using the test
set’s audio monitoring capability. If you hear the hiss of
a voice band modem or low frequency data transceiver,
do not press
P. If you press P, the test set will not
lock out because it does not detect low frequency data.
It will go off-hook and will interfere with the voice
band modem or data transceiver. To avoid this, try
another line or wait until the line is idle.
Data detection is a two part process. The first part
requires listening to the line for audible data traffic in
Monitor mode as described above. If the line is quiet,
then the second part is to use the test set’s data detect
capability to determine if there is data above the
human audio range on the line. This can be done as
follows:
1
Press P.
The test set automatically performs a brief test for
high-speed data. If there is data on the line, the
test set locks out, (remains on-hook), a warning
beep sounds, and
Data Detect Lockout is
shown on the display. If there is no data on the
line, the test set goes off-hook.
2
If there is no data on the line, you can now dial a
number.
When going from pair to pair searching for tracer tone
or dial tone, it is best to connect the test set to Tip and
Ring of the pairs. Avoid the practice, either in Talk or
Monitor mode, of clipping one lead of the test set to
ground, and using the other lead to search for tracer
tone or dial tone on a block. This may create an
electrical imbalance on a data line that will disrupt
service. Once you find the voice line you are searching
for then it is OK to test Tip to ground or Ring to ground
on that line.
Be careful not to short the test leads together when
connecting to a data line (or any line for that matter),
as this could bring down the service.
Put the test set in Monitor mode when you use other
instruments to troubleshoot a line.
Data Lockout Override
Normally, when the test set detects data, it means the
operator has accidentally connected to a high-speed
data line and should immediately disconnect from the
line to avoid disrupting the data service.
But in some cases the operator must go off-hook on a
specific line even though the test set indicates that the
line is a data line.
The following are scenarios where the operator may
wish to override a data lockout:
•
When there is false data detection due to RF
pickup on a line that is near an AM radio
broadcast antenna. The RF induced in the line may
appear to be data.
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