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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
8
7
6
5
4
3
2
1
Cable Shield*
Cable Shield*
*Cable Shield
not used
with UTP cabling
TX+
RX-
RX+
TX-