Cabletron Systems TRXI-22, TRXI-42, TRXI-24 STP Cable Type Ring Speed Mbps, Maximum Trunk Lengths

REQUIREMENTS/SPECIFICATIONS

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.

Table 2-4. STP Maximum Lobe Lengths

STP Cable Type		Ring Speed
		4 Mbps	16 Mbps
IBM Types 1	& 2	200 meters	100 meters
		(660 feet)	(330 feet)
IBM Types 6	& 9 (only	30 meters	30 meters
for station to wall jack		(99 feet)	(99 feet)
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	Ring Speed
	4 Mbps	16 Mbps
IBM Types 1 & 2	770 meters	346 meters
	(2525 feet)	(1138 feet)
IBM Types 6 & 9	513 meters	230 meters
	(1683 feet)	(755 feet)

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.

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