Cabletron Systems STS16-20R - Manual (Page 248)

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SmartStack STS16-20D/STS16-20R Token Ring Switches Installation and User Guide Cable and Pin Information
if using any 4 Mbps only adapters or filters).
Cable Length and Lobe Wiring Rules
for Dedicated-Media LAN Segments
The Cabletron Systems Token Ring network dedicated-media (full-duplex)
connections support only one attached entity (workstation or switch) per
connection. In a Token Ring network, the section of cable that attaches a device to
an access unit is called a lobe.
The tables in this section specify the maximum supported lobe lengths for the types
of cables listed. An additional 10 m (33 ft) per lobe length is allowed to
accommodate patch cables, unless otherwise specified.
Ring
Speed
Types
1 and 1A
Types
2 and 2A
Type 8 Type 9
4 Mbps 750 m (2460 ft) 750 m (2460 ft) 376 m (1234 ft) 500 m (1640 ft)
16 Mbps 430 m (1410 ft) 430 m (1410 ft) 215 m (705 ft) 295 m (968 ft)
100 Mbps 90 m (295 ft)
See the Note!
Not Supported Not Supported Not Supported
➽
Note : An additional 10 m (33 ft) UTP 100 Ohm CAT.5 lobe length and a
maximum of two UTP/STP converters without impedance transformation
is allowed to accommodate connection to the STP cabling. The UTP/STP
converter must be specified for 100 MHz operation.
Table 19. Lobe Length for 150 Ohm Shielded Media
Ring Speed 100 Ohm Type 3 100 Ohm Category 3
4 Mbps 100 m (328 ft) 250 m (820 ft)
16 Mbps Not Supported 100 m (328 ft)
100 Mbps Not Supported Not Supported
Table 20. Lobe Lengths for 100 Ohm Shielded or Unshielded Cable