CTC Union FTH4-1000MS, User Manual

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The unidirectional support indicates whether or not the device supports the transmission of OAMPDUs on links that operate in
unidirectional mode. Use the radio button to enable Unidirection Support if it is capable of sending OAMPDUs when the receive path is non-
operational.
3.7.2 Loop Back Test
The loop back test is a non-intrusive test which uses OAM packets and will not affect normal transmissions. The number of OAM frames
used (the number of times the loop back is done) is set by the Send Packet Number . The default is 1 packet.
The Packet Length (Not including CRC) controls the packet size of the OAM frames used for loop back testing. The default is 60 bytes.
The CRC of Ethernet packets uses 4 bytes. Valid Ethernet packets range in size from 64 bytes to 1518 bytes. VLAN tag adds another 4 bytes
for a maximum size of 1522 bytes. Any frame size larger than this is technically called a jumbo frame and is not IEEE802.3 compliant.
The Loop Back Test Start
is accomplished by clicking the “Apply” button.
802.3ah is a slow protocol with a maximum throughput of 10 packets per second. The test above takes about 10 seconds for 100 packets.