10
TS25D Test Set
Users Guide
DTMF Detection
The TS25D Test Set allows the user to capture DTMF
tones generated on a telephone line by telephones, fax
machines, modems or any other DTMF generating
device. This feature is useful when you suspect the
customer’s telephone equipment is not generating
proper DTMF signals.
To detect DTMF tones:
1
Connect the test set to Tip and Ring of the line
under test.
2
Switch the test set to Monitor (
M
) mode.
3
Put the customer’s telephone in Tone Dialing
mode and take it off-hook.
4
Dial a number on the customer’s phone. The
number dialed will be detected and displayed on
the test set’s LCD.
5
Verify that the number on the LCD is the same as
the number you dialed.
The TS25D Test Set will detect and display the
DTMF tones for 0-9,
∗
, #, A-D.
To clear the LCD screen, switch the test set off, and then
back to Monitor mode. DTMF detection is only
available when the TS25D Test Set is in Monitor mode.
Call and Dialing Functions
Note
Remove the protective film that covers the LCD
display before using your test set.
Originating a Call
To originate a call:
1
Clip the test set to Tip and Ring of a powered
subscriber loop.
2
Switch the test set to Monitor (
M)
mode and listen
to the line to verify it is idle.
3
If not idle, disconnect the test set from the line.
4
If the line appears to be idle, set the slide switch to
the Talk (
T
) position.
5
If no data is detected, the test set will go off hook.
6
If high-speed data is detected, the test set will not
go off hook (will lockout) and will display
DATA
DETECTED, DOWN ARROW TO OVERRIDE
,
indicating the presence of data. Try another line or
you can override the data lockout (see Data
Lockout Override).
7
The numeric keypad,
LNR
key, or memory dialing
may be used to dial a number for originating a
call.
To disconnect a call, switch the test set off, or to
monitor, or remove the clip leads from the line.
