
Network Design Considerations
2-6
TIWAY 1 TI505 NIM User Manual
2.3 LOCAL
LINE CABLE INST
ALLATION
The following paragraphs describe Local Line characteristics and installation guide-
lines.
2.3.1 Local
Line Characteristics
The
TIW
A
Y I Local Line is a physical
signaling technique (baseband, differential current
drive)
which operates over shielded, twisted-pair cabling. The Local Line cable may be
up
to 25,000 feet long, depending on loading and baud rate selection. It uses tap housings
to simplify the addition of network connections. The Local Line is designed to operate
with
shielded, twisted-pair cable which has a characteristic impedance of 124 ohms.
Taps
and 9-pin connectors are supplied with the Local Line, but extras may be
necessary
for
cable splicing. Suggested cable routing procedures are
provided later in this chapter
.
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