The Cisco 3640 has four slots. Each network module slot accepts a variety of network module interface cards, including LAN and WAN mixed media cards supporting Ethernet, Fast Ethernet, Token Ring, and a variety of WAN technologies. These cards provide the foundation of LAN and WAN connectivity on a single, modular, network module. Additional applications are supported with a series of network module cards offering digital modems, asynchronous and synchronous serial, ISDN PRI, and ISDN BRI interfaces.
Router Specs:
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80-MHz IDT R4700 RISC Processor
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Dual Type II PC Card Slots
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Four Network Module Slots
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One Console Port
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One Aux Port (for connecting external modems, etc)