Alcatel Z24 Analog Extension Card (3BA53065AA)

The Alcatel Z24 3BA53065 (also designated 3BA53065AA) is an analog extension interface card used in Alcatel telephony and PBX (Private Branch Exchange) systems. This card provides multiple analog subscriber ports for connecting standard telephones, fax machines, and modems. It is a key component for extending voice services to legacy devices within enterprise and hospitality environments.

Overview

The 3BA53065AA card is part of the Z24 family of line cards, designed for use in Alcatel’s OmniPCX and other compatible PBX chassis. It interfaces with the system’s digital backplane and provides subscriber line interface circuits (SLICs) that handle battery feed, overvoltage protection, ringing, and impedance matching. The card supports both loop‑start and ground‑start signaling, making it versatile for various analog endpoint types. It also includes diagnostic capabilities for line testing and fault detection.

Key Features

• 24 analog subscriber ports per card (typical)

• Supports loop‑start and ground‑start signaling

• Built‑in ringing generator with adjustable frequency and voltage

• Over‑voltage and over‑current protection (ITU‑T K.20)

• Integrated line testing (metallic and transmission tests)

• Hot‑swappable for field replacement

• LED indicators for line status and alarms

• Management via PBX system software

Technical Specifications

• Ports: 24x RJ‑11 or RJ‑45 (depending on connector panel)

• Line Impedance: 600 Ω or 900 Ω (software selectable)

• Ringing Voltage: 40‑90 VAC, 20‑25 Hz

• Loop Current: 20‑40 mA

• Frequency Response: 300‑3400 Hz

• Power Consumption: 15 W typical

• Operating Temperature: 0°C to 45°C

• Dimensions: Standard PBX line card format

Applications

This card is widely used in enterprise PBX systems to connect analog desk phones, fax machines, cordless phones, and legacy equipment. It is also deployed in hospitality environments (hotels, hospitals) where analog extensions are still common.

Integration and Management

The card is managed through the PBX’s software, allowing administrators to configure port parameters, monitor line status, and run diagnostic tests. It supports standard telephony features such as caller ID, call waiting, and message waiting indication.

Installation and Maintenance

Installation involves inserting the card into a designated slot in the PBX chassis and connecting the subscriber cables to the front or rear connector panel. The system automatically recognizes the card. Maintenance includes periodic line testing and cleaning of connectors. The card can be replaced without powering down the chassis.

Conclusion

The Alcatel Z24 3BA53065 analog extension card provides reliable, high‑density analog connectivity for modern PBX systems. Its robust protection, diagnostic features, and ease of integration make it an essential component for enterprises maintaining mixed analog/digital telephony environments.