IBM Token Ring specifications define the following cable types:
A shielded cable containing two twisted-pair 22 AWG wires.
A voice/data shielded cable containing two twisted-pair 22 AWG wires for
data with four twisted pairs of 26 AWG wires added outside the shield for
Contains four solid, unshielded twisted-pair 22 or 24 AWG cables. A
media filter is required for use with Token Ring networks.
Fiber-optic (100/140) cable (two strands).
Flexible, shielded twisted-pair patch cables of 26 AWG wire. Distance is
limited to two-thirds that of Type 1. A patch cable connects a PC to
another device or a wall plug.
Shielded twisted-pair 26 AWG cable for use under carpets. Distance
limits are half of Type 1.
Shielded twisted-pair 26 AWG plenum firesafe cable. Distance is limited to
two-thirds that of Type 1.
Although Type 1 shielded cable is the most commonly used cable, Type 3 is also used. Type 3 cannot be used with 16 Mbits/sec Token Ring cards yet.