LTE Modem Expansion Module

Maximum reliability: Didactum LTE modem for server room and corporate monitoring

The Didactum LTE modem expansion module is a key component for reliable monitoring of server rooms and critical business areas. With support for sending and receiving SMS via 2G and 3G networks, as well as providing Ethernet connectivity over LTE (4G), this LTE modem offers a flexible and fail-safe communication solution for modern monitoring systems. In environments where the network connection cannot always be guaranteed, the LTE modem provides the necessary redundancy and security.

This module is the version optimized for Europe. It covers the LTE and GSM frequency bands commonly used in European mobile networks and is supplied by Didactum as standard including the matching additional antenna — no separate antenna purchase is required.

The current model can be easily identified visually: it has exactly one antenna connector. The older predecessor module (VT740) still had two antennas — with this module, the single supplied additional antenna is sufficient for full functionality.

Monitoring server rooms with LTE modem

In server rooms, continuous monitoring of all relevant environmental parameters and systems is essential to prevent outages and damage. The Didactum monitoring systems 100T, 300T, 500T, and 550T can be equipped with the LTE modem so that alarm messages and status information are reliably transmitted even if the LAN connection fails.

When a network outage occurs, the LTE modem automatically switches to LTE 4G and thus maintains the Ethernet connection. Through the modem, alarm contacts and sensors in the server room can be monitored around the clock. In the event of temperature deviations, humidity, smoke development, or unauthorized access, the system immediately sends notifications via SMS or SNMP to the responsible technicians and administrators.

Module layout at a glance

The slot board has three key controls that are relevant for installation and operation.

Installing the LTE modem

The module can be installed while the system is running — it is not necessary to shut down the monitoring system. After powering on, it may take up to three minutes for the mobile provider information to update.

1. Loosen the M3 screw on the LTE metal cover of the central unit
2. Cut out the metal inserts with side cutters and dispose of them
3. Insert the LTE slot board into the opening so that it slides into the guide rails and locks into the socket
4. Reinsert the metal cover and secure it with the M3 screw
5. Screw the supplied LTE antenna into the antenna connector
6. Insert the Micro-SIM card into the SIM card slot (slot with ejector mechanism)
7. Switch on or leave the monitoring system running — the mobile provider information will be updated automatically within up to 3 minutes

What is the IMEI number and where can I find it?

The IMEI number (International Mobile Equipment Identity) is a unique identifier assigned to every LTE modem and other mobile devices. It uniquely identifies the modem on the mobile network and allows mobile providers to check the device type and network compatibility.

The IMEI number is shown in the Didactum web interface only after a SIM card has been inserted into the modem and the information has been updated (this can take up to 5 minutes).

Frequency bands of the EU version

This LTE modem is specifically optimized for Europe and covers the mobile bands commonly used there. Before use, it is always advisable to check the frequency bands supported by your local mobile provider.

This band coverage is reliable for use in European mobile networks. For locations outside Europe with different frequency bands (for example North America, Asia, or Australia), the manufacturer’s international modem version is recommended, but this is not carried by Didactum.

Monitoring critical business areas

Not only in the server room, but also in other critical business areas such as technical rooms, production environments, warehouses, or power centers, reliable communication plays a decisive role. The Didactum LTE modem can be used wherever a stable network connection cannot be guaranteed at all times, such as in remote branches, field offices, or temporary sites.

Another application example is the monitoring of UPS systems, emergency generators, or air conditioning systems. Here too, the LTE modem can serve as a communication bridge and send immediate notifications in the event of faults. The ability to alert up to ten different phone numbers via SMS increases response speed and ensures that the right contact person is informed.

• Monitoring of server rooms and data centers with automatic alerting when the network connection fails
• Ensuring communication in technical rooms, production environments, and power centers
• Remote monitoring of branches and field offices without a fixed internet connection
• Monitoring and control of UPS systems, emergency generators, and air conditioning systems
• Use as a backup solution for critical networks in hospitals, public authorities, or industrial companies
• Remote maintenance of connected devices via the integrated remote reboot function

Setup via the web interface

Setup is carried out via the user-friendly web interface, where all settings for the mobile connection, SMS notifications, and network redundancy can be configured. Integration into existing monitoring systems such as the 100T, 300T, 500T, or 550T is straightforward and requires no special prior knowledge.

After installation, the LTE modem can be used immediately to secure the monitoring system’s communication. Thanks to support for DHCP and numerous protocols such as SNMP, SMTP, or Syslog, the LTE modem integrates seamlessly into the existing IT landscape. In addition, the modem can be controlled via AT commands, enabling deeper configuration for experienced users.

What is included in the box

Please check the scope of delivery upon receipt for completeness and report any missing or damaged parts to your supplier immediately.

• LTE modem (slot board)1 piece
• LTE additional antenna (SMA)1 piece
• Metal cover for the expansion slot1 piece
• M3 fastening screw1 piece

A SIM card is not included and must be obtained separately from a mobile provider. A Micro-SIM card is required.

Why this LTE modem is the right choice

Frequently asked questions