CTC Union FRM220 User Manual download pdf (Page 37)

3.2.8.2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. Q in Q adds yet another 4 bytes, bringing the packet size to 1526 bytes. Any frame size larger than this is

technically called a jumbo frame.

The Loop Back Test Start is accomplished by clicking the “Apply” button.

802.3ah is a slow protocol with a maximum speed of 10 packets per second. The test above takes 10 seconds for 100 packets.

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CTC Union FRM220 User Manual Page 37