Cisco C921-4P User Manual

To prevent bodily injury when mounting or servicing this unit in a rack, you must take special precautions to
ensure that the system remains stable. The following guidelines are provided to ensure your safety:
• This unit should be mounted at the bottom of the rack if it is the only unit in the rack.
• When mounting this unit in a partially filled rack, load the rack from the bottom to the top with the
heaviest component at the bottom of the rack.
• If the rack is provided with stabilizing devices, install the stabilizers before mounting or servicing the
unit in the rack. Statement 1006.
Warning
After the brackets are attached to the router, insert the router into the rack, and align the bracket in the rack. Use the
machine screws to secure the router in the rack.
Figure 13: Mounting the Cisco ISR 900 Series Router in a Rack
Allow at least one rack unit (1RU) of vertical space between routers. More clearance may be required when
stacking multiple products in the rack that could build up heat in the rack. Ensure that the ambient around the
router is within the ambient temperature specified in Table 3: Ambient Temperature of SKUs, on page 11.
Note
The local ambient (not room ambient) is measured below the router.
Note
Routers with external power supply can be mounted in a tray as shown in figure below.
Hardware Installation Guide for the Cisco 900 Series Integrated Services Router
20
Install and Connect the Router
Mount the Router

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