1. Product Overview

Product Name: SM Fiber SC LH to UTP Media Converter
Model: AT-MC103LH
Series: Allied Telesyn Fast Ethernet Media Converter Series
Article Number: AT-MC103LH / 617-00275-05
Manufacturer: Allied Telesyn International Corp.

The Allied Telesyn AT-MC103LH is a single-mode fiber (SM) to unshielded twisted pair (UTP) media converter designed to extend the reach of Ethernet networks over long distances using fiber optic cabling. It provides seamless conversion between 100Base-FX fiber and 100Base-TX copper interfaces, supporting both full-duplex and half-duplex operation modes. The unit is part of Allied Telesyn’s professional-grade media converter family, known for reliability, ease of installation, and robust performance in enterprise and industrial networking environments.

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2. Key Features

- Media Conversion: Converts 100Base-TX (UTP) to 100Base-FX (single-mode fiber) for extended network reach.
- Long-Haul Capability: Supports single-mode long-haul (LH) fiber connections up to 40 km in full-duplex mode.
- Auto-Negotiation: Automatically detects and configures full- or half-duplex operation when connected to Fast Ethernet auto-negotiation switches.
- “Missing Link” Function: Provides link fault signaling between fiber and copper segments, enabling network management systems to detect and respond to link failures.
- Link Test Function: Allows verification of fiber link integrity without external test equipment.
- MDI/MDIX Auto-Switching: Built-in crossover detection allows direct connection to PCs, hubs, or switches using standard twisted pair cables.
- Standalone or Rack-Mountable: Operates as a standalone unit with external power supply or can be installed in a 19” rack chassis accommodating up to 12 converters.
- LED Indicators: Front panel LEDs for power, link status, data reception, and test mode provide clear visual diagnostics.
- High Reliability: Backed by Allied Telesyn’s lifetime functional warranty and free technical support.
- Compact Design: Small form factor suitable for desktop or rack-mounted installations.

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3. Technical Specifications

- Dimensions: 105 mm (W) × 95 mm (D) × 25 mm (H)
- Weight: 294 g
- Housing Material: Metal enclosure for electromagnetic shielding and durability
- Operating Temperature: 0°C to +50°C
- Storage Temperature: -20°C to +80°C
- Relative Humidity: 5% to 80% (non-condensing)
- Power Supply: External 12 VDC ±5% adapter
- Power Consumption: 6 W (maximum 500 mA current draw)
- Round Trip Delay: 0.4 µs maximum
- Bit Error Rate (BER): < 10⁻⁹

Electrical/Mechanical Certifications:
- EMC: FCC Class A, IC Class A
- Safety: UL, CSA, TÜV, IEC 825-1
- CE compliant

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4. Functionality

The AT-MC103LH functions as a transparent media converter between copper-based Ethernet and fiber optic networks. It receives electrical Ethernet signals on the twisted pair port and converts them into optical signals for transmission over single-mode fiber, and vice versa. This allows network administrators to extend Ethernet connections far beyond the 100-meter limitation of copper cabling.

Use Cases and Applications:
- Extending LAN segments between buildings or across campuses.
- Connecting remote switches, routers, or servers via fiber backbone.
- Integrating legacy copper-based equipment into fiber infrastructures.
- Providing redundant fiber links with automatic failover using the “Missing Link” feature.
- Industrial and enterprise environments requiring long-distance, interference-free data transmission.

Compatibility:
- Compatible with IEEE 802.3u 100Base-TX and 100Base-FX standards.
- Works with both multimode and single-mode fiber systems (depending on model variant).
- Supports standard SC fiber connectors and RJ-45 UTP connectors.
- Interoperable with Allied Telesyn switches, hubs, and other Ethernet devices.

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5. Components & Accessories

Included Items:
- AT-MC103LH media converter unit
- External 12 VDC power adapter
- User documentation and installation guide

Optional Accessories:
- 19” rack-mount chassis for up to 12 converters
- Redundant internal power supply module for chassis
- Fiber patch cables (SC connectors)
- UTP Category 5 or higher Ethernet cables

Connectors:
- Fiber Port: SC connector, single-mode long-haul (LH)
- Copper Port: RJ-45 connector for 100Base-TX UTP
- Power Connector: DC barrel jack for external power supply

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6. Installation & Setup

Requirements:
- 12 VDC power source (included external adapter)
- Appropriate fiber optic cabling (single-mode, SC connector)
- Category 5 or better twisted pair cable for copper connection

Mounting Options:
- Standalone: Desktop or wall-mounted operation using the external power adapter.
- Rack-Mount: Up to 12 units can be installed in a 19” Allied Telesyn rack chassis, powered by a shared internal supply. Optional redundant power supply ensures continuous operation in critical environments.

Configuration:
- Plug-and-play operation; no software configuration required.
- Auto-negotiation automatically sets duplex mode.
- MDI/MDIX auto-sensing eliminates need for crossover cables.
- Link Test mode can be activated to verify fiber connection integrity.
- LED indicators provide immediate feedback on link and power status.

Front Panel Indicators:
- Power: Indicates converter is powered.
- Link (2): Shows valid link on fiber and copper ports.
- Receive (2): Indicates data reception activity.
- Normal/Test: Switches between normal operation and fiber link test mode.

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7. Performance & Capabilities

Transmission Distances:
- Twisted Pair (Category 5): Up to 100 m
- Fiber Multimode (Full Duplex): Up to 2,000 m
- Fiber Multimode (Half Duplex): Up to 412 m
- Fiber Single-Mode (Full Duplex): Up to 15 km
- Fiber Single-Mode Long-Haul (Full Duplex): Up to 40 km
- Fiber Single-Mode (Half Duplex): Up to 412 m

Optical Interface (Single-Mode Long-Haul):
- Wavelength: TX 1280–1335 nm, RX 1260–1360 nm
- Typical Output Power: -3 dBm
- Output Power Range: -5 to 0 dBm
- Receiver Sensitivity: Typical -38 dBm, maximum -35 dBm

Optical Interface (Single-Mode Standard 100BaseFX):
- Wavelength: 1300 nm (1261–1360 nm range)
- Receiver Sensitivity: -31 dBm
- Optical Output Power: Typical -13.9 dBm (min -15 dBm, max -8 dBm)

Optical Interface (Multimode 100FX):
- Wavelength: 1300 nm (1200–1300 nm range)
- Receiver Sensitivity: -34.5 dBm
- Maximum Output Power: -14 dBm

Optical Interface (Multimode 100SX):
- Wavelength: 830 nm (810–850 nm range)
- Receiver Sensitivity: -30 dBm
- Maximum Output Power: -12 dBm

Transmitter Output Power (Fiber Types):
- 62.5/125 µm: -16.8 dBm
- 50/125 µm: -20.3 dBm
- 100/140 µm and 85/125 µm supported

Twisted Pair Electrical Characteristics:
- Differential Output Voltage: Typical 980 mV (min 950 mV, max 1050 mV)
- Overshoot Voltage: Typical 4%, max 5%
- Amplitude Symmetry: Typical 1.0062 (min 0.98, max 1.02)
- Rise Time: Typical 4.6 ns (3.0–5.0 ns range)
- Fall Time: Typical 4.2 ns (3.0–5.0 ns range)
- Rise/Fall Time Symmetry: Typical 0.4 ns, max 0.5 ns

Performance Summary:
- Supports 100 Mbps Fast Ethernet throughput.
- Full-duplex operation doubles effective bandwidth to 200 Mbps.
- Low latency and minimal signal degradation over long distances.
- BER < 10⁻⁹ ensures high data integrity.
- Designed for continuous 24/7 operation in enterprise environments.

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8. Standards & Compliance

Network Standards:
- IEEE 802.3u 100Base-TX / 100Base-FX compliant
- Supports full- and half-duplex Ethernet operation

Safety and Regulatory Compliance:
- EMC: FCC Class A, IC Class A (industrial/commercial environments)
- Safety: UL, CSA, TÜV certified
- Optical Safety: IEC 825-1 compliant (laser safety standard)
- CE Mark: Conforms to European safety and EMC directives

Environmental Compliance:
- Operating temperature range suitable for office and light industrial use.
- Non-condensing humidity tolerance up to 80%.
- RoHS compliance (for later production versions).

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9. Additional Information

Warranty and Support:
- Lifetime functional warranty provided by Allied Telesyn.
- Free technical support for installation and troubleshooting.
- Global service network with regional offices across Europe (UK, Germany, Austria, France, Italy, Spain).

Maintenance:
- No moving parts; minimal maintenance required.
- Periodic inspection of fiber connectors recommended to ensure optimal signal quality.
- Firmware updates not required; hardware-based operation ensures stability.

Product Lifecycle and Updates:
- Designed for long-term deployment in enterprise and industrial networks.
- Compatible with Allied Telesyn’s rack-mount systems for scalable expansion.
- Backward compatible with existing 100Base-FX and 100Base-TX infrastructure.

Manufacturer Contact Information:
- Website: [www.alliedtelesyn.com](http://www.alliedtelesyn.com)
- Headquarters: Allied Telesyn International Corp.
- European Offices:
- United Kingdom: 70 Milton Park, Abingdon, Oxon, OX14 4RX
- Germany (North): Wittestraße 30N, 13509 Berlin
- Germany (South): Gute Änger 13, 85356 Freising
- Austria (Eastern Europe Office): Fleschgasse 32/6, 1130 Wien
- France: 6 Avenue des Andes, Bâtiment 5, 91952 Les Ulis Cedex
- Italy: Via Anna Kuliscioff 31, 20152 Milano
- Spain: Orense 85, 28020 Madrid

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Summary

The Allied Telesyn AT-MC103LH is a professional-grade single-mode long-haul fiber to UTP media converter engineered for high-performance Fast Ethernet applications. It enables network administrators to extend copper-based Ethernet networks up to 40 km over fiber, ensuring reliable, interference-free communication across large campuses, industrial sites, or metropolitan areas. With features such as auto-negotiation, MDI/MDIX auto-sensing, link fault signaling, and link test diagnostics, the AT-MC103LH simplifies deployment and maintenance while maintaining high data integrity and uptime.

Its compact, durable design, broad environmental tolerance, and compliance with international safety and EMC standards make it suitable for mission-critical networking environments. Combined with Allied Telesyn’s lifetime warranty and global support infrastructure, the AT-MC103LH represents a robust, future-proof solution for extending Ethernet connectivity over long distances using single-mode fiber technology.