Cabletron Systems 42, STHI-44, STH-22, 24 manual TCU Specifications

TCU Specifications

2-4. Cable routing, connector attenuation, noise and crosstalk can adversely affect the maximum lobe length.

Table 2-4. STP Maximum Lobe Lengths.

STP	@ 4 Mb/s		@ 16 Mb/s
Types
	meters	(feet)	meters	(feet)
1 & 2	300	(984)	150	(492)
6 & 9	200	(656)	100	(328)

Mixed STP Cable Types

If cable types are to be mixed in the LAN, compensations must be made for the different cable attenuations. For example, Type 6 & 9 cables can be run for only 2/3 the distance of Type 1: 100 meters of Type 1 ≈ 66 meters of Types 6 or 9)

2.5TCU Specifications

All STH models provide RJ45 TCU connectors for network connections. The STH-22/-24 supports UTP and the STH-42/-44 supports STP. Each TCU port is internally crossed-over to provide connections for straight- through station lobe cabling.

Cable Shield*

TX+

	8
RX-	7
	6
	5	MALE
	4	RJ45
RX+	3
	2
	1

*Cable Shield not used

with UTP cabling

TX-

Cable Shield*

Figure 2-1. TCU pinouts

Page 2-7