Cabletron Systems BRIM-T6 Unshielded Twisted Pair UTP, Maximum Lobe Length, Maximum Trunk Lengths

MEDIA SPECIFICATIONS AND REQUIREMENTS

Maximum Lobe Length

Lobe length is the physical length of the cable connecting a station to its TCU port. Table B-3 shows maximum lobe length according to ring speed. The length figures are for total lengths of STP cable only.

Maximum Trunk Lengths

The maximum trunk cable length between active devices is equal to the maximum drive distance. When the neighboring device is passive, the Maximum Drive Distance must not exceed the combined length of twice the longest trunk cable plus the longest lobe cable attached to the passive ring segment (see Table B-3).

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Table B-3. STP Maximum Lengths

IBM	Max. Lobe Length		Max. Drive Distance
Type
	4 Mbps	16 Mbps	4 Mbps	16 Mbps
1 & 2	200 meters	100 meters	770 meters	346 meters
	(660 feet)	(300 feet)	(2525 feet)	(1138 feet)
6 & 9	30 meters	30 meters	513 meters	230 meters
	(99 feet)	(99 feet)	(1683 feet)	(755 feet)

NOTE: IBM Types 6 & 9 are to be used only for lobe connections from station to wall jack and patch panels.

B.3 UNSHIELDED TWISTED PAIR (UTP)

TPIM-T2 supports voice-grade UTP cable (as described in EIA/TIA TSB 568) and IBM Type 3 cable.

WARNING: Do not connect UTP cabling to any non-Token Ring network conductors (telephone, etc.) or ground. If in doubt, test wiring before using. Telephone battery and ringing voltages used in UTP telephone circuits may present a shock hazard and may damage Token Ring equipment when connected to token ring cabling.

B-3