GE DS200AAHAH1AED EX2000 ARCNET Hub LAN Driver Board

The GE DS200AAHAH1AED connects multiple EX2000 exciters into a single ARCNET network. This hub board distributes communication signals to up to eight excitation system controllers. Therefore, it enables coordinated voltage regulation across parallel generators.

Product Overview

We engineered this hub specifically for EX2000 excitation system networks. Its active signal regeneration maintains data integrity over long cable runs. Moreover, this unit includes LED indicators for rapid fault diagnosis.

Technical Specifications

Parameter	Specification
Dimensions	28.7 cm (length) x 12.7 cm (width)
Weight	0.43 kg (approximately 0.95 lb)
Interface Type	Single 64-pin backplane plus 8 BNC ports
Component Count	162 components including dual transceivers per port
Energy Storage	6 aluminum capacitors (220 µF, 16V) plus 14 ceramic
Network Protocol	ARCNET (ANSI 878.1) active hub
Port Count	8 active ports with individual isolation
Data Rate	2.5 Mbps or 5 Mbps selectable
Cable Type	RG-62 coaxial, 93 ohm characteristic impedance
Max Cable Length	2500 feet (762 meters) per port at 2.5 Mbps
Repeater Gain	20 dB per port for signal restoration
Power Draw	5V DC at 0.9A from backplane

Active Hub Design

The GE DS200AAHAH1AED uses six aluminum capacitors for power rail smoothing. Each port contains two transceivers for full-duplex signal regeneration. Additionally, the board features selectable baud rate for network flexibility. You can mix 2.5 Mbps and 5 Mbps devices on separate ports.

Energy Storage Configuration

Six aluminum capacitors provide 30 ms of hold-up for all hub electronics. Fourteen ceramic capacitors decouple high-frequency noise on each power rail. Each port receives dedicated filtering with two ceramic capacitors. This per-port filtering prevents noise coupling between different network segments. Clean power ensures error-free communication for critical excitation control.

Baud Rate Selection

Set the network speed using the two-position jumper block. Jumper in position J1 selects 2.5 Mbps for standard ARCNET networks. Position J2 selects 5 Mbps for high-speed applications with shorter cables. All ports operate at the same selected baud rate simultaneously. You cannot mix different speeds on different ports of one hub. External nodes must match the hub’s selected baud rate exactly.

Installation Steps

Insert this hub board into any EX2000 rack slot with 64-pin backplane. Align the GE DS200AAHAH1AED carefully with its card guide rails. Push the board straight in until the backplane connector locks fully. Then secure the front panel with its two captive retaining screws. Connect each excitation controller to an available BNC port.

Node Isolation Logic

The hub monitors each port for signal quality and error rates. Upon detecting excessive errors, it electrically isolates that port. The isolation prevents a faulty exciter from disrupting other controllers. The hub retests the isolated port once per second continuously. Normal operation resumes automatically when communication improves. This feature proves essential for redundant excitation systems.

Diagnostic Features

Each port includes two status LEDs for detailed diagnostics. A green LED flashes for each packet received correctly. A yellow LED illuminates when the port isolates a faulty node. Additionally, a master power LED indicates overall hub health. The GE DS200AAHAH1AED also provides test points for oscilloscope connection. You can verify signal quality at each port using standard test equipment.

EX2000 Application Notes

This hub board works exclusively with GE EX2000 excitation systems. It replaces older passive repeater boxes with active intelligence. Many hydroelectric plants use the GE DS200AAHAH1AED for generator field control networks. Its robust design withstands the high EMI environment near generator terminals.