Cisco 7541 Hardware Installation Manual page 51

Chapter 5 WAVE Interface Modules
Some switches support automatic medium-dependent interface crossover (MDIX). You can configure
MDIX by using the mdix auto global configuration switch command. If your switch supports MDIX,
you do not need to follow these cabling rules because MDIX automatically adjusts transmit and receive
pairs when an incorrect cable type (crossover or straight-through) is installed on a 10/100 Fast Ethernet
port. However, when you configure MDIX, you must also configure the port to use autosense (not
manual selection of speed/duplex).
Caution
If you are connecting to Fast Ethernet ports on both the LAN and the WAN sides of the WAVE inline
appliance, you must consider the types of devices that are being connected, and you must use the correct
cables. You must follow these cabling instructions for the inline network adapter to work properly. (See
Table
Ethernet
To connect the inline network adapter using the correct cables for Fast Ethernet connections, follow
these steps:
Step 1
Determine the type of cable that you would use for a direct connection between your two end devices
(without a WAVE inline network appliance connected between them) by using the following standard
cabling rules:
•
When you are directly connecting two network devices that are similar, such as two switches, use a
crossover cable.
•
When you are directly connecting two network devices that are different, such as a switch and router,
use a straight-through cable.
Note
Table 5-6
Ethernet end to end.
Table 5-6
Connection
Switch to switch (no WAVE)
Switch to router (no WAVE)
Router to router (no WAVE)
Switch to WAVE and
WAVE to Router
Switch to WAVE and
WAVE to Switch
Router to WAVE and
WAVE to Router
WAVE to WAVE
5-6. For illustrations and examples, see
Connections.)
Because the inline network adapter has an internal crossover connection that becomes active
when the InlineGroup interface is placed in mechanical bypass mode, you must decide which
cable you would use to connect the two network devices directly, and then you must install the
other cable type (on one side, usually the WAN side of the inline appliance) instead.
shows the cable requirements for WAVE and non-WAVE connections when you are using Fast
Cable Requirements for WAVE Connections Using Fast Ethernet
Cisco Wide Area Virtualization Engine 7541, 7571, and 8541 Hardware Installation Guide
Network Adapter Cabling Requirements
Installation Scenarios and Cabling Examples for Fast
Required Cable
Crossover
Straight-through
Crossover
Straight-through
Crossover
Straight-through
Straight-through
Straight-through
Straight-through
Crossover
5-9