Condition: Used — in working condition. Multiple units are available in stock.

The Viavi MTS 4000 is a modular, field-portable test platform housing the 4126 MA single-mode OTDR module operating at 1310nm and 1550nm with an SC-APC optical connector. This combination is widely used by fibre network engineers for commissioning, acceptance testing, maintenance, and fault diagnosis on single-mode fibre optic infrastructure.

The 4126 MA OTDR module provides dual-wavelength testing capability, enabling users to characterise fibre loss, measure link length, identify reflective and non-reflective events, and locate faults with precision. The MTS 4000 mainframe offers a robust, ergonomic handheld design suited to field environments.

Included in the sale:
• Viavi MTS 4000 mainframe
• 4126 MA SM OTDR module (1310/1550nm, SC-APC)

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 modular, handheld field test platform designed for fibre optic network testing. Its open-slot architecture accepts a wide range of interchangeable test modules, making it a versatile solution for installation, commissioning, and maintenance of optical networks.

The 4126 MA module is a single-mode OTDR designed for the MTS 4000 platform, providing dual-wavelength testing at 1310nm and 1550nm through an SC-APC optical port. It enables full characterisation of single-mode fibre links including measurement of fibre length, loss, optical return loss (ORL), splice loss, connector loss, and fault location.

Key Specifications:
Platform: Viavi MTS 4000 Mainframe
Module: 4126 MA SM OTDR
Fibre Type: Single-mode (SM)
Wavelengths: 1310nm / 1550nm
Connector: SC-APC
Form Factor: Modular, field-portable handheld
Display: Colour LCD touchscreen (MTS 4000 mainframe)
Power: Rechargeable battery with AC mains charging
Data Storage: Internal memory and removable media
Standards: ITU-T G.650, IEC 61746
Applications: Fibre acceptance testing, network commissioning, fault location, maintenance, splice and connector loss measurement

The MTS 4000 platform supports field-interchangeable modules including OTDRs, optical spectrum analysers, power meters, and light sources, allowing a single mainframe to serve multiple test disciplines. Its rugged construction and battery-powered operation make it well suited to outside plant and data centre fibre testing environments.

Viavi MTS 4000 OTDR platform product page and documentation: Download PDF

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.