Cisco CCNA Study Guide - Router Alley

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CCNA Study Guide v2.62 – Aaron Balchunas 32 Twisted-Pair Cabling – Crossover Cable A crossover cable is used in the following circumstances: • From a host to a host – MDI to MDI • From a hub to a hub - MDIX to MDIX • From a switch to a switch - MDIX to MDIX • From a hub to a switch - MDIX to MDIX • From a router to a router - MDI to MDI Remember that a hub or a switch will provide the crossover function. However, when connecting a host directly to another host (MDI to MDI), the crossover function must be provided by a crossover cable. A crossover cable is often required to uplink a hub to another hub, or to uplink a switch to another switch. This is because the crossover is performed twice, once on each hub or switch (MDIX to MDIX), negating the crossover. Modern devices can now automatically detect whether the crossover function is required, negating the need for a crossover cable. This functionality is referred to as Auto-MDIX, and is now standard with Gigabit Ethernet, which uses all eight wires to both transmit and receive. Auto- MDIX requires that autonegotiation be enabled. To create a crossover cable, the transmit pins must be swapped with the receive pins on one end of the cable: • Pins 1 and 3 • Pins 2 and 6 Pin# Connector 1 Connector 2 Pin# 1 2 3 4 5 6 7 8 White Orange Orange White Green Blue White Blue Green White Brown Brown ------------------------ ------------------------ ------------------------ ------------------------ ------------------------ ------------------------ ------------------------ ------------------------ White Green Green White Orange Blue White Blue Orange White Brown Brown 3 6 1 4 5 2 7 8 Note that the Orange and Green pins have been swapped on Connector 2. The first connector is using the TIA/EIA-568B standard, while the second connector is using the TIA/EIA-568A standard. * * * All original material copyright © 2013 by Aaron Balchunas (aaron@routeralley.com), unless otherwise noted. All other material copyright © of their respective owners. This material may be copied and used freely, but may not be altered or sold without the expressed written consent of the owner of the above copyright. Updated material may be found at http://www.routeralley.com.
CCNA Study Guide v2.62 – Aaron Balchunas 33 Twisted-Pair – Rollover Cable A rollover cable is used to connect a workstation or laptop into a Cisco device’s console or auxiliary port, for management purposes. A rollover cable is often referred to as a console cable, and its sheathing is usually flat and light-blue in color. To create a rollover cable, the pins are completely reversed on one end of the cable: Pin# Connector 1 Connector 2 Pin# 1 2 3 4 5 6 7 8 White Orange Orange White Green Blue White Blue Green White Brown Brown ------------------------ ------------------------ ------------------------ ------------------------ ------------------------ ------------------------ ------------------------ ------------------------ Brown White Brown Green White Blue Blue White Green Orange White Orange Rollover cables can be used to configure Cisco routers, switches, and firewalls. 8 7 6 5 4 3 2 1 * * * All original material copyright © 2013 by Aaron Balchunas (aaron@routeralley.com), unless otherwise noted. All other material copyright © of their respective owners. This material may be copied and used freely, but may not be altered or sold without the expressed written consent of the owner of the above copyright. Updated material may be found at http://www.routeralley.com.
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