Disconnecting A Call; Answering A Call; Ground Start; Data Lockout Operation - Fluke TS44DLX User Manual

TS44DLX Deluxe Test Set
Users Guide
7 If there is no data and talk battery is present, the
test set goes off-hook and draws dial tone.
The test set will not go off-hook if the line
voltage exceeds 140 Vdc.
8 Dial the desired number.

Disconnecting a Call

To disconnect a call, set the Talk/Monitor switch to M or
remove the test leads from the line.

Answering a Call

1 If a ringing signal is received, set the Talk/Monitor
switch to T. The test set automatically tests for
high-speed data on the line.
2 If there is no data and talk battery is present, the
test set goes off-hook and draws dial tone.
The TS44DLX Deluxe will not go off-hook if the
line voltage exceeds 140 Vdc.
3 If data is detected, the test set will lockout and
alarm, indicating data is present.
4 To go off-hook with data present, press the
Override key sequence (see "Data Lockout
Override Operation" on page 11).

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.
10
Note
Note

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 lines. 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, and it provides a continuous
audio alarm indicating it has detected data.
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
the following data services: ISDN BRI, ISDN PRI, 56k
DDS, SW56, T1 and E1, HDSL, IDSL, SDSL, ADSL DMT,
ADSL CAP, and ADSL LITE.

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 lockout 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.