News Archive

20. November 2018: New firmware, 43a, for E1/T1 Monitor 3.0 and SDH Monitor 3.0

Release 43a is now available for download from the customer-only area.

6. February 2018: MTP-2 decoding capacity increase

E1/T1 Monitor 3.0 and SDH Monitor 3.0 are now capable of monitoring 240 concurrent MTP-2 channels (previously 96). This increased capacity is available on systems shipped from February 2018 onwards.

5. May 2017: New firmware, 42b, for E1/T1 Monitor 3.0 and SDH Monitor 3.0

Release 42b is now available for download from the customer-only area.

19. January 2017: New firmware, 37b, for E1/T1 Monitor 2.1 and E1/T1 Messenger 2.1

Release 37b is now available for download from the customer-only area.

9. December 2016: LAPD decoding capacity increase

E1/T1 Monitor 3.0 and SDH Monitor 3.0 are now capable of monitoring 400 concurrent LAPD channels (previously 320). This increased capacity is available on systems shipped from February 2016 onwards, using firmware 41c or later.

6. April 2016: New firmware, 37a, for E1/T1 Monitor 2.1 and E1/T1 Messenger 2.1

Release 37a is now available for download from the customer-only area. 37a adds a number of features previously only available on GTH 3.0 hardware.

29. January 2016: Support for 150 Mbit/s ATM in VC-4 and 48 Mbit/s ATM in VC-3 implemented on SDH Monitor 3.0

Firmware is available on request for field testing.

6. November 2014: New firmware, 41b, for SDH Monitor 3.0 and E1/T1 Monitor 3.0

Release 41b is now available for download from the customer-only area. 41b features support for ATM-on-E1 and increased MTP-2 capacity.

24. October 2014: E1/T1 Monitor 2.1 replaced by E1/T1 Monitor 3.0

E1/T1 Monitor 3.0 is now capable of monitoring all protocols supported by 2.1, in many cases with significantly improved price/performance.

The most important new feature in E1/T1 Monitor 3.0 is that 96 channels of MTP-2 can be monitored. SDH Monitor 3.0 MTP-2 capacity has also been increased to 96 channels.

E1/T1 Monitor 2.1 can be still be ordered while supplies last, e.g. for expanding existing sites.

30. January 2014: New firmware, 40a, for SDH Monitor 3.0

Release 40a is now available for download from the customer-only area. 40a includes several new features including optical daisy chaining and 32 kbit/s subrate LAPD.

15. December 2013: Sample code support for Pcap-NG file format

Our sample code for converting captures into a format Wireshark can process now uses the Pcap-NG format by default. The main benefit is that each packet now contains information about which interface it was captured on.

19. December 2012: New hardware for SDH/SONET

The SDH Monitor 3.0 extracts signalling and voice from E1/T1 links carried on SDH/SONET, normally on 155Mbit/s STM-1/OC-3 fiber.

Two hardware options are available, providing either 2 or 6 SFP slots in 1U of rack space. One chassis can thus monitor both directions of 1 or 3 SDH/SONET links.

Datasheet (PDF)

26. October 2012: E1/T1 Monitor 3.0 update

The E1/T1 Monitor 3.0 functionality has been extended. It can now also perform high-capacity frame relay decoding. One probe can decode:

1488 timeslots of frame relay
in up to 96 channels
up to 48 Mbit/s of packets captured in total

A typical application is monitoring the Gb interface.

Datasheet (PDF)

29. March 2012: Software release 36a now available

Release 36a is now available for download from the customer-only area.

22. November 2011: Field reliability

Thousands of Corelatus probes and switching modules are installed in dozens of countries around the world. Several large installations have been operating 24x7 for eight years.

The hardware failure rate in the entire installed base of modules is one module failure per 229 module-years.

26. August 2011: Software release 35a now available

Release 35a is now available for download from the customer-only area.

15. June 2011: Live SS7 captures in Wireshark on Windows

We've updated our example code to allow watching SS7 signalling on an E1/T1 with packets updated live in Wireshark, on Windows. Details here

29. September 2010: New hardware: E1/T1 Monitor 3.0

The E1/T1 Monitor 3.0 is designed to provide low cost monitoring of 3G Iub and GSM Abis links.

A single probe provides 64 E1/T1 receivers in 1U of a 19" rack and can decode up to 768 concurrent channels of ISDN LAPD (for GSM networks) or 32 concurrent channels of ATM (for 3G networks).

Datasheet (PDF)

24. May 2010: Software release 34a now available

Release 34a is now available for download from the customer-only area. 34a includes an improved on-board HTTP server which allows upgrading the GTH firmware images. There are also several improvements to SS5 signalling.

28. April 2010: Example code on github

The GTH API example code (in C, Perl, Python and Erlang) is now on github. (It will also continue being available as .zip files.)

1. February 2010: Expanded C example code

The blog discusses the expanded C example code which now includes a C API for accessing the GTH (and also precompiled .exe files for Win32 machines).

2. November 2009: GTH 2.1 hardware is now shipping

GTH 2.1 hardware is now shipping in volume. GTH 2.1 has the same physical size and external interfaces as GTH 2.0 and the same software API. GTH 2.1 offers increased frame relay monitoring performance.

Double the frame relay performance in narrow channel applications: up to 256 input timeslots (16Mbit/s) in up to 64 separate channels. (GTH 2.0 provided 128 timeslots)
Double the frame relay performance in wide channel applications: up to 496 input timeslots (32 Mbit/s) in up to 32 separate channels. 496 input timeslots corresponds to every timeslot on every E1 at the same time. (GTH 2.0 provided 256 timeslots).

This increased capacity allows one GTH 2.1 module to monitor both directions of eight GSM Gb interfaces.

GTH 2.1 can run software image gth2_system_32a or later.

10. August 2009: blog

Corelatus now has a blog with occasional entries, mainly about the API and SS7 signalling.

28. May 2009: Perl example code

The API section now also has Perl example code.

11. March 2009: Python example code

The API section now has some python example code.

16. February 2009: SS7 sniffer example

The API section has six new examples, three in C and three in Erlang. There's a page about how to capture SS7 signalling with a GTH probe and view the signalling with wireshark.

17. December 2008: Software Release 33a is now available.

Release 33a is now available for download from the customer-only area. 33a includes support for SS5 signalling, fax tone detection and modem tone detection.

The API page has new versions of the API manual and the command/response DTDs to match software release 33a.

5. December 2008: Corelatus makes the Deloitte Fast 500 EMEA list.

The Fast 500 is a list of the top 500 technology companies in Europe, Africa and the Middle East, as measured by growth over the the period 2003-2007.

27. October 2008: Corelatus makes the Deloitte Sweden Technology Fast 50 list.

The Sweden Technology Fast 50 is a list of the top 50 technology companies, as measured by growth over the the period 2003-2007.

6. March 2008: Revised, Expanded and Updated API manual

The API page has new versions of the API manual and the command/response DTDs to match software release 32c.

29. January 2008: Software release 32c now available

Software version gth2_release_32c is now available for customers.

The release notes in the customer-only area contain a full list of changes.

4. January 2008: Field reliability

Thousands of Corelatus probes and switching modules are now installed in dozens of countries around the world. Several large installations have been operating 24x7 for six years.

The hardware failure rate in the entire installed base of modules is one module failure per 170 module-years.

14. May 2007: Frame relay monitoring performance tuned

As of release 31c (available for download from the customer-only area), frame relay performance has been optimised. The largest gain is a doubled capacity to 16Mbit/s (256 timeslots) for the case when there are at most 16 channels, a common configuration for the Gb interface in GSM GPRS networks.

13. February 2007: Software release 31a now available for GTH 1.x

Software version gth1_release_31a brings GTH 1.x hardware up to date with software developments for GTH 2.0 hardware.

The release notes in the customer-only area contain a full list of changes.

8. January 2007: Software release 30a now available for GTH 2.0

Software version gth2_release_30a contains improved support for monitoring ATM in 3G networks (ATM for SS7 HSSL has been supported since release 23a) as well as support for monitoring CAS R2 MFC and CAS R2 line signalling.

The release notes in the customer-only area contain a full list of changes.

16. June 2006: Transition to RoHS-compliant lead-free process complete

All Corelatus products manufactured after 30. June 2006 are fully compliant with the European Union's RoHS ("the restriction of the use of certain hazardous substances in electrical and electronic equipment").

Corelatus Environmental Policy

Corelatus RoHS and WEEE Statement (PDF)

18. May 2006: GTH 2.0 Hardware for Duplex Applications Now Shipping

GTH 2.0 modules suitable for duplex applications (e.g. IVR, Voicemail, Traffic Generation and Gateways) are now shipping in volume. Each GTH 2.0 (duplex) module provides:

8 G.703 transceivers (i.e. capable of connecting to 8 E1 or T1 links).
Non-blocking switching.
120 simultaneous DTMF detectors
120 simultaneous timeslots of message (e.g. voice prompt) generation
120 simultaneous timeslots of message recording

The GTH 2.0 module is a drop-in replacement for GTH 1.1 and 1.0 modules. The software interface and footprint is unchanged.

20. March 2006: GTH 2.0 Hardware Now Shipping

GTH 2.0 modules are now shipping in volume. GTH 2.0 provides twice the amount of monitoring in the same footprint as a GTH 1.1 module. For monitoring applications, each GTH 2.0 module supports:

16 G.703 receivers (i.e. capable of monitoring both directions of 8 E1 or T1 links).
Compatible with G.772 -20dB monitor points as well as nonstandard -30dB monitor points used in some countries.
64 timeslots of SS7-MTP2 or ISDN-LAPD protocol sniffing (i.e. capable of monitoring both directions of 32 MTP-2 links)
4 channels of HSSL (ATM) protocol sniffing
Optional DTMF, Voice and CAS MFC R2 sniffing

A fully equipped 1U chassis fits three GTH 2.0 modules, i.e. up to 48 G.703 receivers and 192 timeslots of SS7 sniffing.

13. September 2005: Software Release 26a

Software version o_release_26a contains support for monitoring ATM AAL2 on ATM-over-E1 links, support for large (up to 30 participants) conferences and support for audio power level detection.

The release notes in the customer-only area contain a full list of changes.

14. September 2004: Field Reliability

Corelatus probes and switching modules are now installed in more than a dozen countries throughout Europe and Asia. The hardware failure rate taken over all installed modules is less than one module failure per 200 module-years.

2. April 2004: ATM-over-E1 monitoring

Software version o_release_23a contains support for monitoring ATM-over-E1 High-speed-signalling links.

The release notes in the customer-only area contain a full list of changes.

3. December 2003: Software Release 22a

Software version o_release_22a is now available. The major new features are a new high-performance binary interface to duplex LAPD and beta support for T1.

The release notes in the customer-only area contain a full list of changes.

12. May 2003: Customer-only area

A new, password-protected customer-only area of the site has been created. It contains

10. December 2002: Software Release 17a

Software version o_release_17a is now available. The major new feature is ISDN LAPD monitoring. This includes:

Forwarding LAPD frames over TCP
LAPD state machine tracking
Counters for I, S, U and ESU frames

The release notes delivered with the software contain a list of changes.

30. September 2002: Software Release 16

Software version o_release_16 is now available. The release notes delivered with the software contain a full list of changes. The API manual has been updated to reflect changes and new features.

24. August 2002: Software Release 15

Software version o_release_15 is now available. The release notes delivered with the software contain a full list of changes. The major new features are:

Frame relay monitoring
TCP streaming

Frame relay monitoring allows extraction of data packets from E1/T1 frame relay links. Each data channel can be made up of an arbitrary arrangement of the timeslots in a PCM link.

TCP streaming allows individual PCM timeslots to be streamed out from GTH systems over a TCP socket. This can be used to forward voice or signalling to a remote system for analysis, encryption or storage.

TCP data can also be streamed in to a GTH system which then transmits it on a PCM timeslot. This can be used to generate on-hold music, long announcements and signalling for load-testing.

The GTH API describes how to use this feature.

3. June 2002: Lab. cabling guide

The FAQ describes how to make several cables which are useful for lab work with GTH systems.