Alcatel-Lucent FB16401-A-I03 GTD-5 Analog Master/Slave Control Board – EGPQADC1XX
The Alcatel‑Lucent FB16401‑A‑I03 is a specialized analog master/slave control board designed for the GTD‑5 digital switching system. Identified by the hardware code EGPQADC1XX, this module provides critical supervision, signaling conversion, and line interface control for analog subscriber lines and trunk circuits in central office environments.
Product Overview
As part of the GTD‑5 family, this control board handles the analog front‑end functions, including battery feed, overvoltage protection, ringing generation, and supervisory signaling. It operates in either master or slave mode depending on system configuration, allowing redundant control for high availability. The board interfaces with the switching matrix and the system processor via a high‑speed backplane, converting analog voice and signaling into digital time‑division multiplexed streams.
The FB16401‑A‑I03 revision incorporates improved isolation and surge protection, making it suitable for central offices with varying line conditions. It supports both loop‑start and ground‑start signaling, as well as E&M trunk interfaces for legacy PBX connectivity.
Technical Specifications
Product Type: Analog Master/Slave Control Board
Part Number: FB16401-A-I03
System Compatibility: Alcatel-Lucent GTD-5 (all releases)
Line Support: Up to 32 analog subscriber lines per board (when used as slave)
Signaling Types: Loop-start, ground-start, E&M (Type I/II/III/V)
Voice Encoding: μ-law PCM (G.711) with companding
Control Modes: Master (active) or Slave (standby) via hardware jumper
Power Supply: –48 VDC (derived from system backplane)
Power Consumption: 20 W typical
Operating Temperature: 0°C to 50°C
Dimensions: Standard GTD-5 single-slot form factor
Key Features and Benefits
Redundant master/slave architecture ensures seamless switchover in case of failure.
Integrated ringing generator with selectable frequency (20 Hz or 25 Hz).
On‑board diagnostics for line fault detection and loop‑current measurement.
Software‑programmable gain settings for volume adjustment.
Comprehensive LED indicators for board status, activity, and alarm conditions.
Deployment in GTD‑5 Systems
This control board is typically installed in the line unit shelves of the GTD‑5 switch. In a typical configuration, one master board controls up to four slave boards, each handling a bank of subscriber circuits. The master handles all communication with the central processor and distributes control signals to its slaves. If the master fails, the system automatically promotes a slave to master, maintaining service without interruption.
GTD‑5 switches are still in use in many rural and regional networks, providing reliable POTS services. This board is essential for maintaining analog connectivity, including legacy fax, modem, and alarm lines.
Integration and Maintenance
Installation is straightforward: the board slots into a designated position in the shelf and connects via standard 50‑pin telco connectors. Configuration is performed through the GTD‑5 administrative terminal, where parameters such as line impedance, ringing cadence, and signaling type can be set per port. The board supports online insertion and removal, allowing replacement without powering down the entire shelf.
Routine maintenance includes monitoring LED status and reviewing error logs from the system console. Firmware updates, if required, are loaded via the switch’s maintenance processor.
Reliability and Compliance
The FB16401‑A‑I03 is built to telecom‑grade standards, with a mean time between failures (MTBF) exceeding 200,000 hours. It meets NEBS level 2 requirements for temperature, humidity, and vibration. All components are RoHS compliant, ensuring environmental responsibility.
Conclusion
Alcatel‑Lucent FB16401‑A‑I03 remains a reliable workhorse for analog control in GTD‑5 switching systems. Its master/slave redundancy, comprehensive signaling support, and robust construction ensure continued performance in legacy voice networks.
