Brocade Mobility 7131 Installation Guide - Dependent Mode (Supporting software release 4.1.0.0 and later) - Manual (Page 39)

Configuring basic device settings
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Brocade Mobility 7131 Installation Guide - Dependent Mode 31
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4. Configure the WEP 128 Setting field as required to define the Pass Key used to
generate the WEP keys .
5. Click the Apply button to save the security policy and return to the Mobility
7131 Quick Setup screen.
At this point, you can either restrict specific Client access to the Mobility 7131
(using the Mobility 7131 ACL) or test the Mobility 7131 for Client
interoperability.
Pass key Specify a 4 to 32 character pass key and click the Generate button.
The Mobility 7131, other proprietary routers and Brocade Clients use
the same algorithm to convert an ASCII string to the same
hexadecimal number. Non-Brocade clients and devices need to enter
WEP keys manually as hexadecimal numbers. The Mobility 7131 and
its target client(s) must use the same pass key to interoperate.
Keys #1-4 Use the Key #1-4 fields to specify key numbers. For WEP 64 (40-bit
key), the keys are 10 hexadecimal characters in length. For WEP 128
(104-bit key), the keys are 26 hexadecimal characters in length. Select
one of these keys for activation by clicking its radio button. The
Mobility 7131 and its target client(s) must use the same key to
interoperate.