Quick Start Manual

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