9
Operation
Operation
The test set has two basic modes of operation: Talk
mode and Monitor mode. Talk mode is used for off-
hook operations (such as dialing verification, automatic
number identification, and audio quality verification).
Monitor mode is for audio monitoring of the Tip and
Ring pair while on-hook. In Monitor mode, the test set
has a high input impedance, which allows monitoring
of the line without disrupting conversations or data, if
present.
W
Caution
When testing circuits that are close to a
battery source, clipping onto a line may case
loud pops in the receiver. Holding the
receiver tightly against your ear may cause
acoustic shock. The test set is designed to
rest comfortably on the shoulder with some
space between the receiver and the ear. It
should be used in this position when
working close to a battery source.
Shorting the Tip and Ring leads together
while connected to a data line will disrupt
data on the line.
Talk/Monitor Switch
See Figure 1.
The Talk/Monitor switch is a rocker switch located on
the side of the test set. The T position puts the test set
into Talk mode. The M position puts the test set into
Monitor mode.
Operating the Test Set in Monitor Mode
In Monitor mode, the test set is always on-hook. The
test set draws no direct current from the line and it
transmits no signals to the line. In this mode, the test
set has a high ac input impedance, which allows
listening for audio signals without disrupting
conversations or data signaling that may be present.
Either the handset receiver or the speaker can be used
to monitor a line.
In the Monitor mode, the test set is typically used for
one or more of the following procedures:
•
Verification that a line is idle when looking for a
line to borrow
•
Listening for noise on the line
•
Hunting for tracer tones
•
Testing for high frequency data on the line by
using the TEST key.
•
Testing for dc voltage on the line by using the TEST
key.
Operating the Test Set in Talk Mode
In Talk mode, the test set performs a brief test for high-
speed data and talk battery on the line. If high-speed
data is detected, the test set generates an audio alarm
and remain on-hooks. 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”.
Originating a Call
1
Set the Talk/Monitor switch to M.
2
Clip the test set to Tip and Ring of a subscriber
loop.
3
Monitor (listen to) the line to verify it is idle.
4
If not idle, disconnect the test set from the line.
5
If the line is idle, set the Talk/Monitor switch to T.
The test set automatically tests for high-speed data
and talk battery on the line.
6
If data is detected, the test set will not go off-hook
(will lockout) and will alarm, indicating the
presence of data. Try another line.
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