Cabletron Systems STH-24 User's Guide download pdf (Page 22)

TCU Specifications

Page 2-7

2-4. Cable routing, connector attenuation, noise and crosstalk can

adversely affect the maximum lobe length.

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)

2.5 TCU 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.

Figure 2-1. TCU pinouts

Table 2-4. STP Maximum Lobe Lengths.

STP

Types

@ 4 Mb/s @ 16 Mb/s

meters (feet) meters (feet)

1 & 2 300 (984) 150 (492)

6 & 9 200 (656) 100 (328)

MALE

RJ45

Cable Shield*

*Cable Shield

not used

with UTP cabling

TX+

RX-

RX+

TX-

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Cabletron Systems STH-24 User's Guide Page 22