3Com PathBuilder S200 Series Owner's Manual page 107

Proper LT Figure 52 shows a Token Ring LAN properly configured for Local Termination.
configuration
Figure 52. Example of Proper LT Configuration
Local Termination running on PathBuilder S200 series switch bridges 1, 2, and 3 at
the edge points of the network provide a simple solution to congestion and
bandwidth problems across the entire network.
LLC Protocol
LLC is a link layer protocol used in IBM environments and defined in the IEEE802.2
LAN model. Its function is to establish, maintain, and terminate the logical link
between adjacent stations in a network.
LLC Frame
There are three types of LLC operations:
Description
LLC2 Frame
Logical Link Control 2 (LLC2) is a connection-oriented, acknowledged protocol.
Description
LLC2 requires a connection setup between two LAN devices. LLC2 is based on the
HDLC protocol and is used to transport SNA traffic, as well as other protocols.
Bridging
T0008-16F
SNA
1
FEP
LLC2
Keepalives/Acks
Keepalives/Acks
Type Name
Type 1 LLC1
Type 2 LLC2
Type 3 LLC3
LLC2
Keepalives/Acks
2
3
LLC2
CC
Description
Unacknowledged, connectionless services
Connection-oriented services
Acknowledged, connectionless services
LLC2 Local Termination
CC
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