This is a pdf about cisco 2911 router.

1. Cisco 2911 Specs
Cisco 2911 router, supporting voice module, is designed for medium-sized branch.
Cisco 2911 Specs
Release Date: 13-OCT-2009
AC Input Voltage: 100 to 240 VAC auto ranging
Compact Flash (External) - Default: slot 0: 256 MB; slot 1: none
Maximum End-Point PoE Power Capacity with PoE Boost (Watts): 750
Airflow: Side to side
SFP-Based Ports: 3
Temperature: 9,843 feet (3,000m ) Maximum Altitude : 32 to 77 F (0 to 25 C)
ISM Slots: 1
Modular LAN Switchports (with optional PoE): 24
Altitude: 13,000 ft (4,000m)
DC Input Voltage: 24 to 60 Vdc, autoranging positive or negative
Compact Flash (External) - Maximum: slot 0: 4 GB; slot 1: 4 GB
Temperature: 13,123 feet (4,000m) Maximum Altitude : 32 to 86 F (0 to 30 C)
Cisco Unified SRST Sessions: 50
Memory DDR2 ECC DRAM - Maximum: 2 GB
Onboard DSP (PVDM) Slots: 2
Wall-Mount (refer to installation guide for approved orientation): Yes
Double-Wide Service Module Slots: 1
Power Supply: AC; PoE; and DC
Serial console port: 1
Acoustic: Sound Pressure (Typical/Maximum): 51.8/62.9 dBA
USB Console port (Type B) (up to 115.2 kbps) 1: 1
Maximum Power with PoE Power Supply (Platform Only) (Watts): 250
AC Input Current: 2.2 to 1.0A range (max AC power supply)
Maximum Power with DC-PoE Power Supply (Platform Only) (Watts): 140
Dimensions (H x W x D): 3.5 x 17.25 x 12 in. (88.9 x 438.2 x 304.8 mm)
Rack Mounting Kit: Included
Weight with AC PoE Power Supply (No Modules): 19 lb (8.6 kg)
RPS Support (External): Cisco RPS 2300
EHWIC Slots: 4
Short-Term (per NEBS) Humidity :
5% to 90%, but not to exceed 0.024 kg water/kg of
dry air
Cisco Unified CCME Sessions: 50
Typical Weight Fully Configured : 21 lb (9.5 kg)

2. External USB 2.0 Flash Memory Slots (Type A): 2
AC Input Surge Current: < 50A
Integrated WAN Ports: 3 GE
Non-Operating Temperature: -40 to 176 F (-40 to 80 C)
Relative Humidity: 5 to 85%
Acoustic: Sound Power (Typical/Maximum): 58.5/70.3 dBA
Temperature: Short-Term (per NEBS) 5906 feet (1,800m) Maximum
Altitude:
23 F to 122 F (-5 to 50 C)
Temperature: 5,906 feet (1,800m) Maximum Altitude : 32 to 104 F (0 to 40 C)
Non-Operating Relative Humidity: 5 to 95%
Maximum End-Point PoE Power Available from DC PoE Power Supply
(Watts):
160
Weight with AC Power Supply (No Modules): 18 lb (8.2 kg)
Serial auxiliary port: 1
Embedded Hardware-Based Cryptography and Acceleration: Yes
RJ-45-based ports: 3
Optional Airflow Kit: Front to back
Memory DDR2 ECC DRAM - Default: 512 MB
Typical Power (No Modules) (Watts): 50
DC Input Current: (MAX) 8A (24V); 3.5A (60V)
Total onboard WAN 10-100-1000 Ports: 3
Rack-Mount 19 in. (48.3 cm) EIA: Optional
AC Input Frequency: 47 to 63 Hz
Double-Wide EHWIC Slots: 2
Service Module Slots: 0
Rack Units: 2 RU
Non-Operating Altitude: 15,000 ft (4,570m)
Maximum End-Point PoE Power Available from AC PoE Power Supply
(Watts):
200
Maximum Power with AC Power Supply (Watts): 210
The expansion slots and ports on the back panel.
①Compact flash 0 and 1 (0, right) ⑦10/100/1000 Ethernet port GE 0/0
②EHWIC 0,1,2 and 3 (0, far right) ⑧USB 1
③USB serial port ⑨Ground connector
④Console port ⑩USB 0
⑤AUX ⑪AC or DC or AC-POE Power module

3. ⑥10/100/1000 Ethernet port GE 0/1 and GE 0/2 (0/1, down)⑫Service module slot 1
Source:http://www.cisco.com/c/en/us/support/routers/2911-integrated-services-router-isr/model.html
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