Cabletron Systems TRMIM 24A TRMIM-24A User Manual page 17

Maximum Lobe Lengths
The lobe length is the physical length of the cable connecting a station
to its TCU port at the TRXI. Table 2-4 shows the maximum lobe
length, according to ring speed. The cable lengths listed in Table 2-4
are total lengths made up of STP cable only.
STP Cable Type
IBM Types 1 & 2
IBM Types 6 & 9 (only
for station to wall jack
and patch panels)
Maximum Trunk Lengths
The maximum trunk cable length between the TRXI and another
active device is equal to the maximum drive distance as shown in
Table 2-5. When the neighboring token ring device is a passive device,
the combined length of twice the longest trunk cable plus the longest
lobe cable attached to the passive ring segment cannot exceed the
Maximum Drive Distance.
Table 2-5. STP Maximum Drive Distance
STP Cable Type
IBM Types 1 & 2
IBM Types 6 & 9
Maximum Number of Stations
When you use STP lobe cabling everywhere on the ring, the TRXI can
support up to 250 stations at ring speeds of either 4 or 16 Mbps.
REQUIREMENTS/SPECIFICATIONS
Table 2-4. STP Maximum Lobe Lengths
Ring Speed
4 Mbps
300 meters
(984 feet)
30 meters
(99 feet)
Ring Speed
4 Mbps
770 meters
(2525 feet)
513 meters
(1683 feet)
16 Mbps
150 meters
(492 feet)
30 meters
(99 feet)
16 Mbps
346 meters
(1138 feet)
230 meters
(755 feet)
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