Cabletron Systems MICROMMAC-22T, 42T manual Maximum Trunk Lengths, STP Maximum Lobe Lengths

REQUIREMENTS/SPECIFICATIONS

cable length for ring speeds of 4 and 16 Mbps. The cable lengths listed in Table 2-4 refer to total lengths made up of STP cable only

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Table 2-4. STP Maximum Lobe Lengths

STP Cable Type			Ring Speed
		4 Mbps	16 Mbps
IBM Types 1	& 2	300 meters	150 meters
		(984 feet)	(492 feet)
IBM Types 6	& 9 (only for	30 meters	30 meters
station to wall jack and patch		(99 feet)	(99 feet)
panels)

Maximum Trunk Lengths

The maximum trunk cable length between the MicroMMAC-T and other active devices is equal to the maximum drive distance as shown in Table 2-5. For passive devices, 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

If only STP lobe cabling is used throughout the ring, the MicroMMAC-T supports up to 255 ring stations, regardless of ring speed.

2-5