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Home / Products / Fiber Optic Testing Tools / OTDR / NK5600 / LF-069-Professional Telecom Grade OTDR Optical Time Domain Reflectometer for Long Haul Fiber Cable Testing

LF-069-Professional Telecom Grade OTDR Optical Time Domain Reflectometer for Long Haul Fiber Cable Testing

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Product Description

Telecom-Grade OTDR for Long-Haul Fiber Trace Analysis

Telecom-grade OTDR is designed for single-mode route commissioning, long-distance fault location, splice/connector analysis and documented acceptance. The NK5600 series uses 1310/1550 nm testing with model-defined dynamic range, short dead zones, adjustable pulse width and native trace storage so engineers can examine where loss and reflection occur along a link.

Long-distance capability is determined by the complete link budget and test settings, not only the 120 km screen range. Fibre attenuation, splitter loss, reflections, pulse energy, averaging time and noise floor all affect the usable trace. The exact NK5600A/B/C configuration and any live-line function must be approved before quotation.

Where the NK5600 OTDR Adds Project Value

Project stage	OTDR deliverable	Control point
Cable installation acceptance	Length, event map, splice/connector loss and reflection trace	Define wavelength, direction, thresholds and file naming before testing.
Long-haul maintenance	Distance to breaks, severe bends or degradation	Compare current trace with baseline and route records.
Splice quality investigation	Event loss and reflectance at each splice/connection	Use appropriate pulse/averaging and consider bidirectional analysis.
First/last connector acceptance	Characterise end connections with launch and receive fibres	Specify fibre type, length and connector polish with the kit.
Active network maintenance	Only on an approved filtered live-test port/procedure	Do not infer safe live testing from a generic optical signal threshold.

Dynamic Range, Dead Zone and Pulse Width Explained

The specified 28/26 dB dynamic range describes sensitivity under stated test conditions; it is not the same as the physical distance menu. Event dead zone determines how close two reflective events can be distinguished, while attenuation dead zone determines how soon a loss measurement can recover after reflection. Both matter on short links and patch panels even when the route itself is long.

Narrow pulses provide better spatial resolution; wide pulses improve reach but broaden dead zones. The IOR setting directly affects calculated distance. Native SOR files preserve the trace and settings for later review, while a PDF alone is convenient for handover but cannot replace the raw measurement data.

Technical Specifications

Parameter	Specification
Product Model	NK5600 Series (NK5600A/NK5600B/NK5600C)
Tool Type	High-Precision Multi-Functional Optical Time-Domain Reflectometer (OTDR)
Applicable Fiber Type	Single Mode (SM) Fiber (G.652/G.655/G.657)
Operating Wavelength	1310/1550nm±20nm; Supports live line test (Optical signal ≤-10dBm)
Dynamic Range	28dB (Typical, 1310nm); 26dB (Typical, 1550nm)
Event Blind Zone	0.8m (Min)
Attenuation Blind Zone	5m (Min)
Test Range	100m/1km/2km/4km/8km/16km/32km/64km/120km (Adjustable)
Pulse Width	1ns/3ns/5ns/10ns/20ns/30ns/50ns/80ns/160ns/320ns/500ns/800ns/1μs/2μs/5μs
Ranging Accuracy	±(0.3m + Sample Interval + 0.002% × Test Distance)
Linearity	±0.10dB/dB
Sample Points	64K ~ 256K (Adjustable)
Sample Resolution	0.01m ~ 5m (Adjustable)
Loss Resolution	0.001dB
Loss Threshold	0.10dB
Refractive Index (IOR)	1.45000 ~ 1.55000 (Adjustable, 0.00001 Step)
Reflection Accuracy	±1.5dB
File Format	SOR Standard File Format, Support PDF Report Batch Export & Printing
Laser Safety Class	Class II, Meets IEC 60825-1 International Laser Safety Standards
Optical Interface	FC/UPC (Interchangeable with SC/ST/LC Connectors via Adapter)
Integrated Functions	Multi-Functional Integration: Automatic OTDR, Expert OTDR, Event Map, OPM, VFL, Stable Light Source, Optical Loss Test, Test Result Automatic Diagnosis, Software Remote Upgrade
OPM Parameter	Test Range: -75dBm~+10dBm; Wavelength Range: 800~1700nm; 10 Calibration Wavelengths
Stable Light Source Parameter	Output Power: -5dBm~+2dBm Adjustable; Wavelength: 1310/1550nm
VFL Parameter	Wavelength: 650nm±10nm; Effective Distance: ≥15km; CW/Pulse Mode
Power Supply	Built-in 3.7V 5000mAh Rechargeable Li-ion Battery; AC/DC Adapter (100~240V, 1A); USB Charging Supported
Battery Life	≥10 Hours (Normal Operation at Room Temperature); Support Power Bank Charging
Display Screen	5.6-inch High-Definition Color Touch Screen, 800×480 Resolution, Touch & Key Dual Operation, Gesture Zoom, Screen Capture
Storage Capacity	Built-in 16G Memory, Support 300,000 Curve Storage; TF Card Expansion (Max 64G); File Name Support Chinese & English
Operating Temperature	-10°C to +55°C (Battery Charging: 0°C to +45°C)
Storage Temperature	-40°C to +75°C (Excluding Battery)
Relative Humidity	5%~95% (No Condensation)
Body Material	High-Strength Engineering Plastic, Anti-Drop (2m) and Wear-Resistant, IP65 Dustproof & Waterproof
Overall Dimensions	190mm × 115mm × 50mm (Handheld Ergonomic Design)
Net Weight	≈650g (Including Battery)
Certifications	CE, RoHS (Meets International Quality and Safety Standards)
Warranty Period	1 Year (Device Body); Consumables Excluded
Standard Package	1×NK5600 OTDR Host, 1×AC/DC Adapter, 1×FC/UPC Connector, 1×USB Data Cable, 1×User Manual, 1×Warranty Card, 1×Portable Storage Case, 1×Cleaning Kit, 1×Charging Cable

Configuration control: The detailed NK5600 table is retained. Values such as dynamic range, dead zones, drop protection, IP rating, integrated OPM/VFL/OLS functions and live-line capability must be verified for the ordered sub-model. IEC 61746-1 covers calibration of single-mode OTDR errors and uncertainties; request model/serial-specific calibration evidence where the tender requires it.

What OTDR Results Do and Do Not Prove

One-way splice loss: backscatter differences can create apparent gainers or exaggerated loss; contractual splice acceptance may require bidirectional averaging.
Automatic event analysis: useful for speed but dependent on thresholds; engineers should review trace shape and settings.
Long distance selection: a 120 km range setting does not mean every 120 km link is measurable with the stated accuracy.
Live-fibre claim: confirm filtered port, wavelength, isolation and operator procedure; standard 1310/1550 testing can interfere with service.
Integrated functions: built-in OPM/VFL/OLS are field conveniences and must be verified separately if used for formal acceptance.

Common Field-Failure Risks and Prevention

Risk	Result in the field	Prevention
No baseline trace	Future degradation cannot be separated from original events	Store approved SOR files at both wavelengths and defined directions.
Wrong IOR	Route and fault distance are wrong	Use project fibre data and include IOR in the test record.
Pulse too wide	Closely spaced events merge	Verify critical sections with narrower pulse and adequate averaging.
Dirty front-panel connector	Large reflection and repeatability problems	Inspect and clean the port plus launch cord before every test.
Only one direction tested	Splice loss can be misjudged	Specify bidirectional testing where acceptance accuracy requires it.
Live link connected to wrong port	Service disruption or receiver overload	Use only the approved live-test configuration and written method.

Pre-shipment Quality and Acceptance Plan

Verify sub-model, wavelength, dynamic range, dead zones, distance/pulse menus, optical interface and integrated functions.
Test known reference events for distance, loss and reflectance consistency at agreed settings.
Confirm SOR save/open/export, PDF generation, memory, naming, language, screen and software workflow.
Check battery endurance, charger, USB/TF functions, buttons/touch operation and protective housing.
Inspect optical port and accessories; match launch/receive fibres, adapters, cleaning kit, serial label and report.

B2B Buyer Guide: Information Required for an Accurate Quote

Maximum link length and estimated total loss, not distance alone.
Required wavelengths, dynamic range, event/attenuation dead zones and reporting standard.
Splice/connector density, splitter topology and whether bidirectional or baseline testing is required.
Live-fibre requirement with exact filtered wavelength/port and operator approval.
Launch/receive fibres, connectors, adapters, calibration evidence, SOR/PDF workflow, language, plug and warranty.

When a Mini OTDR or OPM/OLS Pair Is Better

Choose the 24/22 dB mini OTDR for compact FTTH access work where its range and dead zones are sufficient. Use an OPM with a stable light source when the contractual result is end-to-end insertion loss rather than an event trace.

MOQ, Samples, Lead Time and Packing

Commercial item	Standard arrangement
MOQ	Project-based quantity for test instruments; all configuration details can be customized to customer requirements.
Samples	Available according to customer requirements for functional and workflow approval.
Lead time	Normally 5–10 days after technical configuration and order confirmation for standard availability.
Packing	Protective bag or case plus export carton; project-specified packing available.
Customization	Function set, adapters, accessories, label, language, inspection documents and packing.

Related Fiber Testing Tools

Specify launch and receive fibres, inspection/cleaning tools, reference patch cords, adapters and an optical fibre identifier as one controlled kit. LinkFiber can provide consistent labels, manuals, accessory lists and pre-shipment records for project teams.

FAQ

Q：

What is a telecom grade OTDR fiber cable tester used for?

A：

A telecom grade OTDR fiber cable tester is used to locate fiber breaks, measure link length, analyze splice or connector events and create trace records for long-haul, metro and FTTH network acceptance. It helps engineers understand where loss and reflection occur along the cable.

Q：

How should buyers choose OTDR dynamic range for long-haul fiber testing?

A：

Buyers should choose OTDR dynamic range according to link length, fiber attenuation, connector/splice count and splitter loss. Long-haul routes need enough dynamic range and suitable pulse width so the far-end events can be seen without excessive noise.

Q：

Why do OTDR dead zones matter in fiber cable testing?

A：

Event dead zone and attenuation dead zone affect whether the OTDR can separate close connectors, patch cords or short events. For access networks and near-end testing, shorter dead zones help technicians identify faults close to the launch point more clearly.

Q：

Does an OTDR need a launch cable for accurate testing?

A：

Yes, a launch cable is recommended for accurate first-connector and near-end event analysis. It gives the OTDR enough distance before the first event, helping technicians evaluate connector loss and avoid blind-zone misjudgment.

Q：

What should B2B buyers confirm before ordering telecom grade OTDRs in bulk?

A：

B2B buyers should confirm wavelength, dynamic range, dead zone, pulse width, event analysis software, file format, battery life, connector type, live-fiber detection and included launch cable or accessories. These details affect project acceptance and after-sales support.

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