Cabletron Systems 3T01-04, Руководство пользователя

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Chapter 2: Connecting to the Network
Page 2-2 Token Ring Switch Module User Guide
2.3 TYPICAL CONFIGURATIONS
Physical connectivity to a Token Ring network is provided by either
shielded twisted pair (STP) or unshielded twisted pair (UTP) cabling that
connects the Token Ring module to a Hub. Each Token Ring switch
module provides only one kind of connector, either four DB9 connectors
for STP cabling or four RJ45 connectors for UTP cabling.
2.4 CONNECTING THE TOKEN RING MODULE
TO A HUB
It is not possible to attach workstations directly to the ATX Token Ring
port. Either an active or a passive Hub must be used. A passive Hub
contains fairly simple electronics (principally relays) which form a
self-healing electrical ring. An active Hub contains more sophisticated
ring-maintenance circuitry and may be manageable.
2.4.1 Unshielded Twisted Pair
When using Unshielded Twisted Pair cabling in a Token Ring
environment, make sure that it conforms to the specifications in Table 2-1
(this assumes patch cables that are no longer than 8 feet or 2.4 meters):
a. To assure compatibility with future LANs, the longest lobe should be limited to
100 meters.
Table 2-1 Unshielded Twisted Pair Cabling Specifications
Data Rate Compatibility Cable Type Longest Lobe
a
4 Mbps
IBM and IEEE
UTP 802.5
Token Ring
EIA/TIA Category 3/4
EIA/TIA Category 5 100 m (328 ft.)
125 m (410 ft.)
16 Mbps
IBM and IEEE
UTP 802.5
Token Ring
EIA/TIA Category 3/4
EIA/TIA Category 5 45 m (147 ft.)
45 m (147 ft.)