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REQUIREMENTS/SPECIFICATIONS
Page 2-6
NOTE:
IBM Type 3 - Consists of four Unshielded Twisted Pairs of 24
AWG solid wire for data or voice communication and is typically used to
wire cable runs within the walls of buildings.
In some installations, existing UTP building wiring can be used for
token ring cabling.
DO NOT
connect UTP cabling to any non-token
ring network conductors (telephone, etc.) or ground. If in doubt,
test wiring before using.
WARNING:
Telephone Battery and Ringing voltages, used in UTP
telephone circuits, could present a shock hazard and can damage token
ring equipment when connected to token ring cabling.
MAXIMUM CABLE LENGTH
Lobe Length
is the physical length of the cable connecting a station
to its TCU port at the repeater. Table 2-6 shows the maximum lobe
length, according to ring speed for each repeater. The cable lengths
listed in the table show a total length of the cable that is made up of
a single cable type.
Table 2-5 UTP Voice Grade (IBM Type 3) Specifications
Frequency
Impedance
Attenuation
1 Mhz
100
Ω
±
15%
<26 dB/km (8 dB/1000 ft)
4 Mhz
100
Ω
±
15%
<56 dB/km (16 dB/1000 ft)
10 Mhz
100
Ω
±
15%
<98 dB/km (30 dB/1000 ft)
16 Mhz
100
Ω
±
15%
<131 dB/km (40 dB/1000 ft)