Cisco C921-4P User Manual

• Maximum output power: 18W or 30W depending on the SKU
• Output voltage: +12VDC for system power
Specifications of Cisco 900 Series Integrated Services Routers
For specifications on the Cisco 900 Series ISRs, refer to the Cisco 900 series Specifications document.
Periodic Inspection and Cleaning
We recommend to periodically inspect and clean the external surface of the router to minimize the negative
impact from environmental dust or debris. The frequency of inspection and cleaning is dependent upon the
severity of the environmental conditions, but we recommend a minimum once in every six months. Cleaning
involves vacuuming router air intake and exhaust vents.
Sites with ambient temperatures consistently above 25°C and with potentially high levels of dust or debris
might require periodic preventative maintenance cleaning.
Note
Hardware Installation Guide for the Cisco 900 Series Integrated Services Router
7
Overview of Cisco 900 Series Integrated Services Routers
Specifications of Cisco 900 Series Integrated Services Routers

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