Lantronix SLC 8000 Advanced Console Manager User Guide - Page 121

6: Basic Parameters Repository and Operations Kept: The SLC can be configured to store probe results on the local SLC storage, or an external USB thumb drive or SD card. The number of operations that can be stored per probe on the local SLC storage is 50 operations; for external USB thumb drive or SD, 200 operations can be stored per probe. Responders: The SLC can act as a responder for probes that require a responder to answer packets that are sent from the SLC (UDP jitter, UDP jitter VoIP, UDP Echo and TCP Connect). The SLC UDP jitter responder can support packet responses for up to 15 UDP jitter or UDP jitter VoIP probes. The UDP Echo and TCP Connect can support packets responses for one UDP Echo or TCP Connect probe. Jitter Probes and Clock Skew: For jitter probes, it is important to have both the sender and responder synchronized to a reliable NTP server. Significant clock skew can greatly affect jitter results, as timestamps are recorded in the sender probe and the responder, and these timestamps are used to measure one-way latency for the packets. At the start of each jitter operation, the clock skew between the sender and the responder will be output to the system log. Compatibility with Cisco Responders: The SLC Performance Monitor sender is compatible with Cisco IP SLA responders (IOS versions 12.2 and 15.0) for jitter probes. The SLC uses a simplified version of the IP SLA v2 (Engine II) protocol to communicate with the Cisco IP SLA responders. This compatibility gives the administrator a large number of devices with which to measure network performance. High Resolution Timers: Performance Monitoring requires that high resolution timers be enabled in order to generate accurate results down to the microsecond. The high resolution timers are disabled by default, and can be enabled on the Maintenance > Firmware & Configurations web page. A reboot is required if the setting is changed. Enabling high resolution timers may affect SLC performance. To manage or view status for a Performance Monitoring probe: 1. Click the Network tab and select the Perf Monitoring option. The following page displays. SLC™ 8000 Advanced Console Manager User Guide 121