Cisco C921-4P User Manual

To prevent the system from overheating, do not operate the devices in an area that exceeds the maximum
recommended ambient temperature. Statement 1047.
Table 3: Ambient Temperature of SKUs
Ambient TemperatureSKU
50 °CC921-4P
C931-4P
Internal PSU
45 °CC921J-4P
C926-4P
C927-4P
C927-4PM
External PSU
Warning
For altitudes above sea-level, de-rate the ambient operating temperature 1°C per 1000-feet of elevation.
Note
Cisco 900 series routers are fanless, normally run warm to the touch, and require adequate clearances for
proper heat dissipation and ventilation.
Note
Site Selection Guidelines
The Cisco 900 Series ISRs require specific environmental operating conditions. Temperature, humidity,
altitude, and vibration can affect the performance and reliability of the router. The following sections provide
specific information to help you plan for the proper operating environment.
The Cisco 900 Series ISRs are designed to meet the industry EMC, safety, and environmental standards
described in the Regulatory Compliance and Safety Information for the Cisco 900 Series ISR document.
Rack Requirements
Routers with internal Power Supplies can be mounted in a 19-inch rack using rack-mount brackets (optional
kit). Routers with external Power Supplies require a customer-provided tray for mounting in a rack.
The following information helps you plan your equipment rack configuration:
• Allow clearance around the rack for maintenance.
• Allow at least one rack unit of vertical space between routers; more clearance is required when stacking
multiple Cisco 900 Series ISRs. Provide adequate heat removal mechanism so that heat does not build
up in the rack and the air surrounding the router is well within the specified operating ambient temperature
condition.
Hardware Installation Guide for the Cisco 900 Series Integrated Services Router
11
Prepare for Router Installation
Site Selection Guidelines

Cisco C921-4P Specifications

General

Switch type	Managed
Quality of Service (QoS) support	Yes
USB 2.0 ports quantity	1
Basic switching RJ-45 Ethernet ports type	-
Basic switching RJ-45 Ethernet ports quantity	4
10G support	No
Networking standards	IEEE 802.1D
Product color	Black
Electromagnetic compatibility	47CFR, AS/NZS CISPR22 2, CISPR22, EN55022, ICES003, EN61000-3-2, KCC, EN55024, KN24
Flash memory	2048 MB
Internal memory	1024 MB
MAC address table	- entries
AC input voltage	100 - 240 V
AC input frequency	50 - 60 Hz
Storage temperature (T-T)	-40 - 70 °C
Operating temperature (T-T)	0 - 50 °C
Operating relative humidity (H-H)	5 - 95 %
Security algorithms	802.1x RADIUS
Harmonized System (HS) code	85176990

Weight and Dimensions

Depth	241.3 mm
Width	228.6 mm
Height	43.2 mm
Weight	1200 g