155
© VeEX Inc. All Rights Reserved.
Ethernet
The Path MTU search follows RFC4821 (Packetization Layer Path MTU Discovery).
l
Step 2Round Trip Time (RTT) Search
:
Measure of the roundtrip time between the TCP segment sent and the acknowledgment received,
the test has to be done in a network that is not congested to obtain the real round trip delay (not
accounting for network buffer delay).
l
Step 3Bottleneck Bandwidth (BB) Search
:
For this step, a Layer2/3 test can be done (RFC2544 or Y.1564) to determine the maximum through-
put rate supported by the network.
l
Step 4Bandwidth Delay Product Calculation
:
Based on RTT and BB results, the BDP is computed to estimate the optimal window size that should
be used for testing (Auto mode). User can also specify fixed window size.
Key Metrics:
l
TCP Bandwidth Delay Product
l
Transfer Time Ratio
l
TCP Efficiency
l
Buffer Delay
TCP Bandwidth Delay Product is the theoretical maximum of data that can be transmitted based on network
delay and throughput rate.
BDP (Bytes) =
Link Bandwidth (bps) x RTT (s)/8
To completely occupy the available bandwidth the Window size must be set to the BDP value.
Summary of Contents for MTX150 Series
Page 1: ...MTX150x User Manual Multi Service Installation Maintenance Test Set P N D07 00 148P Rev B00 ...
Page 11: ...Customer Care 303 Table of Contents VeEX Inc All Rights Reserved 11 ...
Page 171: ...171 VeEX Inc All Rights Reserved Ethernet V FTP Setup Download V FTP Download Results SyncE ...
Page 246: ...Common Functions VeEX Inc All Rights Reserved 246 Bluetooth Devices Bluetooth Scan ...
Page 248: ...Common Functions VeEX Inc All Rights Reserved 248 Bluetooth Devices Bluetooth Scan ...
Page 267: ...267 VeEX Inc All Rights Reserved Common Functions ...