Quick Specs

Figure 1 shows the appearance of the CISCO3925/K9.

Product Details

Figure 2 shows the front panel of the Cisco 3925 router.

Note:
① On/Off switch ② Power connector ③ LEDs area

Table 2 shows the LEDs area description.

LED	Description
SYS status LED	Solid green	Solid green indicates normal operation.
	Blinking green	System is booting or is in ROM monitor mode.
	Amber	System error.
	Off	Power is off or system board is faulty.
ACT status LED	Solid or blinking green	Solid or blinking indicates packet activity between the forwarding and routing engine and any I/O port.
	Off	No packet transfers are occurring.
POE	Green	IP phone power is on.
	Amber	IP phone power is not on.
PS1 / PS2	Green	System is running.
	Amber	System is not running.

Figure 3 shows the back panel of the Cisco router 3925/K9 with LEDs.

Note:
① Compact flash 0 and 1 (0, right) ② ISM ③ PVDM3 0,1,2 and 3 (0, far right) ④ EN (Enable USB console) ⑤ EN (Enable RJ-45 console) ⑥ SFP S ⑦ SFP EN ⑧ S (Speed) ⑨ L (Link)

Table 3 shows the description of these LEDs on the back panel.

LED	Color	Description	Location
CompactFlash 1	Green	Flash memory is busy.	Back Panel
	Amber	Initialized with error.
	Blinking Green then turns off	CompactFlash is ready for removal.
CompactFlash 0	Green	Flash memory is busy.	Back Panel
	Amber	Initialized with error.
	Blinking Green then turns off	CompactFlash is ready for removal.
S (Speed)	1 blink + pause	GE port operating at 10 Mb/s.	Back Panel
	2 blink + pause	GE port operating at 100 Mb/s.
	3 blink + pause	GE port operating at 1000 Mb/s.
L (Link)	Green	GE link is established.	Back Panel
	Off	No GE link is established.
EN (RJ-45 console port)	Green	The RJ-45 console port is active.	Back Panel
EN (USB serial console port)	Green	The USB console port is active.	Back Panel
ISM	Green	Initialized.	Back Panel
	Amber	Initialized with error.
	Off	Not installed.
PVDM3 0,1,2 and 3	Green	PVDM is initialized.	Back Panel
	Amber	PVDM is detected but not initialized.
	Off	No PVDM installed.
SFP S	Blinking green	Blinking frequency indicates port speed.	Back Panel
SFP EN	Off	Not present.	Back Panel
	Green	Present and enabled.
	Amber	Present with failure.

Figure 4 shows the back panel of the Cisco 3925 router with slots and ports.

Note:
① Compact flash 0 and 1 (0, right) ② EHWIC 0,1,2 and 3 (0, far right) ③ USB serial port ④ RJ-45 serial console port ⑤ AUX port ⑥ SFP 1 and SFP 2 (2, top) 
⑦ 10/100/1000 Ethernet port GE 0/1 and GE 0/2 (GE 0/1, down) ⑧ 10/100/1000 Ethernet port GE 0/0 ⑨ USB 0 and USB 1 (1,top) ⑩ Ground ⑪ Service module slots

Figure 5 shows the SPE area and you can upgrade these slots and ports directly by one SPE module.
The Cisco 3900 Series offers field-replaceable SPEs which allow you to protect your initial investment in the Cisco 3900 platform for a longer time period and scale router performance as your network and branch-office needs grow.