Allied Telesis AT-DMC100/ST-90 MEDIA CONVERTER 100TX 100FXST FED

Product Overview

The Allied Telesis AT-DMC100/ST-90 is a TAA-compliant standalone Fast Ethernet media converter that bridges 100Base-TX copper (RJ-45) to 100Base-FX fiber using an ST bayonet connector. Part of Allied Telesis’ compact DMC series, this palm-sized unit measures just 1.25” wide × 3.6” deep × 0.85” high and requires no configuration out of the box. The ST connector version is specifically designed for networks and facilities where existing fiber infrastructure uses ST-terminated multimode cable — a connector type widely deployed in legacy enterprise campuses, government buildings, and industrial facilities. TAA compliance (FED suffix) qualifies this unit for federal and government procurement.

Product Description

The Allied Telesis AT-DMC100/ST-90 media converter with ST fiber connector converts 100Base-TX copper Ethernet to 100Base-FX multimode fiber, enabling administrators to extend copper-only network equipment across fiber segments without replacing existing ST-terminated cabling. The ST bayonet connector — the key differentiator from the SC and LC variants in the DMC100 family — is the right choice for legacy fiber infrastructure where ST remains the installed connector, particularly common in government buildings, manufacturing plants, and campus networks installed prior to the widespread adoption of SC and LC connectors. Auto MDI/MDI-X on the copper RJ-45 port eliminates crossover cable requirements regardless of whether you’re connecting to a switch, hub, or PC. Smart MissingLink (SML) monitors both network segments and propagates link-down state when either side loses connectivity, enabling accurate fault detection by network management systems. Smart Link Restoration automatically re-establishes links after power interruptions or outages without requiring manual reset or intervention. VLAN transparency ensures IEEE 802.1Q tagged packets pass through unmodified, maintaining compatibility with modern switch infrastructure. Power consumption is just 1.5W. Can be powered via AC adapter (included for this AC-powered variant) or via optional Micro USB connection. Available from Creation Networks at creationnetworks.net.

Key Features

• 100Base-TX to 100Base-FX/ST Conversion — Bridges copper RJ-45 and ST bayonet multimode fiber at 100Mbps Fast Ethernet speeds.
• ST Bayonet Fiber Connector — Connects to legacy ST-terminated multimode fiber; ideal for government, campus, and industrial legacy fiber plants.
• Auto MDI/MDI-X — Eliminates crossover cable requirements on the copper side for any connected device type.
• Smart MissingLink (SML) — Detects and propagates link failures across both ports for accurate network fault monitoring.
• Smart Link Restoration — Automatically recovers links after power failures without manual reset.
• Ultra Low Power (1.5W) — One of the most energy-efficient 100Mbps media converters in its class.
• TAA Compliant (FED) — Meets Trade Agreements Act requirements for federal and government procurement.

Typical Applications

• Extending 100Mbps copper Ethernet to legacy ST-terminated multimode fiber segments
• Connecting ST fiber infrastructure in government buildings and campus facilities to modern copper equipment
• Federal and government network installations requiring TAA-compliant media converters
• Industrial and manufacturing environments where ST fiber remains the installed standard
• Desktop or shelf deployments requiring a compact, low-power media converter

Technical Specifications

Frequently Asked Questions

Q: What is the difference between the AT-DMC100/ST-90, /SC-90, and /LC-90?

All three are identical 100Mbps Fast Ethernet media converters. The only difference is the fiber connector: /ST-90 uses an ST bayonet connector, /SC-90 uses an SC duplex connector, and /LC-90 uses an LC duplex connector. Choose the model that matches your existing fiber cable terminations.

Q: When should I choose ST over SC or LC?

Choose the ST variant when your existing fiber infrastructure is terminated with ST connectors. ST is common in legacy government buildings, university campuses, and manufacturing facilities installed before SC and LC became the dominant standards. If your fiber is newer, SC or LC are more likely.

Q: Does this converter require any configuration?

No. The AT-DMC100/ST-90 is plug-and-play with auto-negotiation and auto MDI/MDI-X. Connect both cables and the unit operates immediately.

Q: What is the power consumption?

Just 1.5W, making the AT-DMC100/ST-90 one of the most energy-efficient 100Mbps media converters available.

Q: Does the converter support IEEE 802.1Q VLAN tagging?

Yes. The DMC100/ST-90 passes 802.1Q VLAN-tagged packets transparently, ensuring full compatibility with managed switch infrastructure running VLANs.