Nokia Ethernet bridge adapters 100BASE-T - Manual (Page 6)

Product Overview
6 (14) © Nokia Corporation
DN0610789
Ethernet bridge adapter makes rate adaption and it can be connected to
10BASE-T ET-adapter or DYNANET EIU.
100BASE-T 10BASE-T 10BASE-T
Figure 4. E66210.32 connected
PREAMBLE
SFD
DESTINATION ADDRESS
SOURCE ADDRESS
LENGTH/TYPE
MAC CLIENT DATA
PAD
FRAME CHECK SEQUENCE
Bits within
frame transmitted left to right
Octets within
frame transmitted
top to bottom
7 OCTETS
1 OCTET
6 OCTETS
6 OCTETS
2 OCTETS
46-1500 OCTETS
4 OCTETS
LSB MSB
b 0 b 7
All octets except preamble
and SFD are bridged
transparently over the WAN
Figure 5. MAC frame
The figure above describes the standard Ethernet frame without VLAN tag.
Standard maximum frame length is 1518 bytes. The ET-adapter supports frames
included in 802.1Q VLAN tag. 1522 bytes long frames are forwarded from
LAN to WAN.