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CHAPTER 3: Installation
3.5 Connecting the Ethernet Ports
The switch has 16 or 32 8-conductor RJ-45 connectors for connection to 10BASE-T
Ethernet or 100BASE-TX Fast Ethernet devices. These RJ-45 connectors are wired
the same as an Ethernet hub, transmitting on pins 3 and 6 and receiving on pins 1
and 2. This allows standard Ethernet devices such as PCs (which transmit on pins 1
and 2 and receive on pins 3 and 6) to be connected to the switch with standard
“straight” network cables.
When connecting one of the switch’s ports directly to an Ethernet hub or network
switch, you’ll need to use a crossover cable, which swaps the transmit and receive
wire pairs as shown in Table 3-1.
Table 3-1. Network cable pin assignments.
Standard Cable
Crossover Cable
Pin 1 to Pin 1
Pin 1 to Pin 3
Pin 2 to Pin 2
Pin 2 to Pin 6
Pin 3 to Pin 3
Pin 3 to Pin 1
Pin 4 to Pin 4
Pin 4 to Pin 4
Pin 5 to Pin 5
Pin 5 to Pin 5
Pin 6 to Pin 6
Pin 6 to Pin 2
Pin 7 to Pin 7
Pin 7 to Pin 7
Pin 8 to Pin 8
Pin 8 to Pin 8
All connections should be made with Category 5 (or better) unshielded
twisted-pair (UTP) cable with a characteristic impedance of 100 ohms.
Summary of Contents for SW595A
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