Cabletron Systems STS16-20R User Manual

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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

➽

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

Table 20. Lobe Lengths for 100 Ohm Shielded or Unshielded Cable