1. Product Overview

Product Name: AT-MC105XL
Model / Series: Fast Ethernet Media Converter Series
Article Number: AT-MC105XL
Manufacturer: Allied Telesyn International Corp. (now Allied Telesis)
Product Type: MM Fiber ST 100BaseSX to UTP Media Converter

The Allied Telesyn AT-MC105XL is a compact, standalone Fast Ethernet media converter designed to extend the reach of twisted-pair (UTP) networks using multimode fiber optic cabling. It provides seamless conversion between 100BaseSX fiber and 100BaseTX copper Ethernet interfaces, enabling network administrators to integrate fiber segments into existing copper-based infrastructures. The device supports both full- and half-duplex operation, automatic negotiation, and diagnostic features such as “Missing Link” and link integrity testing.

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2. Key Features

- Media Conversion: Converts 100BaseSX multimode fiber (ST connector) to 100BaseTX twisted pair (RJ-45).
- Auto-Negotiation: Automatically detects and configures full- or half-duplex operation when connected to Fast Ethernet auto-negotiation switches.
- “Missing Link” Function: Provides real-time link status reporting to network management systems, ensuring redundancy and fault detection.
- Link Test Function: Allows verification of fiber link integrity without external test equipment.
- MDI/MDIX Auto-Crossover: Built-in switch enables direct connection to PCs, hubs, or switches using standard twisted-pair cables.
- Standalone or Rack-Mountable: Operates as an independent unit or can be installed in a 19” rack chassis accommodating up to 12 converters.
- Wide Fiber Support: Compatible with multimode and singlemode fiber types, supporting distances up to 40 km depending on configuration.
- Compact and Lightweight: Small form factor (105 × 95 × 25 mm) and low weight (294 g) for flexible deployment.
- High Reliability: Backed by Allied Telesyn’s lifetime functional warranty and free technical support.
- LED Indicators: Front panel LEDs for power, link status, data reception, and test mode.

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3. Technical Specifications

Physical Dimensions:
- Width: 105 mm
- Depth: 95 mm
- Height: 25 mm
- Weight: 294 g

Environmental Conditions:
- Operating Temperature: 0°C to +50°C
- Storage Temperature: -20°C to +80°C
- Relative Humidity: 5% to 80% (non-condensing)

Power Requirements:
- Power Supply: External 12 VDC ±5%
- Current Consumption: 500 mA
- Power Consumption: 6 W maximum
- Automatic range selection supported

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

Optical Characteristics (Multimode 100BaseSX):
- Wavelength: 830 nm (typical), range 810–850 nm
- Receiver Sensitivity: -30 dBm
- Maximum Optical Output Power: -12 dBm

Optical Characteristics (Multimode 100BaseFX):
- Wavelength: 1300 nm (typical), range 1200–1300 nm
- Receiver Sensitivity: -34.5 dBm
- Maximum Optical Output Power: -14 dBm

Optical Characteristics (Singlemode 100BaseFX):
- Wavelength: 1300 nm (typical), range 1261–1360 nm
- Receiver Sensitivity: -31 dBm
- Optical Output Power: -13.9 dBm typical (min -15 dBm, max -8 dBm)

Optical Characteristics (Singlemode Long Haul):
- Wavelength: TX 1280–1335 nm, RX 1260–1360 nm
- Receiver Sensitivity: -38 dBm typical, -35 dBm max
- Optical Output Power: -3 dBm typical (range -5 to 0 dBm)

Twisted Pair Interface (100BaseTX):
- Differential Output Voltage: 950–1050 mV (typical 980 mV)
- Overshoot Voltage: ≤5% (typical 4%)
- Amplitude Symmetry: 0.98–1.02 (typical 1.0062)
- Rise Time: 3.0–5.0 ns (typical 4.6 ns)
- Fall Time: 3.0–5.0 ns (typical 4.2 ns)
- Rise/Fall Time Symmetry: ≤0.5 ns (typical 0.4 ns)

Transmission Performance:
- Round Trip Delay: 0.4 µs maximum
- Bit Error Rate (BER): <10⁻¹⁰

Maximum Cable Distances:
- Twisted Pair (Cat 5): 100 m
- Multimode Fiber (Full Duplex): 2000 m
- Multimode Fiber (Half Duplex): 412 m
- Singlemode Fiber (Full Duplex): 15 km
- Singlemode Fiber Long Haul (Full Duplex): 40 km
- Singlemode Fiber (Half Duplex): 412 m

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4. Functionality

The AT-MC105XL functions as a transparent media converter between copper-based Ethernet and fiber optic segments. It operates at 100 Mbps and supports both 100BaseTX (UTP) and 100BaseSX (multimode fiber) standards. The device automatically negotiates duplex modes and link speeds with connected equipment, ensuring optimal throughput and minimal configuration effort.

Use Cases and Applications:
- Extending LAN segments beyond the 100-meter copper limitation using fiber optic cabling.
- Connecting remote switches, hubs, or workstations over fiber links.
- Integrating fiber backbones into existing copper-based Fast Ethernet networks.
- Providing redundant fiber paths in mission-critical environments using the “Missing Link” feature.
- Testing and verifying fiber link integrity during installation or maintenance.

Compatibility:
- Compatible with standard IEEE 802.3u 100BaseTX and 100BaseFX/SX devices.
- Works with both multimode and singlemode fiber optic cables.
- Supports ST-type fiber connectors and RJ-45 copper connectors.

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5. Components & Accessories

Included Items:
- AT-MC105XL media converter unit
- External 12 VDC power adapter
- User documentation and installation guide

Optional Accessories:
- 19” rack-mount chassis (supports up to 12 converters)
- Redundant internal power supply module for chassis installations
- Fiber patch cables (multimode or singlemode, ST connectors)
- UTP Category 5 or higher patch cables

Front Panel Indicators:
- Power: Indicates converter power status
- Link (2): Shows valid link on fiber and copper ports
- Receive (2): Indicates data reception activity
- Normal/Test: Switch for normal operation or fiber link test mode

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6. Installation & Setup

Requirements:
- Power source providing 12 VDC ±5%
- Appropriate fiber optic and UTP cabling
- Compatible network devices (switches, hubs, NICs)

Mounting Options:
- Standalone: Operates independently using the included external power supply.
- Rack-Mount: Up to 12 converters can be installed in a 19” chassis with shared internal power. Optional redundant power supply available for high-availability environments.

Configuration:
- Plug-and-play operation; no software configuration required.
- Auto-negotiation and MDI/MDIX eliminate manual setup.
- Link test mode can be activated to verify fiber connectivity.

Installation Steps:
1. Connect the fiber optic cable to the ST port.
2. Connect the UTP cable to the RJ-45 port.
3. Apply power using the external adapter or rack chassis supply.
4. Verify LED indicators for link and activity status.
5. Optionally perform a link test to confirm fiber integrity.

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7. Performance & Capabilities

The AT-MC105XL delivers reliable Fast Ethernet performance with minimal latency and low error rates. Its internal circuitry ensures signal integrity across both copper and fiber media, maintaining a BER below 10⁻¹⁰.

Speed and Throughput:
- Supports 100 Mbps full-duplex and half-duplex operation.
- Auto-negotiation ensures optimal link configuration.

Capacity and Range:
- Extends network reach up to 40 km using singlemode long-haul fiber.
- Supports standard 100 m copper connections.

Efficiency:
- Low power consumption (6 W).
- Compact design minimizes space and heat output.

Limitations:
- Operates only at 100 Mbps (no Gigabit support).
- Requires appropriate fiber type and connector matching.
- Environmental operation limited to 0–50°C.

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8. Standards & Compliance

Network Standards:
- IEEE 802.3u 100BaseTX / 100BaseFX / 100BaseSX

Safety and Regulatory Compliance:
- UL (Underwriters Laboratories)
- CSA (Canadian Standards Association)
- TÜV (Technischer Überwachungsverein)
- IEC 825-1 (Laser Safety)
- CE Mark (European Conformity)

Electromagnetic Compatibility (EMC):
- FCC Class A
- IC Class A

These certifications ensure that the AT-MC105XL meets international safety, electromagnetic, and performance standards for professional networking equipment.

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9. Additional Information

Warranty and Support:
Allied Telesyn provides a lifetime functional warranty for the AT-MC105XL, ensuring long-term reliability and customer confidence. Free technical support is included, offering assistance with installation, configuration, and troubleshooting.

Maintenance:
- No moving parts; minimal maintenance required.
- Periodic inspection of fiber connectors recommended to maintain signal quality.
- Firmware updates are not applicable, as the device operates on fixed hardware logic.

Service and Contact Information:
Allied Telesyn maintains multiple European offices for regional support and distribution:

- United Kingdom: Allied Telesyn International Ltd., 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, Z.A. de Courtaboeuf, 91952 Les Ulis Cedex
- Italy: Via Anna Kuliscioff 31, 20152 Milano
- Spain: Orense 85, 28020 Madrid

Corporate Website: [www.alliedtelesyn.com](http://www.alliedtelesyn.com)

Part Number: 617-00275-05

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Summary

The Allied Telesyn AT-MC105XL is a robust, high-performance Fast Ethernet media converter engineered for professional network environments requiring reliable copper-to-fiber connectivity. Its combination of automatic negotiation, diagnostic features, and flexible installation options make it ideal for extending LAN segments, integrating fiber backbones, and ensuring network redundancy. With comprehensive compliance certifications, low power consumption, and a lifetime warranty, the AT-MC105XL represents a dependable solution for enterprise and industrial networking applications requiring 100BaseSX to 100BaseTX conversion.