234

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

Types

Types

 

Type 8

Type 9

 

Speed

1 and 1A

2 and 2A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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)

Not Supported

Not Supported

Not Supported

 

 

 

See the Note!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

SmartStack STS16-20D/STS16-20R Token Ring Switches Installation and User Guide

Cable and Pin Information

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Cabletron Systems STS16-20D, STS16-20R manual 234, If using any 4 Mbps only adapters or filters, Ring Types Speed