Nortel-networks NN43001-563 Instrukcja Użytkownika Pobierz pdf (Strona 144)

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144 ITG engineering guidelines

Figure 30

QoS level with G.723 codec

Obtain QoS measurement tools

PING and Traceroute are standard IP tools that are usually included with

a network host’s TCP/IP stack. A survey of QoS measurement tools and

packages, including commercial ones, can be found in the home page

of the Cooperative Association for Internet Data Analysis (CAIDA) at

ww.caida.org These include delay monitoring tools that include features

like timestamping, plotting, and computation of standard deviation.

Measure end-to-end network delay

The basic tool used in IP networks to measure end-to-end network delay is

the PING program. PING takes a delay sample by sending an ICMP packet

from the host of the PING program to a destination server. PING then waits

for the packet to make a round trip. A sample of PING is as follows:

Richardson3% PING -s santa_clara_itg4 60

PING santa_clara4 (10.3.2.7): 60 data bytes