Alcatel‑Lucent BNJ118 S1:4 Circuit Board – Interface Module
The Alcatel‑Lucent BNJ118 is a versatile circuit board designated as S1:4, typically used as an interface module in chassis‑based telecom systems. This board provides signal conditioning, electrical isolation, and protection for multiple I/O channels, bridging external cabling to the system backplane. It is commonly deployed in central office switching, transmission, and access equipment.
The BNJ118 features a modular design with plug‑in connectors, enabling easy field replacement. It includes overvoltage/overcurrent protection, impedance matching circuits, and status LEDs for each channel. The board supports both analog and digital signals, with configurations for T1/E1, RS‑422, or general‑purpose digital I/O. Its S1:4 designation indicates a specific slot and channel assignment within the host chassis.
Constructed with high‑quality FR4 material and conformal coating, the board operates reliably in harsh environments. It is fully RoHS compliant and meets NEBS requirements for temperature and humidity.
Technical Specifications
Product Type: Circuit Board / Interface Module
Model: BNJ118 S1:4
Number of Channels: 16 (configurable)
Signal Types: T1/E1, RS‑422, RS‑485, dry contacts
Protection: TVS diodes (1500W), PTC fuses
Isolation: 1500 VAC (channel‑to‑backplane)
LED Indicators: Power, channel status, alarm
Connectors: 2 x 50‑pin telco (RJ‑21) or DB‑25
Power Supply: –48 VDC and +5 VDC from backplane
Power Consumption: 10 W typical
Operating Temperature: –5°C to +55°C
Dimensions: Standard eurocard (6U x 160 mm)
Compliance: NEBS GR‑63, RoHS
Key Features
Multi‑protocol support for diverse interface requirements.
Integrated surge protection for reliable field operation.
Hot‑swappable for maintenance without service interruption.
Diagnostic LEDs for rapid fault identification.
Conformal coating for moisture and dust resistance.
Deployment Scenarios
Used in Alcatel‑Lucent DMS‑100, GTD‑5, and OmniSwitch systems to connect trunk lines, subscriber lines, or alarm inputs. Also deployed in remote terminal cabinets for monitoring environmental sensors.
Maintenance
Replaceable without special tools. Periodic cleaning of connectors recommended.
Conclusion
The BNJ118 S1:4 circuit board provides a flexible, reliable interface solution for telecom infrastructure, ensuring signal integrity and protection across multiple channels.
