Alcatel TN 2523 1:1 CDN III Module – MRPQAE3
The Alcatel TN 2523 is a high‑density digital network interface module, designated as 1:1 CDN III and identified by hardware code MRPQAE3. This card is designed for Alcatel’s family of digital switching systems, providing call distribution, trunk aggregation, and signalling conversion for TDM‑based voice networks. It supports 1:1 redundancy, ensuring high availability for carrier‑grade telephony applications.
The CDN III (Call Distribution Network III) architecture integrates advanced digital signal processing (DSP) resources for echo cancellation, tone detection, and conferencing. The module connects to external E1/T1 trunks via standard RJ‑45 or BNC interfaces, and to the switching matrix via a high‑speed backplane bus. It handles up to 32 E1/T1 ports (depending on configuration), providing dense trunking capability for central offices and large enterprise PBX systems.
The MRPQAE3 variant includes enhanced protection against lightning surges and improved clock recovery for long‑haul T1/E1 spans. It also supports both ISDN PRI and CAS signalling, making it versatile for global deployments.
Technical Specifications
Product Type: Digital Network Interface Module
Model: TN 2523 1:1 CDN III
Hardware Code: MRPQAE3
Port Density: 32 x E1 (2.048 Mbps) or 32 x T1 (1.544 Mbps) – software configurable
Interface Connectors: 4 x 50‑pin telco (RJ‑21) or BNC (depending on variant)
Line Coding: HDB3 (E1) or B8ZS (T1)
Framing: PCM‑30/31 (E1) or SF/ESF (T1)
Signalling: ISDN PRI (Q.931), CAS (MFC/R2, loop‑start, ground‑start)
Voice Processing: Echo cancellation (G.168), tone detection/generation
Redundancy: 1:1 hot‑standby with automatic switchover
Power Supply: –48 VDC from backplane
Power Consumption: 30 W typical
Operating Temperature: 0°C to 50°C
Dimensions: Standard eurocard (6U x 160 mm)
Compliance: ITU‑T G.703, G.704, Telcordia GR‑499, RoHS
Key Features
High‑density trunk interface reduces chassis space per port.
1:1 redundancy ensures carrier‑grade availability.
Multi‑protocol signalling for global compatibility.
Integrated DSP resources for voice enhancement.
Remote diagnostic and loopback capabilities.
Deployment Scenarios
Used in central office switches to connect to the PSTN, to interconnect with other PBX systems, or to provide ISDN PRI services to enterprise customers. Also deployed in media gateways for TDM‑to‑VoIP interworking.
Management
Managed via the host switch’s maintenance terminal (CLI or TL1). Provides detailed PM data per trunk.
Reliability
MTBF > 160,000 hours; redundant power and protection paths.
Conclusion
The Alcatel TN 2523 1:1 CDN III module offers a robust, high‑capacity solution for digital trunk connectivity, combining redundancy, signalling flexibility, and integrated voice processing.
