11
How to Use the Monitor and Talk Modes
Talk Mode
To select Talk mode, press P. The test set performs a
brief test for high-speed data and it looks for talk
battery on the line. If high-speed data is detected, the
test set generates an audio alarm and remains on-
hook. If high-speed data is not detected and talk
battery is present, the test set goes off-hook. When off-
hook, the test set operates like a standard telephone
and is typically used to verify the proper operation of a
voice telephone line or to establish temporary
communications on a “borrowed pair”.
Low Voltage Lockout
If you press
P, and the test set sees 4 V or less, it
shows
Low Voltage Lock Out, and will not go
off-hook.
Originating a Call
1
Press Q.
2
Connect the test leads to the Tip and Ring of a
subscriber loop.
3
Monitor (listen to) the line to verify that it is idle.
4
If the line is not idle, disconnect the test set from
the line.
5
If the line is idle, press P. The test set
automatically tests for high-speed data.
6
If data is detected, the test set will not go off-hook
and Data Detect Lockout shows on the
display. Try another line.
7
If there is no data on the line and talk battery is
present, the test set goes off-hook and draws dial
tone.
Note
The test set will not go off-hook if the line
voltage exceeds 140 V dc.
8
Dial the desired number.
Note
If you mis-dial the number, press
Q, press
P, then enter the number again.
Disconnecting a Call
To disconnect a call, press
Q or remove the test
leads from the line.
Answering a Call
1
If a ringing signal is received, press P. 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.
Note
The test set will not go off-hook if the line
voltage exceeds 140 V dc. See "High Voltage
Lockout Operation" on page 13.
3
If the test set detects data, it not go off-hook and
it shows Data Detect Lockout on the
display. See the sections, "Data Lockout Override"
on page 12 and "Data Safe Practices" on page 12.
4
To go off-hook with data present, press $. See
"Data Lockout Override" on page 12.
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 you put the
test set in Talk mode then connect it 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 the test set detects data, it
locks out and does not go off-hook. A warning beep
sounds, and
Data Detect Lockout shows on
the display.
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