clExtWepCipherKeyIndex 1.3.6.1.4.1.9.9.9998.1.1.4.1.1.10

This object represents the key index of WEP. According to 802.11 standard 4 keys are supported. So 802.11 Mobile Stations(Client) can have upto 4 keys. This index is for informing Mobile Station which key it should use for Static WEP Authentication.