Alcatel‑Lucent SM269 LMPQ04KAXX Circuit Pack – Interface Module

The Alcatel‑Lucent SM269, identified by the hardware code LMPQ04KAXX, is a versatile circuit pack designed for use in multiple Alcatel‑Lucent switching and transmission systems. This interface module provides essential signal conditioning, conversion, and protection functions, enabling seamless interconnection between different line interfaces and the system backplane.

Product Overview

The SM269 pack is a printed circuit board assembly that plugs into a designated slot in a host chassis. Its primary role is to adapt the electrical characteristics (voltage, impedance, signaling) of external lines to the internal bus, while also providing overvoltage protection, line monitoring, and diagnostics. The LMPQ04KAXX variant incorporates specific circuitry for high‑speed data lines, making it suitable for TDM, Ethernet, or serial communication interfaces.

This module is commonly used in Alcatel‑Lucent's OmniSwitch and OmniAccess families, as well as in legacy DMS‑100 and GTD‑5 platforms where interface modernization is required. It supports hot‑swap functionality, allowing replacement without powering down the system.

Technical Specifications

• Product Type: Circuit Pack / Interface Module

• Model: SM269

• Hardware Code: LMPQ04KAXX

• Interfaces: 4 x 50‑pin telco connectors (RJ‑21 or similar)

• Signal Types: T1/E1 (2.048/1.544 Mbps), RS‑422, RS‑485, or proprietary levels

• Protection: Overvoltage (TVS), overcurrent (PTC), ESD (15 kV)

• Impedance Matching: 100Ω or 120Ω (programmable)

• Diagnostics: Loopback per port, LED status per line

• Power Supply: –48 VDC and +5 VDC from backplane

• Power Consumption: 12 W typical

• Operating Temperature: 0°C to 50°C

• Dimensions: Standard eurocard (6U x 160 mm)

• Compliance: FCC Part 15, EN 55022, RoHS

Key Features

• Multi‑protocol support for diverse interface standards.

• Integrated isolation to protect the system from line surges.

• Programmable equalization for extended cable lengths.

• Real‑time status LEDs for power, carrier detect, and error.

• Plug‑and‑play configuration via system EEPROM.

Deployment Scenarios

The SM269 is deployed in central office switching racks to interface with external trunks (PRI, CAS) or with remote concentrators. In enterprise environments, it can be used to connect legacy PBX equipment to an IP‑based communication server. It also appears in microwave and optical transmission nodes to bridge TDM and Ethernet domains.

Its robust protection features make it suitable for installations where cable runs may be exposed to lightning or high‑voltage interference.

Installation and Maintenance

Installation involves aligning the card with the slot guides and securing with ejector handles. The system firmware auto‑detects the card and loads appropriate drivers. Replacement is quick and requires no special tools. The board includes self‑test circuitry that runs on power‑up and periodically during operation.

Reliability

MTBF exceeds 150,000 hours, with all active components derated for extended life. The board is conformally coated for resistance to humidity and dust.

Conclusion

The Alcatel‑Lucent SM269 LMPQ04KAXX circuit pack offers a dependable, flexible interface solution for a wide range of telecom platforms. Its combination of protection, diagnostics, and multi‑protocol support ensures trouble‑free connectivity in critical network applications.