1. Product Overview

Product Name: AT-MC104XL
Model / Series: Allied Telesyn Fast Ethernet Media Converter Series
Article Number: AT-MC104XL (Part No. 617-00275-05)
Manufacturer: Allied Telesyn International Corp.
Product Type: SM Fiber SC to MM Fiber SC Media Converter
Description: The Allied Telesyn AT-MC104XL is a compact, standalone or rack-mountable Fast Ethernet media converter designed to extend network reach by bridging single-mode (SM) and multi-mode (MM) fiber optic segments. It enables seamless conversion between different fiber types while maintaining full 100 Mbps Fast Ethernet performance.

The AT-MC104XL is part of Allied Telesyn’s family of high-performance media converters that support both single-mode and multi-mode fiber optic connections, allowing network administrators to expand twisted-pair or fiber-based networks over long distances—up to 40 km depending on configuration.

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2. Key Features

- Fiber Type Conversion: Converts between single-mode (SM) and multi-mode (MM) fiber optic connections using SC connectors.
- Auto-Negotiation: Automatically detects and configures full-duplex or half-duplex operation when connected to Fast Ethernet auto-negotiation switches, ensuring optimal bandwidth utilization.
- “Missing Link” Function: Provides real-time link status reporting to network management systems. If a fiber link fails, the converter signals the connected switch, enabling automatic failover to redundant links.
- Link Test Function: Allows verification of fiber link integrity without external test equipment. Users can activate a built-in link test mode to identify cable faults quickly.
- Flexible Deployment: Operates as a standalone unit with an external power supply or can be installed in a 19” rack chassis accommodating up to 12 converters.
- Redundant Power Options: The rack chassis supports dual internal power supplies for load sharing and redundancy in mission-critical environments.
- Compact and Lightweight: Small form factor (105 × 95 × 25 mm) and low weight (294 g) make it ideal for desktop or rack-mounted installations.
- Comprehensive LED Indicators: Front panel LEDs provide clear visual feedback for power, link status, data reception, and test mode operation.
- Wide Environmental Tolerance: Operates reliably in temperatures from 0°C to 50°C and humidity up to 80% non-condensing.
- Lifetime Warranty and Support: Allied Telesyn provides an unlimited functional warranty and free technical support for all Fast Ethernet media converters.

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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 Interfaces:
- Connector Type: SC (for both SM and MM fiber)
- Supported Fiber Types: 62.5/125 µm, 50/125 µm, 100/140 µm, 85/125 µm

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

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

Optical Performance (Singlemode 100BaseFX):
- Wavelength: 1300 nm (typical), range 1261–1360 nm
- Receiver Sensitivity: -31 dBm
- Optical Output Power: Typical -13.9 dBm (Min -15 dBm, Max -8 dBm)

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

Twisted Pair Interface (100Base-TX):
- Differential Output Voltage: Typ. 980 mV (Min 950 mV, Max 1050 mV)
- Overshoot Voltage: Typ. 4%, Max 5%
- Amplitude Symmetry: Typ. 1.0062 (Min 0.98, Max 1.02)
- Rise Time: Typ. 4.6 ns (Min 3.0 ns, Max 5.0 ns)
- Fall Time: Typ. 4.2 ns (Min 3.0 ns, Max 5.0 ns)
- Rise/Fall Time Symmetry: Typ. 0.4 ns, Max 0.5 ns

Transmission Performance:
- Round Trip Delay: 0.4 µs maximum
- Bit Error Rate (BER): < 10⁻⁹

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 (Half Duplex): 412 m
- Singlemode Long Haul (Full Duplex): 40 km
- Singlemode Long Haul (Half Duplex): 412 m

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4. Functionality

The AT-MC104XL functions as a transparent media converter between single-mode and multi-mode fiber optic segments in a Fast Ethernet network. It operates at the physical layer (Layer 1) and provides seamless data transmission without altering frame structure or timing.

Operation:
- The converter receives optical signals from one fiber type (e.g., single-mode) and retransmits them on another (e.g., multi-mode), maintaining 100 Mbps throughput.
- Auto-negotiation ensures optimal duplex mode selection when connected to compatible switches.
- The “Missing Link” feature propagates link status changes across the network, enabling intelligent redundancy and fault detection.
- The built-in link test mode allows users to verify fiber integrity by looping back signals between paired converters.

Use Cases and Applications:
- Extending Fast Ethernet networks across campuses or between buildings.
- Integrating legacy multi-mode fiber segments with newer single-mode infrastructure.
- Providing long-distance connections up to 40 km for industrial, enterprise, or telecom environments.
- Supporting redundant network topologies requiring link fault signaling.
- Ideal for data centers, metropolitan area networks (MANs), and remote site connectivity.

Compatibility:
- Fully compatible with IEEE 802.3u 100Base-FX and 100Base-TX standards.
- Works with Allied Telesyn switches, hubs, and network interface cards, as well as third-party Fast Ethernet equipment.

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5. Components & Accessories

Included Items:
- AT-MC104XL 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
- Fiber patch cables (SC-SC, single-mode or multi-mode)
- Twisted pair Cat 5/5e Ethernet cables

Front Panel Indicators:
- Power: Indicates converter power status
- Link (2): Displays valid link on each fiber port
- Receive (2): Indicates data reception activity
- Normal/Test: Shows operational mode (normal or fiber test)

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6. Installation & Setup

Requirements:
- Power source providing 12 VDC ±5%
- Appropriate fiber optic cables (SC connectors)
- Category 5 twisted pair cable for copper connections

Mounting Options:
- Standalone: Operates independently using the included external power supply.
- Rack-Mount: Up to 12 units can be installed in a 19” rack chassis for centralized power and management.

Configuration:
- Plug-and-play operation; no software configuration required.
- Internal MDI/MDIX switch allows direct connection to PCs, hubs, or switches using standard TP cables.
- Link test mode can be activated to verify fiber connectivity before deployment.

Setup Steps:
1. Connect the single-mode and multi-mode fiber cables to the respective SC ports.
2. Connect the twisted pair cable to the Ethernet port.
3. Apply power using the external adapter or rack chassis supply.
4. Verify LED indicators for power and link status.
5. Optionally, perform a link test to confirm fiber integrity.

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7. Performance & Capabilities

Speed: 100 Mbps Fast Ethernet (full or half duplex)
Distance: Up to 40 km (single-mode long haul)
Efficiency: Transparent conversion with minimal latency (0.4 µs round trip delay)
Reliability: BER < 10⁻⁹ ensures high data integrity
Scalability: Supports multiple converters in a single chassis for large-scale deployments
Limitations:
- Designed for Fast Ethernet (100 Mbps) only; not suitable for Gigabit Ethernet.
- Maximum copper cable length limited to 100 m (Cat 5).
- Fiber distance depends on mode and duplex configuration.

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8. Standards & Compliance

Network Standards:
- IEEE 802.3u 100Base-TX / 100Base-FX compliant

Safety and EMC Certifications:
- UL (Underwriters Laboratories)
- CSA (Canadian Standards Association)
- TÜV (Technischer Überwachungsverein)
- IEC 825-1 (Laser Safety)
- FCC Class A (Electromagnetic Compatibility)
- IC Class A (Industry Canada)
- CE Mark (European Conformity)

Environmental Compliance:
- RoHS compliant (lead-free construction)
- Designed for reliable operation in commercial and industrial environments

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9. Additional Information

Warranty:
Allied Telesyn provides an unlimited functional warranty for the AT-MC104XL, ensuring long-term reliability and peace of mind.

Technical Support:
Free lifetime technical support is available through Allied Telesyn’s regional offices and online resources.

Maintenance:
- No moving parts; minimal maintenance required.
- Periodic inspection of fiber connectors recommended to maintain optimal signal quality.
- Firmware updates not required, as the device operates at the physical layer.

Service and Replacement:
- Hot-swappable when used in rack chassis configurations.
- Replacement units available through Allied Telesyn distributors.

Manufacturer Contact Information (Europe):
- United Kingdom: Allied Telesyn International Ltd., 70 Milton Park, Abingdon, Oxon, OX14 4RX
- Germany (North): Allied Telesyn International GmbH, Wittestraße 30N, 13509 Berlin
- Germany (South): Allied Telesyn International GmbH, Gute Änger 13, 85356 Freising
- Austria (Eastern Europe): Allied Telesyn International GmbH, Fleschgasse 32/6, 1130 Wien
- France: Allied Telesyn International S.A., 6 Avenue des Andes, Bâtiment 5, 91952 Les Ulis Cedex
- Italy: Allied Telesyn International Srl, Via Anna Kuliscioff 31, 20152 Milano
- Spain: Allied Telesyn International Srl, Orense 85, 28020 Madrid

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

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Summary

The Allied Telesyn AT-MC104XL is a robust, high-performance Fast Ethernet media converter engineered for professional network environments requiring reliable fiber type conversion between single-mode and multi-mode SC fiber connections. With advanced features such as auto-negotiation, “Missing Link” fault propagation, and integrated link testing, it ensures seamless network extension and fault-tolerant operation.

Its compact design, flexible installation options, and compliance with international safety and EMC standards make it suitable for enterprise, industrial, and telecommunications applications. Backed by Allied Telesyn’s lifetime warranty and global support network, the AT-MC104XL delivers dependable performance and long-term value for network infrastructure expansion.