Ethernet Lan - 3Com PathBuilder S200 Series Owner's Manual

Bridging Features and Capabilities

Ethernet LAN

What Is It?
PathBuilder S200
Series Switch
Support for
Ethernet
Example of Basic
Ethernet Frame
Format
802.3 MAC Frame
Format
6
Ethernet is a common implementation of LAN topology wherein stations are
connected using a bus topology. Stations access the Ethernet using Carrier Sense
with Multiple Access and Collision Detection (CSMA/CD).
PathBuilder S200 series switch Ethernet functionality complies with the IEEE 802.3
specifications and provides Transparent Bridging to transport many different
protocols over the Wide Area Network (WAN) to remote destinations. Supported
protocols include:
• Novell Netware
• DECnet
• Banyan Vines
Figure 3 shows the basic frame formats for Ethernet frames supported by
PathBuilder S200 series switches.
Ethernet Frame Format
Preamble Destination Source Type
8 6
64-1518
Figure 3. Frame Format for Ethernet Frames
Figure 4 shows the supported 802.3 Ethernet MAC Frame format.
802.3 MAC Frame Format
Preamble SFD Destination Source Len Data Unit Pad FCS
DSAP SSAP Control Higher Layer Information
1 1
802.3.LLC
Figure 4. 802.3 Ethernet MAC Frame Format Example
Data
6 2 45-1500
1 or 2
42-1497
FCS
Octets
4
Octets
Bridging