22. July 2025: Announcing the new 4.0 hardware generation
Corelatus is now field testing our new generation of hardware to take SDH/Sonet and E1/T1 monitoring into the next decade.
SDH Monitor 4.0 is a drop-in replacement for SDH Monitor 3.0. It features up to eight SFP sockets per chassis (up from six) and accepts both STM-1/OC-3 and STM-4/OC-12 inputs.

E1/T1 Monitor 4.0 is a drop-in replacement for E1/T1 Monitor 3.0.
We have planned the transition from 3.0 to 4.0 to be as smooth as the transition from 2.1 to 3.0 was. The units physically fit in the same spaces as the existing generation, the interfaces have the same pin-outs and the API is backwards compatible. We will continue supplying 3.0 units to allow customers to choose their own timetable for when (or if) they want to migrate.
25. March 2024: Corelatus has moved
After 20+ years on Tegnérgatan, we have moved to a larger lab in Nacka Strand.
4. September 2023: E1/T1 -20 dB protected monitor points available
Corelatus now sells protected monitor points for connecting to 120 ohm E1 or 100 ohm T1 lines.
24. February 2023: New firmware, 45a, for SDH Monitor 3.0
Release 45a is now available for download from the customer-only area.
11. June 2020: New firmware, 44c, for SDH Monitor 3.0
Release 44c is now available for download from the customer-only area. New features include beta support for J1 (Japan) and V.110.
14. May 2020: New firmware, 44b, for E1/T1 Monitor 3.0
Release 44b is now available for download from the customer-only area. New features include beta support for J1 (Japan) and V.110.
7. February 2019: E1/T1 Messenger 2.1 replaced by E1/T1 Messenger 3.0
E1/T1 Messenger 3.0 is now available. It provides all of the features Messenger 2.1 provided, with higher capacities.