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Lexel 'Lync Circuit Tester'

Lync Circuit Tester

This reliability tool tests your Internet connection to a Lexel Lync Online Service data centre and measures the response times, bandwidth, allowed ports, route taken, and overall connection quality with respect to Real Time Media. The results can help you evaluate your network configuration for potential use with the Lexel Lync Online Service or Lexel Lync Private Cloud. This tool does not engage any of the offerings from Lexel Lync Online Service. Instead, it focuses on the quality of your connection to the Lexel Lync Online Service data centre.

Lexel is the premier Lync experts in New Zealand, with key engagements and products:

Key Lync 'Engagements' services include:

Key Lync 'Products' include:

Lync Readiness Assessment Lync Public Cloud ('LLO') for SMB, Govt or Education
Lync Proof of Concepts – On Premise Lync Private Cloud
Lync Proof of Concepts – Private Cloud Lync On-Premise
Lync Proof of Concepts – Public Cloud Lync Support
Lync Workshops Lync Add-ons and End Points
Lync Project 'Rescue'  

Run the Circuit Tester App

Please allow a few moments for the tool to load. Note: Java support is required; click here to download then refresh this page.



This tool helps you understand the quality of the Internet connection between your environment and Lexel Online Services. It does not measure your environment compatibility with Lexel Online Services. The tool performs three tests:

  • Speed:
    This probe measures your actual download and upload speeds, quality of data, and TCP efficiency. It uses TCP/443 for download testing and TCP/443 for upload testing.
  • Route:
    This probe measures your route quality, including packet loss, latency, round trip, and ISP peering points. It uses Internet Control Message Protocol (ICMP).
  • VoIP:
    This probe measures your expected VoIP quality by measuring UDP loss and jitter. It uses UDP/50021 and UDP/50022 to simulate audio streams with G722 codec at 50pps.
  • Firewall:
    This probe tests whether your network firewall is blocking ports necessary for the Lexel Lync Online Service. It tests with outbound connections to TCP/443 for Client Signaling plus AppShare, TCP/5061 for Federation Signaling, UDP/3478 for Media Access, and subsets of UDP/50,000-59,999 for Audio/Video transport.


Disclaimer: Depending on your network and security environment, not all tests may be successful. A test success or failure does not mean that your environment is compatible or incompatible with Lexel Lync Online Service. This performance tool is provided for use “as-is.” The customer bears the risk of using it. Lexel gives no express warranties, guarantees, or conditions.

By activating the tool, you consent to Lexel's collection and use of your IP address, country location and browser type in accordance with the privacy statement.