Siemens 39ACM28AEN | Digital Line Circuit Module | 24 Digital Ports | HiPath 4000 / OpenScape 4000

Product Description:

The Siemens 39ACM28AEN (often known by its SLMO24 or SLMO family name) is a high-density Digital Line Circuit (DLC) module specifically designed for HiPath 4000 and OpenScape 4000 communication servers. This module offers 24 digital channels, allowing seamless integration of Siemens Optiset and Optipoint digital telephones with the PABX (Private Automatic Branch Exchange) system.

At the heart of this module is its use of the UP0/E digital interface, which supports efficient communication between the system's internal pulse-code modulation (PCM) highway and the digital signaling used by Siemens' advanced telephones. The 39ACM28AEN serves as a reliable "workhorse" in enterprise telephony, enabling voice and data to travel over a single pair of copper wires, effectively simplifying infrastructure while maintaining performance.

The EN suffix in the model indicates that this version is optimized for international or regional hardware revisions, supporting global telecommunications standards for consistent, reliable performance.

Key Features and Functions:

1. UP0/E Digital Interface:
   The UP0/E interface employed by the 39ACM28AEN supports "Master-Slave" configurations, enabling two digital phones to be connected to a single port using a T-Adapter. This significantly enhances wiring efficiency, making the system ideal for large-scale deployments.

2. Power over Line:
   This module supplies DC power to connected digital devices, such as displays and internal processors of the phones, eliminating the need for local power adapters at each desk. As long as the central PABX system has a UPS, the phones will continue to function even during power failures.

3. Integrated Diagnostics for Proactive Monitoring:
   The 39ACM28AEN module offers advanced line-monitoring capabilities, allowing administrators to remotely detect:

• Short Circuits: Identifying wiring faults for faster troubleshooting.

• Terminal Status: Verifying the operational status of connected phones.

• Transmission Quality: Monitoring bit error rates on the digital loop for performance assurance.

4. Hot-Swap Capability:
   Designed for high availability, the 39ACM28AEN can be hot-swapped. The module can be inserted or removed without taking the system offline, ensuring minimal disruption. Once inserted, the system's central processor automatically uploads the correct firmware to the module, ensuring version compatibility.

Technical Specifications:

Installation and Connection Details:

• Mounting Location: The 39ACM28AEN is installed in a peripheral shelf (AP 3700 / IPDA) within the HiPath 4000 or OpenScape 4000 system.

• Front-End Connection: The module connects to the backplane using the SIVAPAC connector.

• MDF Wiring: The module’s 24 ports are typically connected to a Main Distribution Frame (MDF) using shielded 25-pair or 50-pair cables, often with Champ or RJ21 connectors.

• Terminal Support: Compatible with Siemens Optiset E, Optipoint 500, and OpenStage T (Digital) series handsets, providing flexibility in device compatibility.

Applications:

The Siemens 39ACM28AEN is designed to support enterprises and large organizations that require a high-density, reliable, and scalable solution for integrating digital handsets into their communication infrastructure. It is widely used in:

• Corporate Offices: Providing robust and scalable digital telephony solutions.

• Hospitals: Connecting numerous digital phones across large facilities.

• Large Campus Environments: Offering high-density telephone systems with minimal wiring.

Frequently Asked Questions (FAQ):

Q: What is the 39ACM28AEN used for?
A: The 39ACM28AEN is a Digital Line Circuit Module that enables integration of Siemens digital telephones (Optiset, Optipoint, OpenStage) into the HiPath 4000 or OpenScape 4000 PABX systems. It allows for high-density digital channels over a single pair of copper wires.

Q: Can the 39ACM28AEN be installed without shutting down the system?
A: Yes, the 39ACM28AEN is hot-swappable, meaning it can be installed or removed without interrupting system operation, ensuring continuous service in critical environments.

Q: Does the 39ACM28AEN support remote diagnostics?
A: Yes, it includes advanced line-monitoring features such as detecting short circuits, checking terminal status, and monitoring transmission quality for proactive system maintenance.