Albedo xGenius - Performance Assessment with the RFC 6349

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User Guide
180
7.3.Performance Assessment with the RFC 6349
Both the RFC 2544 and the eSAM tests are Ethernet and IP tests that provide the same
result regardless of the application. They generate fixed frame rates and verify the
ability of the network to transmit this traffic with a low impairment level.
The RFC 2544 and eSAM approach is good for low latency applications (video, voice)
based on the User Datagram Protocol (UDP) but it has proven to be insufficient for data
transfer applications (web, file transfer, e-mail) which are highly sensitive to
transmission errors and they are often based on the Transmission Control Protocol
(TCP). TCP is more complex than UCP. Unlike UDP, TCP is connection oriented,
Figure 7.12: (a) No window is used: The transmitter has to wait for the acknowledge
message to resume transmission. (b) TCP window mechanism: Continuous
transmission can be achieved.
Data
TCP transmitter
xGenius
xGenius
TCP receiver
Data
Ack
Ack
(a)
(b)
Data
TCP transmitter
xGenius
xGenius
TCP receiver
Data
Ack
Ack
Data
Ack
Ack
Ack
Ack