Model: Cisco 2851
 
Services and Slot Density
1000BASE-T Gigabit Ethernet (GE) Ports (RJ-45): 2
Universal Serial Bus (USB) Ports: 2
Console Port (RJ-45): 1
Auxiliary Port (RJ-45): 1
Network Modules: 1 network module (NM) or 1 network module enhanced (NME) or 1 network module enhanced extended (NME-X) or 1 network module double-wide (NMD) or 1 network module enhanced extended double-wide (NME-XD)
High-Speed WAN Interface Cards (HWICs): 4 single-wide (HWIC) or 2 double-wide (HWIC-D)
Extension Voice Modules (EVMs): 1
Advanced Integration Modules (AIMs): 2
Packet Voice Data Modules (PVDMs): 3
DRAM: Default memory—256 MB - Maximum memory—1024 MB3  
Boot/NVRAM: Internal 2-MB flash memory
Flash Memory: External CompactFlash memory 64 MB default - 256 MB maximum
 
Power Specifications
AC input without IP phone power output: 100 - 240 VAC, 3 A
AC input with IP phone power output: 100 - 240 VAC, 8 A
DC input without IP phone power output: 24 - 60 VDC, 12 A
IP Phone Power Output: 48 VDC, 360 W