Specifications

4-5
TOKEN RING NETWORK CABLING
Attenuation
Maximum attenuation for specific cable types at 4 and 16 megahertz is
shown by Table 4-2. The attenuation values include the attenuation of the
cables, connectors, and patch panels.
Table 4-1. Recommended Maximum Cable Lengths And Station
STP Type 1/2
RI/RO Distance, 4 Mbps 770 m
RI/RO Distance, 16 Mbps 346 m
Active Device, 16 Mbps
Maximum Stations 250
Maximum Lobe Length 150 m
Passive Device, 16 Mbps
Maximum Stations 250
Maximum Lobe Length 100 m
Active Device, 4 Mbps
Maximum Stations 250
Maximum Lobe Length 300 m
Passive Device, 4 Mbps
Maximum Stations 250
Maximum Lobe Length
200 m
Table 4-2. Maximum Cable Attenuation
4.0 Mhz 16.0 Mhz
STP (IBM Types 1 & 2)
22 dB/km 45 dB/km
STP (IBM Types 6 & 9)
33 dB/km 66 dB/km