Cabletron Systems MICROMMAC-22T, 42T manual Type 3 Media Filters, UTP Maximum Lobe Lengths

REQUIREMENTS/SPECIFICATIONS

Maximum Lobe Lengths

Lobe length is the physical length of the cable connecting a station to its TCU port at the MicroMMAC-T. Table 2-2 lists the maximum lobe cable length for ring speeds of 4 and 16 Mbps. The values listed refer to total lengths made up of UTP cable only.

Table 2-2. UTP Maximum Lobe Lengths

UTP Cable Type	Maximum Lobe Length
	4 Mbps	16 Mbps
Category 3	200 meters	100 meters
	(656 feet)	(328 feet)
Category 4	200 meters	100 meters
	(656 feet)	(328 feet)
Category 5	250 meters	120 meters
	(820 feet)	(394 feet)

Type 3 Media Filters

A Type 3 Media Filter is required when connecting a UTP lobe segment from a MicroMMAC-22T or MicroMMAC-24T to a station supporting STP cabling. Cabletron Systems offers the following Type 3 Media Filters:

•TRMF, RJ45 (UTP) connector to 10-inch DB9 (STP) cable with

LANVIEW

•TRMF-2, RJ45 (UTP) connector to DB9 (STP) connector

Maximum Number of Stations

When UTP lobe cabling is used in any ring segment, the number of ring stations supported by the MicroMMAC-T is limited to 150, regardless of the operating ring speed.

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