1-7
Cisco 2900 Series and 3900 Series Hardware Installation Guide
OL-18712-02
Chapter 1 Overview of the Routers
Chassis Views
Figure 1-8
Back Panel Slots and Connectors on the Cisco 2921 and 2951 Routers
5
SYS
6
ACT
7
POE
8
RPS
9
PS
2
1.
LED goes off if the AC power fails or is disconnected. It does not go on and off with the power switch.
2.
Power supply (PS)
1
EHWIC slots
1
0,1,2, and 3 (0, Far right)
1.
Double-wide EHWICs can fit into slot 0 and 1, and into slot 2 and 3. EHWIC slots support HWIC, VIC, and WIC.
2
USB serial console port
3
AUX port
4
RJ-45 serial console port
5
SFP
6
10/100/1000 Ethernet ports (GE 0/1 and GE 0/2
(GE 0/2, Top)
7
10/100/1000 Ethernet port GE 0/0
8
Ground
9
USB0 and USB1 (1, Top)
10
Service module slots
2
SM1 and SM2 (1, Right on 2951),
(1, left on 2921)
2.
Service module slots support legacy network modules when inserted with an adapter. See the router product page at Cisco.com for a list of supported
modules. Cisco 2921 supports only one service module in the left slot.
11
CompactFlash
3
0 and 1 (0, Right)
3.
Only Advanced Capability CF purchased from Cisco operates in Cisco 2900 series and Cisco 3900 series ISRs. Legacy CF will not operate in these
routers. When legacy CF is inserted, the following error message appears:
WARNING: Unsupported compact flash detected. Use of this card during normal operation can impact and
severely degrade performance of the system. Please use supported compact flash cards only.
DO NOT REMOVE DURING
NETWORKING OPERATION
ISM
PVDM2
PVDM1
PVDM0
2
1
EN
EN
SFP
S
E
N
S
L
S
L
USB
1
0
CONSOLE
AUX
GE 0/1
GE 0/2
G
E
0
/
0
DO NOT REMOVE DURING
NETWORKING OPERATION
250900
3
6
2
5
7
9
1
8
10
10
11
11
4
EHWIC 3
EHWIC 2
EHWIC 1
EHWIC 0
CF 1
CF 0
2921
SM SLOT
1