Motorola AP-7131 Product Reference Manual page 79

Getting Started 3-13
4. Configure the WEP 128 Settings field as required to define the Pass Key used to generate
the WEP keys .
Generate
Pass Key Specify a 4 to 32 character pass key and click the
button. The access point, other proprietary routers and MUs use
the same algorithm to convert an ASCII string to the same
hexadecimal number. Non-Motorola clients and devices need to
enter WEP keys manually as hexadecimal numbers. The access
point and its target client(s) must use the same pass key to
interoperate.