Overview
The VIAVI T‑BERD/MTS‑2000 handheld mainframe fitted with the E4126MA (4126MA) Metro‑Access OTDR and Option FC‑S is a compact, field‑ready OTDR designed for installing, commissioning, and troubleshooting fiber networks in FTTx, metro/access, enterprise, and wireless backhaul environments. Key integrated specs: wavelengths 1310 nm and 1550 nm, dynamic range up to ~43 dB, display range 0.5 km–260 km, sampling resolution 4 cm, and attenuation display resolution 0.001 dB. The unit combines high resolution for short events with sufficient dynamic range for long metro links, plus smart software to simplify testing and reporting.
Optical and Measurement Specifications
- Wavelengths: 1310 nm, 1550 nm.
- Dynamic range: Up to 43 dB depending on pulse width and settings.
- Display range: 0.5 km to 260 km configurable per test.
- Sampling resolution: 4 cm; cursor resolution 1 cm.
- Maximum data points: Up to 128k–256k for detailed trace capture.
- Distance accuracy: ±1 m ± sampling resolution ± (1\times10^{-5}) × distance (excludes group index uncertainty).
- Attenuation resolution: 0.001 dB display resolution; reflectance accuracy ±2 dB.
- Laser safety: Class 1.
Physical, Source, and Interface Details
- Form factor: Handheld modular mainframe (T‑BERD/MTS‑2000) with one OTDR slot.
- Typical module size and weight: Compact, field‑portable module designed for easy insertion and removal.
- Optical port: Single port with interchangeable adapters; Option FC‑S configures the port for FC connectors.
- CW source and power meter: Module/mainframe options can include an integrated CW light source and broadband power meter; typical CW output and power meter ranges vary by configuration and are useful for IL/ORL and power checks.
- Connectivity and software: USB, Ethernet, Bluetooth, Wi‑Fi (dependent on mainframe options); supports Smart Link Mapper (SLM), SmartAcq, and automated test modes.
Options and How They Change Functionality
Option FC‑S (FC connector fitted)
- What it does: Provides an FC‑terminated optical adapter on the OTDR port.
- Benefit: Eliminates the need for mating sleeves or adapters when working with FC‑terminated patchcords, reducing insertion loss uncertainty and simplifying field hookups.
Additional wavelengths (1625 nm / 1650 nm)
- What they do: Add in‑service and live‑fiber testing capability.
- Benefit: Allow fault locating on live networks and testing through PON splitters without taking traffic down.
Integrated CW source and broadband power meter
- What they do: Provide loss reference and power measurement in the same tool.
- Benefit: Enable insertion loss and return loss checks without a separate instrument, speeding turn‑up and verification.
SmartAcq and multi‑pulse acquisition
- What it does: Automatically captures short and long pulses in one acquisition.
- Benefit: Reveals both near and far events (short jumpers and distant splices) without repeated tests or long launch cables.
Smart Link Mapper and SmartTEST
- What they do: Icon‑based mapping and guided test sequences.
- Benefit: Simplifies result interpretation, produces instant pass/fail outputs, and reduces technician training time.
Practical Use Cases
- FTTx and PON commissioning: Test feeder and distribution fibers, verify splitter links, and produce pass/fail reports for each drop.
- Metro/access maintenance: Locate bends, breaks, and high‑loss splices on ring or linear networks; use in‑service wavelengths to troubleshoot live fibers.
- Contractor acceptance testing: Qualify short jumpers, patch panels, and splice enclosures with short dead‑zone and high sampling resolution.
- Routine audits and trend tracking: Capture baseline traces for future comparison to detect gradual degradation and validate repairs.