Overview
This article provides connectivity examples for hub-to-hub, hub-to-transceiver, transceiver-to-transceiver, pinouts and color coding for standard ethernet cabling.
 

Discussion
 

Crossover Cable RJ-45 PIN RJ-45 PIN 1 Rx+ 3 Tx+ 2 Rc- 6 Tx- 3 Tx+ 1 Rc+ 6 Tx- 2 Rc-

Straight Through Cable RJ-45 PIN RJ-45 PIN 1 Tx+ 1 Rc+ 2 Tx- 2 Rc- 3 Rc+ 3 Tx+ 6 Rc- 6 Tx-

Please Note: The standard connector view shown is color-coded for a straight thru cable assembly, when connecting Hub to Xcvr or DNI Card. When connecting hub to hub, Xcvr to Xcvr, or DNI to DNI, the wires must crossover at the opposite end of the cable assembly.

Interconnecting Your Hubs, Transceivers, and DNI Cards

As noted in the illustrations below, a crossover cable is required when connecting a Hub to a Hub, or a Transceiver to Transceiver, or DNI to DNI card, or Transceiver to DNI card. When connecting a Hub to a transceiver or DNI card, a straight through cable is always used. Please Note: Some Cabletron products are equipped with internal switches that can internally cross the twisted pairs.

In these illustrations a Hub can refer to any standalone product, such as the SEHI or MicroMMAC; or concentrator modules in MMAC-FNB or MMACPLUS hubs, such as a TPMIM-xx, TPRMIM-xx or 9E132-15. To note the differences between Ethernet, Token Ring and FDDI/ATM connectivity, refer to the Wiring Color Code Standards.

Hub to Hub Connectivity

Hub to Transceiver or DNI Card Connectivity

Transceiver to DNI Connectivity

Standard Ethernet Cable Part Numbers

Category 5 wiring standards:

EIA/TIA 568A/568B and AT&T 258A define the wiring standards and allow for two different wiring color codes.

• Pairs may be solid colors and not have the stripe.
• Category 5 cable must use Category 5 rated connectors.