The cisco 2600 series uses two types of replaceable or upgradeable memory: dram and flash. Dram memory is implemented with up to two dimms in any combination of sizes. Flash memory is implemented with a single simm or internal compact flash for the cisco 2691. The cisco 2610 through cisco 2651 ships standard with 32 mb of dram memory, which can be upgraded to a maximum of 64 mb in the cisco 261x and 262x (up to 32 mb in each socket) and up to 128 mb in the cisco 265x (up to 64 mb in each socket). The cisco 2600xm models ship standard with 32mb of dram for the cisco 2610xm through cisco 2621xm and 64mb of dram for the cisco 2650xm, 2651xm and cisco 2691 (up to 64 mb in each socket for the cisco 2600xm models and up to 128mb in each socket for the cisco2691). Sku 658755. Specifications: processor type: 50 mhz cpu. Performance: 30kpps. Flash memory: 16 mb/48 mb. System memory: 32 mb/128 mb. Integrated wic slots: 2. Onboard aim (internal) slot: 1. Console port (up to 115.2 Kbps): 1. Aux port (up to 115.2 Kbps): 1. Minimum cisco ios release: 12.1(14) Mainline, 12.2(X) mainline (future), 12.2(8)T1or later. Onboard lan ports: 1 to 2 10/100 fe ports. Redundant power supply: external only. Rack mounting: 19 and 23 options.