OTDR & Test Instruments

K-200 Optical Cable Identifier

Finds the one cable you want inside a manhole or duct full of identical ones: tap the cable, and the K-200 turns the knock into a tone and a bar reading — nothing is cut, bent or frozen.

Test method: Single fiber
Wavelength: 1550 nm
Fiber type: Single-mode
Maximum test distance: 40 km or 100 km (by version)
Unidirectional fiber loss: 10 dB (40 km version); 30 dB (100 km version)

40 km version100 km version

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Key features

Non-invasive identification: the photo-elastic effect turns a gentle tap on the target cable into audio and visual signals — the fiber is never cut, bent or frozen, and live traffic on it is untouched
Two reaches: 40 km and 100 km versions, working over a single fiber at 1550 nm, with no initial blind zone
Reads by ear and by eye: the sound tracks how hard the cable is knocked, while the screen shows a bar chart or ECG trace — usable in a noisy street cabinet or a quiet plant room
Works with PC, APC or cut fiber ends, and in manholes, tunnels, conduits and aerial spans alike
5.6-inch touch screen plus buttons, ten hours or more on the built-in lithium battery, 1.5 kg complete

Specifications

Test method	Single fiber
Wavelength	1550 nm
Fiber type	Single-mode
Maximum test distance	40 km or 100 km (by version)
Unidirectional fiber loss	10 dB (40 km version); 30 dB (100 km version)
Initial blind zone	None
Fiber-end return loss requirement	≤40 dB (40 km version); ≤20 dB (100 km version)
SNR	≥25 dB
Optic connector	FC/APC
Display	5.6 in LCD touch screen
Input	Touch screen + buttons
Output	Visual: bar chart or ECG display; Audio: sound tracking the knock intensity
Battery	Lithium 7.4 V, 10.4 Ah — ≥10 h continuous work
Power consumption	<6 W
Power supply	DC 12 V / 3 A
Dimensions	65 × 150 × 235 mm
Weight	1.5 kg (including battery)
Working temperature	0 °C to +45 °C
Storage temperature	-20 °C to +55 °C

Where it works

Picking the target cable out of a crowded manhole, duct or tunnel run before cutting or splicing
Verifying cable identity where records are wrong or labels are missing
Aerial, conduit and buried routes where several operators' cables share the path
Pre-work confirmation on live cables that cannot be interrupted for identification