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Services and Slot Density Cisco 3945E Cisco 3925E Cisco 3945 Cisco 3925
Dimensions (H x W x D) 5.25 x 17.25 x 18.75
in.
(133.35 x 438.15 x
476.25 mm)
5.25 x 17.25 x 18.75
in.
(133.35 x 438.15 x
476.25 mm)
5.25 x 17.25 x 18.75
in.
(133.35 x 438.15 x
476.25 mm)
5.25 x 17.25 x 18.75
in.
(133.35 x 438.15 x
476.25 mm)
Rack height 3 rack units (3RU) 3RU 3 RU 3RU
Rack-mount 19in. (48.3 cm) EIA included included included included
Rack-mount 23in. (58.4 cm) EIA optional optional optional optional
Wall-mount No No No No
Weight with AC power supply (no modules) 39 lb (17.7 kg) 39 lb (17.7 kg) 39 lb (17.7 kg) 39 lb (17.7 kg)
Weight with PoE power supply (no modules) 40 lb (18.1 kg) 40 lb (18.1 kg) 40 lb (18.1 kg) 40 lb (18.1 kg)
Typical weight (with modules) 60 lb (27.2 kg) 60 lb (27.2 kg) 60 lb (27.2 kg) 60 lb (27.2 kg)
Airflow Back to front Back to front Back to front
Back to front
Optional airflow kit (includes filter) None None Front to Back Front to Back
Environmental specifications
Operating conditions
Temperature: 5906 ft (1800m) maximum altitude 32 to 104ºF (0 to
40ºC)
32 to 104ºF (0 to
40ºC)
32 to 104ºF (0 to
40ºC)
32 to 104ºF (0 to
40ºC)
Temperature: 9843 ft (3000m) maximum altitude 32 to 104ºF (0 to
40ºC)
32 to 104ºF (0 to
40ºC)
32 to 104ºF (0 to
40ºC)
32 to 104ºF (0 to
40ºC)
Temperature: 13123 ft (4000m) maximum
altitude’
32 to 86ºF (0 to 30ºC) 32 to 86ºF (0 to 30ºC) 32 to 86ºF (0 to 30ºC) 32 to 86ºF (0 to 30ºC)
Temperature: Short-term per NEBS/5906 ft
(1800m) maximum altitude
23 to 122°F (–5 to
50°C)
23 to 122°F (–5 to
50°C)
23 to 122°F (–5 to
50°C)
23 to 122°F (–5 to
50°C)
Altitude 4000m (13000 ft) 4000m (13000 ft) 4000m (13000 ft) 4000m (13000 ft)
Relative humidity 5 to 85% 5 to 85% 5 to 85% 5 to 85%
Short-term (per NEBS) humidity 5% to 90%, not to
exceed 0.024 kg
water/kg of dry air
5% to 90%, not to
exceed 0.024 kg
water/kg of dry air
5% to 90%, not to
exceed 0.024 kg
water/kg of dry air
5% to 90%, not to
exceed 0.024 kg
water/kg of dry air
Acoustic: Sound pressure (typical/maximum) 57.6/77.6 57.6/77.6 57.6/77.6 57.6/77.6
Acoustic: Sound power (typical/maximum) 67.8/84.7 67.8/84.7 67.8/84.7 67.8/84.7
Nonoperating conditions 2
Temperature –40 to 158ºF (–40 to
70ºC)
–40 to 158ºF (–40 to
70ºC)
–40 to 158ºF (–40 to
70ºC)
–40 to 158ºF (–40 to
70ºC)
Relative humidity 5 to 95% 5 to 95% 5 to 95% 5 to 95%
Altitude 15,584 ft (4750m) 15,584 ft (4570m) 15,584 ft (4750m) 15,584 ft (4570m)
Regulatory and Compliance
Safety UL 60950-1
CAN/CSA C22.2 No.
60950-1
EN 60950-1
AS/NZS 60950-1
IEC 60950-1
UL 60950-1
CAN/CSA C22.2 No.
60950-1
EN 60950-1
AS/NZS 60950-1
IEC 60950-1
UL 60950-1
CAN/CSA C22.2 No.
60950-1
EN 60950-1
AS/NZS 60950-1
IEC 60950-1
UL 60950-1
CAN/CSA C22.2 No.
60950-1
EN 60950-1
AS/NZS 60950-1
IEC 60950-1
