3Com WL-603 - Manual (Page 51)

Accessing the Setup Wizard 49
2 Click Next.
Note that all four WEP keys on each device of the same wireless network
must be identical.
128-bit WEP
WEP is the basic mechanism to transmit your data securely over the
wireless network. Matching encryption keys must be set up on your
Router and wireless client devices to use WEP.
Figure 36 128-bit WEP
To enable 128-bit WEP:
1 You can enter the 128-bit WEP key manually, enter your WEP key as 13
pairs of hex digits (0-9, A-F). Or you can generate the 128-bit WEP key
automatically, enter a memorable passphrase in the Passphrase box, and
then click Generate to generate the hex keys from the passphrase.
2 Click Next.
Note that the WEP keys on each device of the same wireless network
must be identical. And In 128-bit WEP mode, only one WEP key can be
specified.