B-2
SwitchMaster™/SwitchMasterFL™
D. 10BaseT Cable Specifications
The following describes the specifications when twisted pair is used. Either shielded or
unshielded twisted pair can be used. The physical characteristics must meet or exceed
those set forth by the IEEE 802.3 10BaseT specifications. Generally, Level 3 wire or bet-
ter is recommended. The cable must have a minimum of 2 pairs of twisted 26 to 22
AWG wire.
Note: Do not use flat or “silver satin” wire.
Gauge
26 to 22 AWG
Attenuation
Less than 11.5 dB, 5 - 10 MHz
Differential Characteristic
85 - 110
Ω
@ 10 MHz Impedance
Maximum Distance
100 Meters (330 Feet)
E. RJ-45 Pin Specifications
Individual wires that make up a straight through twisted pair modular cable are shown
below.
Each pair has designated pin connections on an RJ-45 modular connector. There are
only two active pairs in a 10BaseT network, pins 1 & 2 and 3 & 6. Use only dedicated
wire pairs (such as blue/white, white/blue, orange/white, white/orange, etc.).
Hub
Terminal
RJ-45 Male
RJ-45 Male
1 - - - - - - - - - - - - - - - - - - - - - - - - 1
2 - - - - - - - - - - - - - - - - - - - - - - - - 2
3 - - - - - - - - - - - - - - - - - - - - - - - - 3
6 - - - - - - - - - - - - - - - - - - - - - - - - 6
The following are the pins for a crossover cable to cascade hubs or connect transceiver
to transceiver.
Hub to
Hub
Terminal
to
Terminal
RJ-45 Male
RJ-45 Male
1 - - - - - - - - - - - - - - - - - - - - - - - 3
2 - - - - - - - - - - - - - - - - - - - - - - - 6
3 - - - - - - - - - - - - - - - - - - - - - - - 1
6 - - - - - - - - - - - - - - - - - - - - - - - 2
F. 10Base2 Cable Specifications
The IEEE 802.3 standard for a thin coax segment is listed below:
• Maximum distance of 185 meters (610 feet) at 50 ohms.