Cisco WS-C2950T-24 Hardware Installation Guide - Page 41
Integrated Service Modules, Packet Voice Data Modules, Memory, Slot 0
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Chapter 1 Overview of the Routers Hardware Features Table 1-7 EHWIC Support for SPE 200 and SPE 250 Slot 0 Slot 1 Slot 2 WIC/VIC and HWIC WIC/VIC, HWIC, EHWIC, DHWIC, and EDHWIC WIC/VIC and HWIC Integrated Service Modules Internal Services Modules (ISM) supersede advanced integration modules (AIM) on Cisco 2900 series and Cisco 3900 series ISRs. The ISM is larger in size than the AIM. Due to these physical differences, the AIM does not fit into the ISM slot and is no longer supported on Cisco 2900 series and Cisco 3900 series ISRs. Packet Voice Data Modules The Packet Voice Data Modules (PVDM3s) are the latest generation of PVDMs. First-generation PVDM-I cards are not supported in the PVDM3 slots. Due to physical differences, PVDM2s require an adapter for installation in the PVDM3 slot. See the for installation instructions. Note PVDM2 cards cannot be mixed with PVDM3s. Memory Cisco 2900 series and Cisco 3900 series routers contain the following types of memory: • DRAM-Stores the running configuration and routing tables and is used for packet buffering by the network interfaces. Cisco IOS software executes from DRAM memory. Supported module types are Unregistered Dual In-Line Memory Module (UDIMM) and very low profile registered DIMM (VLP RDIMM). Note UDIMMs and VLP RDIMMs are not interchangeable. • Boot/NVRAM-256K of internal non-volatile memory. Stores the bootstrap program (ROM monitor), the configuration register, and the startup configuration. • Flash memory-External flash memory. Stores the operating system software image. Each model supports 2 external CompactFlash 4-GB memory cards provide a maximum 8-GB of CompactFlash. Note You must use Cisco-qualified CompactFlash cards supporting True IDE PIO Mode 6 and True IDE Multiword DMA Mode 4 as defined in CompactFlash Specification Revision 4.1 of the CompactFlash Association. Use of any other cards during normal network operation can affect system performance. Table 1-8 summarizes the memory options for Cisco 2900 series and Cisco 3900 series routers. Default memory represents the minimum usable RAM. You can install additional RAM up to the maximum amount. Expansion memory modules are UDIMMs or VLP RDIMMs with error correction code (ECC). All onboard RAM uses ECC. OL-18712-02 Cisco 2900 Series and 3900 Series Hardware Installation Guide 1-21