GBIC modules::
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3640 router (incredible lab router):
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T1 WIC interface:
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Voice NM-2V module for 3600:
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Fast ethernet for 3600:
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Voice VIC FXS module:
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Check them out! I start all of my auctions at a cent (with no reserve!). I'm an experienced networker, so if you have questions, let me know. Take care--good luck!