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REQUIREMENTS/SPECIFICATIONS
MAXIMUM CABLE LENGTH
Two cable lengths are defined for the repeaters, Lobe Length and
Trunk Length.
Lobe Length - The lobe length is the physical length of the cable
connecting a station to its TCU port at the repeater. Table 2-3 shows
the maximum lobe length, according to ring speed for each
repeater. The cable lengths listed in the table a total length of the
cable that is made up of a single cable type.
Trunk Length - The maximum trunk cable length between
repeaters or between a repeater and another active device is equal
to the maximum drive distance (refer to Table 2-4). When the
neighboring token ring device is a passive device, the combined
length of the connecting trunk cable and twice the longest lobe
cable attached to the passive ring segment cannot exceed the
maximum drive distance.
Cable Type
STP
IBM Types 1 & 2
IBM Type 6 & 9
(only for station to
wall jack and patch
panels)
Page 2-4
Table 2-3 Maximum Lobe Length
Maximum Lobe Length
4 Mbit/s
300 meters
(984 feet)
200 meters
(656 feet)
16 Mbit/s
150 meters
(492 feet)
100 meters
(328 feet)
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