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50
Coaxial Cable
The 50
coaxial cable, the BNC T-connector, and the 50
10BASE-2 network. Table B-2 lists the specifications of 10BASE2 (ThinNet) RG 58 A/U or RG
58 C/U coaxial cable.
Table B-2.
Specifications of 10BASE2 (ThinNet) RG 58 A/U or RG 58 C/U
coaxial cable
Characteristic
impedance
50 +/-2
The Ethernet specifications limit segments to 30 stations, specify a minimum of 0.5 m between
any two stations, and limit segments to 600 feet (185 m) in length.
AUI Cable
The AUI cable connects the AUI port on the Model EN516 hub to a transceiver. The Ethernet
specifications limit the cable length to 164 ft (50 m). Table B-3 lists the specifications of AUI
cable.
Table B-3.
Specifications of AUI cable
Electrical characteristic
Nominal dc resistance
Pair-to-pair balanced crosstalk
Differential characteristic impedance
Transfer impedance
Attenuation
Timing jitter
Total signal delay
Cabling Specifications
Attenuation
(185 m cable)
<8.5 db @ 10 MHz
<6.0 db @ 5 MHz
AUI cable specifications
<1.75
Minimum 40 dB attenuation from 5 MHz to 10 MHz
78 +/- 5
<3
difference between pairs
<10 m @ 500 KHz
<3 m @ 2 MHz
<3 m @ 10 MHz
<30 m @ 100 MHz
<3 dB from 5 MHz to 10 MHz
<1.0 ns introduced by the cable system
<257 ns
Installation Guide for the Model EN516 Ethernet Hub
terminator, allow a user to construct a
Transfer
impedance
20 m @ 1 MHz
100 m @ 10 MHz
500 m @ 100 MHz
per conductor
at 10 MHz
DC loop
resistance
50 m /meter
B-3
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