Condition: Used — in working condition. Multiple units are in stock and the cosmetic condition may vary between units.

The JDSU MTS 4000 is a modular, portable OTDR mainframe paired with the 4126 MA singlemode OTDR module, providing dual-wavelength testing at 1310nm and 1550nm. This combination is widely used by fibre optic engineers for network commissioning, routine maintenance, and fault diagnosis on singlemode fibre infrastructure. The modular MTS 4000 platform supports a range of interchangeable test modules, making it a versatile field instrument suitable for a broad range of optical network applications.

Please note that we have multiple units in stock, and the images presented are of one of them, therefore the cosmetic condition of the exact item you will receive may slightly differ.

The Viavi (formerly JDSU) MTS 4000 is a compact, modular field test platform designed for installation, maintenance, and troubleshooting of fibre optic networks. The mainframe accepts a range of interchangeable test modules, allowing technicians to configure the instrument for a wide variety of fibre measurement tasks without carrying multiple dedicated instruments.

The 4126 MA singlemode OTDR module provides dual-wavelength operation at 1310nm and 1550nm, enabling full characterisation of singlemode fibre links in a single test session. It delivers high dynamic range and precision event detection, making it suitable for both short- and long-haul fibre spans.

Key Specifications (4126 MA SM OTDR Module):
Wavelengths: 1310 nm / 1550 nm
Fibre Type: Singlemode (SM)
Typical Dynamic Range: Up to 40 dB (wavelength dependent)
Distance Range: Up to 260 km (wavelength dependent)
Event Dead Zone: Typically 1.5 m
Attenuation Dead Zone: Typically 8 m
Distance Accuracy: ±1 m or ±0.005% of distance
Pulse Widths: 3 ns to 20 µs
Connector Interface: Universal (interchangeable adapters)
Display: Colour LCD touchscreen
Data Storage: Internal memory and removable media
Power: Rechargeable Li-Ion battery and AC mains adapter
Compliance: TIA/EIA-568, IEC 61300, GR-196-CORE

The MTS 4000 platform is a trusted tool used globally by telecoms engineers, contractors, and network operators for fibre acceptance testing, loss and length measurement, splice and connector loss assessment, and fault localisation.

Product datasheet

Shipping & Returns Policy

Shipping Policy

• Processing Time: Orders are typically processed and dispatched within 1 business day.
• Shipping Methods: We offer Expedited Shipping to all destinations using UPS/DHL/Fedex/Royal Mail and other reputable carriers.
• Shipping Times: Mainland UK: 1-2 Business Days / Mainland Europe and USA: 2-3 Business Days / Rest of the World 5-7 Business Days.
• Shipping Costs: These are calculated at checkout based on the shipping method, destination and package dimensions.
• CUSTOMS AND TAXES: It is YOUR responsibility to liaise with customs in your country and ensure your package is cleared and any taxes are paid.
• Shipping Destinations: We ship worldwide.
• Tracking: Once your order is shipped, we will provide you with a tracking number via email.
• Insurance: All shipments are insured. In case of damage, please contact us via email within 48 hours of receiving the product with photographic evidence, please also ensure a report is logged with the delivery driver.

Returns Policy

• Return Period: In the event of an item being received which is not as specified, you can return your purchase within 14 days of delivery.
• Condition of Items: Items must be returned unused and in their original packaging.
• Return Method: All returns must be notified in writing to hello@ttinstruments.com, and the email should include the order number, date and reason for return within 14 days of delivery.
• Restocking Fees: A restocking fee of up-to 20% is applicable for items returned for any reason other than not as specified.
• Refund Method: Refunds are processed to the original method of payment within 5 business days of receiving the return.
• Exchanges: We do not offer exchanges. It will either be a replacement or a refund.
• Return Shipping Costs: Return shipping costs will be borne by the customer unless the item is not as specified, in which case we will arrange a prepaid return label.