Network Design Considerations
2-6
TIWAY 1 TI505 NIM User Manual
2.3
LOCAL LINE CABLE INSTALLATION
The following paragraphs describe Local Line characteristics and installation guide-
lines.
2.3.1
Local Line Characteristics
The TIWAY 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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