Intel PCLA2152B manual Straight-through vs. crossover cables, Determining which cable to use

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Must be a twisted-pair

Must be a twisted-pair

Straight-through vs. crossover cables

Ports on the hub are wired MDI-X (media dependent interface crossover) so you can use a straight-through cable when connecting to a workstation or server (network adapter cards are wired MDI). For direct connection to another MDI-X port (hub and switch ports), you must use a crossover cable.

SCHEMATICS FOR STRAIGHT & CROSSOVER TWISTED-PAIR

CABLE

	Straight-Through		Crossover
Hub	Adapter	Hub	Hub/Switch
1 RX +	1 TX +	1 RX +	1 RX+
2 RX -	2 TX -	2 RX -	2 RX -
3 TX +	3 RX +	3 TX +	3 TX +
6 TX-	6 RX -	6 TX-	6 TX -

NOTE

TPE crossover cables can be used only to daisy-chain hubs running at 10 Mbps.

You can’t use TPE crossover cables to daisy-chain hubs run- ning at 100 Mbps. You must use an Intel Cascade Cable.

Determining which cable to use

The following guidelines are based on the Express 10/100 Stackable Hub, the Intel 10/100 Fast Ethernet Switch, the Intel EtherExpress™ family of network adapters (server or workstation), and the NetportExpress™ family of print servers. These guidelines apply to the majority of hubs and switches and all servers, workstations, or print servers.

For this connection	Use this cable
Hub to switch	Crossover
Hub to hub (10 Mbps only)	Crossover
Hub to server or workstation	Straight-through
Hub to print server	Straight-through

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