3Com SECPATH U200-CS Installation Manual page 18

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You can refer to the tables above when trying to identify or preparing the two types of Ethernet
cables.
When preparing Ethernet cables, follow the color pairings in the tables. Otherwise, communication
quality will be affected even if the two devices at both ends can communicate.
When preparing Ethernet cables, use shielded cables preferentially for electromagnetic
compatibility.
USB interface
USB interfaces can connect multiple types of devices and provide higher data transfer rates than
common parallel interfaces and serial interfaces.
The U200 series support USB 2.0 to provide important storage and security functions. For example,
with USB interfaces, you can provide large flash memory space for application programs, configuration
files, and VPN certificates for setting up secure VPN connections and, secure distribution of
configuration files.
In addition, USB interfaces provide a backup CF card mechanism to make file backup and restoration
easy and reliable.
Figure 1-13 USB interface
The USB interface provided by a U200 series device is a USB 2.0 type-A interface. Serving as a host, it
can connect an external USB device to expand the device's storage space for storing files and logs and
in addition, facilitate file transfer.
Signal direction
— Blue
— White (Blue)
RX- Green
— White (Brown)
— Brown
Category-5
Signal direction
twisted pair
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—
—
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