User manual

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Appendix B
Network Frame Formats
The Ethernet and IEEE 802.3 specifications define slightly different frame
header formats. Both Ethernet and IEEE 802.3 use two 6 byte source and
destination addresses, but the following two byte field is interpreted as a
packet type by Ethernet and as a packet length by IEEE 802.3. Figure 15
shows the Ethernet and IEEE 802.3 frame formats.
The CentreCOM MAC Layer Bridge only inspects the frame source and
destination addresses, so that it will pass packets between Ethernet and
IEEE 802.3 networks. However, hardware attached to the Ethernet
network will net correctly interpret the forwarded IEEE 8()2.3 frame and
vice-versa.
Figure 15: Ethernet and IEEE
802.3 Frame Formats