You can find the password recovery process for the 2948G here:
http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/12043-pswdrec-6000.html
Essentially:
- connect the console cable and establish a console session
- power-cycle the switch
- enter a blank password within 30 seconds of seeing the password prompt
- issue the "enable" command
- use "set password" to reset your new access password
- use "set enablepass" to set your new enable password
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Jody Lemoine, Network Architect
CCIE 41436, MTCRE, MTCINE, MTCIPv6E
tishco networks, Virtually Everywhere
(905) 378-1134, jody.lemoine@tishco.ca