12
TS52PRO Test Set
Users Guide
Ground Start
Ground start lines are typically found on PBX
installations. To activate an idle ground start telephone
line, do the following:
1
Set the Talk/Monitor switch to
M
, 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, set the
Talk/Monitor switch to
T
. When dial tone is
received, remove the third wire from earth. The
circuit is now ready for dialing.
Data Lockout Operation
With the increase in high capacity data lines in the
distribution system comes the greater risk of disrupting
data services when working on analog lines. The test
set is designed to be used by Outside Plant and Central
Office technicians to perform their normal duties while
greatly reducing the possibility of accidentally
disrupting data service.
Accidentally going off-hook on a data line while
searching for talk battery or dial tone on an unmarked
terminal block or cable splice could bring down a high-
capacity data line. To prevent this, the test set provides
an automatic data lockout function. When the test set,
with its Talk/Monitor switch in the
T
position, is
connected to a Tip and Ring pair, it automatically tests
the line for high-speed data (data signals that are
above the human audio range) before going off-hook.
If data is detected, the test set locks out, preventing
itself from going off-hook, a warning beep sounds, and
LOCKOUT
is shown on the display.
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 prevent
disruption of data. The test set can detect and protect
high frequency data services.
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 move the Talk/Monitor switch to
T
. If you do
switch to
T
, 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
Switch the Talk/Monitor switch to
T
.
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
LOCKOUT
is shown on the
display. If there is no data on the line, the test set
goes off-hook.
2
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.
