Based on the LayGO Data Line Monitor (DLM) API, Advanced Relay has developed a flexible system to monitor, decode and analyze traffic on a synchronous line. The Introduction to the LayGO DLM API Manual gives necessary background to this manual.

There are two ways to tap a line for monitoring:

  1. If you are a developer using the LayGO Toolkit, you can use a tap-enabled version of the LayGO stack.
  2. If you need to monitor the link between 2 systems, neither of which is running a LayGO application, you can use a LayGO PXS configured as hardware tap. This option is described in the LayGO DLM section of the LayGO PXS - Protocol eXchange Server Manual.

In either case, you need a LayGO DLM server to receive monitoring events and to pass them to a monitor program. However, when using the PXS, an embedded version of the DLM server will normally run inside the PXS.

You will also need a monitor program to display the communication events and/or to save the data to a capture file for later analysis.

This manual describes various DLM Servers and Monitors. There are also several utility programs to help use the system.