Specifications

TOKEN RING NETWORK CABLING
4-10
Multimode
There are two types of multimode fiber optic cable: step index and graded
index. Both types are typically used for short-distance communications,
shorter distances than are possible with single-mode fiber optic cable, that
is. Step index fibers have an abrupt change in the index of refraction going
from the core into the cladding, whereas graded index fibers have an
index of refraction that decreases gradually going from the core to the
cladding.
Recommended Maximum Cable Lengths and Stations
Table 4-3 lists recommended trunk (RI/RO) and lobe lengths for fiber
optic cable types used with active Cabletron Systems products at 4 and 16
Mbps. It also lists maximum stations supported.
Table 4-4. Recommended Maximum Cable Lengths and Stations
Single-Mode Multimode
RI/RO Distance, 4 Mbps 10 km 2 km
RI/RO Distance, 16 Mbps 10 km 2 km
Active Device, 16 Mbps
Maximum Stations 250 250
Maximum Lobe Length 10 km 2 km
Active Device, 4 Mbps
Maximum Stations 250 250
Maximum Lobe Length 10 km 2 km