The ARGUS 125 has test routines for E1 / 2Mbit and PRI accesses including monitoring of the D channel on PRI accesses. The 16 MB of internal flash memory enables the tester to record and save the monitoring data even without a connection to a computer. As an option, a V5.x monitor is available for the ARGUS 125: This monitor can be used to record the V5.1 or V5.2 protocol, which can then be decoded in detail with the WINanalyse software.