LCOS SX Release

Logo of the LANCOM operating system LCOS SX

New power for your switches

The operating system for LANCOM Switches - the LCOS SX - continuously receives innovative new features and improvements due to our in-house development. This guarantees that your internal networking is always state-of-the-art! Download the right SX version for your device now and benefit from new features and improvements.

Download of the current version

You will find the current LCOS SX release version as well as all active predecessor releases in our download portal. Simply enter your desired product and download the software free of charge!


Feature highlights

LCOS SX 5.20 RU8 bugfixing

For switches of the XS and GS-4500 series

Restoring the extended rights in the CLI tunnel of the LMC

LCOS SX 4.20 RU2 features

For switches of the GS-3200 and GS-3600 series

  • Change of Authorization (CoA) according to RFC 5176 has been implemented
  • Increased the length of the user passwords to 128, the SNMP USM passwords to 128 and the RADIUS secret to 64
  • Increased the standard SSH RSA key length to 4096 bits
  • SSH and SSL algorithms can now be configured
  • The Mac address format for 802.1X Mac-Based Auth is now configurable
  • The SYSLOG server configuration now also allows IPv6 addresses

LCOS SX 4.00 RU12 bugfixing

For switches of the GS-3100 and GS-3500 series

Bugfix of the configuration-impeding occurrence that the switch GS-3510XP remained in the 'Checking availability' status remained

LCOS SX 3.34 RU6 bugfixes

For switches of the GS-1300 and GS-2300 series

  • Fixes a bug that terminated the SSH service and froze the switch by generating an SSH key of the wrong size
  • Fixes a bug caused by the "strict-kex" mode, which prevented the encryption negotiation for remote peers without "strict-kex" support

Further information

Software lifecycle management

With LANCOM Systems you have a manu­facturer at your side who offers unparalleled investment protection. The lifecycle policies from LANCOM also provide full transparency and reliable planning with regard to the firmware updates and product support for your LANCOM infrastructure.

Overview of firmware versions

Keep track of our current operating systems versions of LCOS, LCOS LX, LCOS FX, and LCOS SX with our firmware version overview. It provides a comparison of the different versions and recommended usage, so that you are always well informed.

LANCOM release process

Our aim is the optimal preparation of our operating systems and other software, not only for its use in practice, but also to adapt it to the wishes of our customers. This is why we enter into active dialog with our customers even during the development phase as part of our release procedure.

Note for LCOS SX download

Before upgrading your device to a new firmware it is essential to backup your device’s configuration. Due to extensive features it is not possible to downgrade to a previous firmware without using the backup configuration. Never disconnect the device from power supply while updating the firmware. In this case the device won’t start again.

Your direct line to us

Most questions can be resolved best in direct contact: We look forward to answering your questions and requests by phone or via the contact form.

Inside Sales International Team
+49 (0)2405 49936 122

Feel free to write us