AT-RH505BE Allied Telesyn Controller module

Description

AT-RH505BE Allied Telesyn Controller module

Product Dimensions：

Product Description

The Allied Telesyn (now Allied Telesis) AT-RH505BE is a legacy industrial-grade micro-hub. It is a 5-port 10Base-T Ethernet Hub featuring an additional BNC (10Base2) port. This device was designed to provide a compact and reliable solution for small workgroups or for bridging twisted-pair networks with coaxial-based “Thinnet” segments.

Product Parameters

Key Product Advantages

• Media Conversion (Bridge Capability): It functions as a gateway between modern (at the time) RJ45 star topologies and older BNC daisy-chain topologies.

• Plug-and-Play Simplicity: As a “dumb” hub (unmanaged), it requires no software configuration. It broadcasts incoming data to all ports automatically.

• Compact “Micro” Form Factor: Its small footprint makes it ideal for installation in tight spaces, such as desktop environments or small wiring closets.

• Diagnostic LEDs: Provides instant visual feedback on network health, specifically showing “Collision” status, which is vital for troubleshooting older half-duplex networks.

• Allied Telesyn Reliability: Known for high MTBF (Mean Time Between Failures), these units were built to last in industrial and commercial environments.

Product Applications

• Legacy Systems Maintenance: Connecting older industrial machines (like CNCs or older PLCs) that only have BNC interfaces to a more modern RJ45 network.

• Small Workgroup Hub: Creating a localized 10 Mbps network for a small cluster of devices.

• Field Service/Troubleshooting: Used by network technicians to tap into legacy coaxial segments for diagnostic purposes.

• Educational/Lab Use: Demonstrating older networking topologies and collision domains in academic settings.

Important Usage Notes (Precautions)

• BNC Termination: If the BNC port is used, the coaxial segment must be terminated with 50-ohm resistors at both ends. Failure to do so will cause signal reflection and crash the network.

• Half-Duplex Only: Unlike modern switches, this is a hub. Only one device can transmit at a time. High traffic volume will lead to increased collisions and reduced performance.

• Speed Constraint: This device is limited to 10 Mbps. It will not support 100 Mbps (Fast Ethernet) or 1000 Mbps (Gigabit) speeds. Connecting it to a modern high-speed switch may require manual port configuration on the switch side to lock the speed at 10 Mbps.

• Daisy Chaining: Follow the “5-4-3 rule” for 10 Mbps Ethernet (maximum 5 segments, 4 hubs, 3 populated segments) to avoid timing issues (late collisions).

Port Configuration Tip

The AT-RH505BE often includes an “Uplink” or “MDI/MDI-X” switch (or a dedicated port) to allow connection to another hub without needing a crossover cable. Ensure this switch is in the correct position depending on whether you are connecting a PC (Workstation) or another Hub/Switch.

Shipping Port: Xiamen, China

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