CTC Union 8309D Manual do Utilizador descarregar pdf (Página 33)

3.8.2 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. 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.

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CTC Union 8309D Manual do Utilizador Página 33