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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Contents Intel Express 10/100 Stackable Hub First edition April 662204-001 This guide covers the following productsAll ports operate at the same speed Check the LEDs for links. You’re doneNext steps Optional Connecting hubs running at 10 Mbps Connecting hubs running at 100 MbpsContents Connecting 100BASE-TX devices Connecting 10BASE-T devicesConnection Guidelines Mixed 10 Mbps and 100 Mbps environment Example ConfigurationsBridging with the Express 10/100 Fast Ethernet Switch Bridging with the Express 10/100 Downlink Mbps-only environmentExtending the 100 Mbps network topology Attaching hubs to a switch Extending the 10 Mbps network topologyDaisy-chaining hubs 10 Mbps only Status Meaning Understanding LEDsPort LEDs Partitioned ports100BASE-TX Unit LEDs100BASE-FX requirements Cabling Requirements100BASE-TX requirements 10BASE-T requirementsStraight-through vs. crossover cables Determining which cable to useFor this connection Use this cable Link, but amber LED above port is blinking erratically TroubleshootingNo link green LED is off No link, amber LED above port is blinking slowlyCan I set the speed on individual ports? Frequently Asked QuestionsCan I daisy-chain hubs together with TPE cabling? Can I connect a 100BASE-T4 device to the hub?Returning a Defective Product RMA Limited Hardware WarrantyManufacturer Declaration Federal Communications Commission FCC StatementWarnung Intel BBS World Wide Web & Internet FTP