StarTech.com ET91000LCOAM Full User Manual
Page 17
Instruction Manual
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Errfrmsec_Win (Error Frame Seconds Summary Window) – (Default: 10) This
window of time can be adjusted from 10 to 900 seconds. This is the "Window" used to
gather error frame seconds (the number of 1-second intervals with at least one frame
error).
Errfrmsec_Thr (Error Frame Seconds Summary Threshold) - This threshold count
can be set from 5 up to 2 x 1016. This count in conjunction with the frame seconds
window, will determine if the Error Frame Seconds Summary event is reported via
OAM.
Loopback Test
The loop back test is a non-intrusive test which uses OAM packets and will not affect
normal transmissions.
Send Packet Number – (Default: 1) The number of OAM frames used (the number of
times the loop back is done).
Packet Length (Not including CRC) – (Default: 60 bytes) Controls the packet size of
the OAM frames used for loop back testing. The CRC of Ethernet packets uses 4 bytes.
Valid Ethernet packets range in size from 64 - 1518 bytes. VLAN tag adds another 4
bytes and Q in Q adds yet another 4 bytes, bringing the packet size to a maximum of
1526 bytes. Any frame size larger than this is technically called a jumbo frame.
802.3ah Status
The Global Config fields display the state of OAM (if Enabled). We can also see the
MAC addresses of the local and remote units in the OAM manageable pair.
The Flags Field list the results of individual events based on the results of OAM
protocol data units (OAMPDUs).
Lastly, when two OAM devices start negotiation, there is Discovery Information
passed between them. The results are shown here.