Surveyor User's Guide

10-19
Expert Features
Application Response Time
10
Working with Analyzer Devices
For THGm or NDIS resources, expert views present expert information on capture
files, capture buffers, or in real-time monitor mode.
An analyzer card with a hardware capture buffer is typically used for expert
analysis. Use of an NDIS or Portable Surveyor 10/100 Ethernet Analyzer Card
severely limits the number of packets that can be analyzed and the effectiveness of
network diagnostics.
Application Response Time
The response time for various applications is measured in milliseconds (ms). A
threshold can be set in the Application Response Time Alarms for all supported
applications. Supported applications are:
• DNS
•FTP
• Gopher
• HTTP
•NFS
• NNTP
•POP
•SMTP
• TELNET
From Detail View, press the Application Response Time
button to see applica-
tion response times. See Chapter 6 on Views for more information on the Applica-
tion Response Time table.
To calculate application response time, Surveyor causes a stimulus packet to be
trasmitted so the application layer round trip time can be assessed. However, the
packet cannot be sent if the analyzer device used by Surveyor is connected through
a tap device.The application response time will only work if the transmit port of the
analyzer is directly connected to a switch port or device.