TS 25D Test Sets | TS25D telephone tester - Fluke Networks

TS® 25D Test Sets

The TS25D telephone tester features data lockout and lockout override, and a large LCD.

  • Caller-ID and Call Waiting Caller-ID
  • Amplified speakers for hands-free monitoring
  • Data lockout and data lockout override
  • Tone generator for wire identification
  • Talk battery to power voice conversation on dry (non-powered) lines
  • Easy to read oversized liquid crystal display
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TELCO Tools Selection Guide


This feature-rich test set is a necessity for a variety of installs. The TS25D Test Set features data lockout and lockout override, making you completely safe in talk or monitor mode. The DSL/POTS filtering technology allows you to safely draw dial tone without downing DSL.

A built-in analog tone generator simplifies wire identification with a probe. An amplified speaker makes monitoring the line hands-free, so you can keep working. The talk battery function provides voltage to carry voice conversation on non-powered pairs.

All in a compact unit with an oversized robust liquid crystal display (LCD) that makes the intuitive, common-sense menus easy-to-read and use.

TS® Professional Series – Products Comparison



Features data lockout, lockout override and a large LCD

The TS®25D Test Set top features include:

  • Caller ID and call-waiting caller-ID (on N. American phone systems)
  • Data lockout and data lockout override
  • DSL/POTS filtering technology lets you safely draw dial tone from a pair that is carrying voice and ADSL without downing the ADSL service
  • Built-in analog tone generator for tracing and identifying wires with a probe
  • DTMF digit grabbing capability
  • Talk battery to supply power to non-powered (dry) pairs to carry voice conversation
  • Row/column tones for single tone dialing
  • High voltage Lockout/Low voltage Lockout
  • Continual data detection in monitor mode
  • Over voltage and over current protection
  • Amplified speaker for hands-free monitoring
  • Programmable phonebook stored in non-volatile memory
  • Speed dial (10 memories, 23 digits each)
  • Selectable flash and pause duration
  • Battery level indicator
  • Battery included


Models & Accessories

Model Number/Name Description
TS25D test set with 346A plug
TS25D test set with ABN
TS25D test set with ABN kit (includes pouch and earpiece)
Model Number/Name Description
Earpiece, TS25D test set
TS25D battery door with belt clip
Pouch only, TS25D



Return Loss

>14 dB (ref 600 Ω)

DC Resistance
150 Ω nominal
>1 MΩ

AC Impedance


600 Ω nominal; 300 Hz to 3400 Hz
>120 kΩ; 300 Hz to 3400 Hz

Rotary Dial Output

Pulsing Rate

10 pps ±1 pps

Break/Make Ratio


Interdigit Interval

>300 ms

Resistance During Break

>100 kΩ

DTMF Output

Tone Frequency Error

±1.5 % maximum

Tone Level

–1 dBm combined (typical)

High versus Low Tone difference

2 dB ± 2 dB

Memory Dialing

Memory Capacity

10 speed dial memories plus one last number redial memory

Digit Capacity

23 digits per memory

Pause Duration

User programmable Default: 4 seconds

Hook Flash Duration

User programmable Default: 600 ms

Automatic Speaker Shut Off Duration

User programmable TS25D default: 5 minutes TS25D CO default: 2 minutes


9 V alkaline or lithium battery



7.8 in x 2.7 in x 1.6 in (20 cm x 6.8 cm x 4 cm)


10 ounces (284 g)


Temperature Range Operating

32°F to 122 °F (0 °C to 50 °C)


-40 °F to 150 °F (-40 °C to 65 °C)


Up to 10,000 ft (3,000 m)

Relative Humidity

5 % to 95 %

Notes  Specifications subject to change without notice. This product has been safety certified for indoor use only.





Data Sheet

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TS25D Test Set Central Office Version Data Sheet
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521.29 KB


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Fluke Networks Products Overview
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Fluke Networks Solution Catalog

The Guide for selecting and ordering Fluke Network Solutions and Products

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Replacement Test Lead Safety Information
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TS25D Test Set Users Guide, Rev. 6
User Documentation
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254.29 KB
TS25D Users Card, Rev. 1
User documentation
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252.98 KB

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