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ITG Engineering Guidelines
553-3001-202 Standard 1.00 April 2000
Measure intranet QoS
You can measure end-to-end delay and error characteristics of the current
state of the intranet. These measurements help you set acceptable QoS
standards when using the corporate intranet to transmit voice services.
Measure end-to-end network delay
The basic tool used in IP networks to measure end-to-end network delay is
the program. takes a delay sample by sending an ICMP packet
from the host of the program to a destination server. then waits
for the packet to make a round trip. The output of is like the following:
The time field displays the round trip time (rtt).
So that the delay sample results match what the ITG node can experience, the
host must be on a working LAN segment attached to the router
intended to support the ITG node. The selection of destination host is just as
important, following these same guidelines for the source host.
The size of the probe packets must be set to 60 bytes to approximate
the size of probe packets sent by the ITG that are used in determining when
new calls need to fall back.