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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 Lab cabling guide describes how to make several cables which are useful for lab work with GTH systems.