Instruction manual

Network Configuration Decisions
893-839-C 3-3
• The entire Ethernet network consists of only IEEE 802.3 components,
Bay Networks host modules, hubs, and transceivers using only AUI,
10BASE-T, FOIRL, 10BASE-FL, 10BASE5, or 10BASE2 cables.
• Fiber optic link attenuation limits are met, and the number of connectors
used in any link comply with the IEEE 802.3j specifications.
• No link is longer than the IEEE 802.3 maximums listed in T
able 3-1.
Network Path Containing Three Repeaters
In the longest path containing three repeaters, the following requirement
also must be met:
• No transmit-end or receive-end fiber link is longer than 400 meters.
Network Path Containing Four Repeaters
In the longest path containing four repeaters, the following requirements
also must be met:
• No transmit-end or receive-end fiber link is longer than 400 meters.
• No more than three links can be maximum-length coaxial segments.
• No fiber link is longer than 500 meters, or if one or more is longer, the
total of all fiber links does not exceed 2500 meters.
Table 3-1. IEEE 802.3 segment length maximums
Segment type Maximum segment length
10BASE5 (coax) 500 meters
10BASE2 (coax) 185 meters
10BASE-T 100 meters
10BASE-FL 2000 meters
FOIRL 1000 meters
AUI drop 50 meters (2-meter allowance + 48-meter excess)
NOTE: Network paths composed of three, four, or five repeaters must comply
also, as appropriate, with each of the following additional restrictions.
893-839-CBook Page 3 Thursday, December 12, 1996 4:18 PM