Figure 2 shows the front panel of the Cisco 3945 router.

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

Table 2 shows the LEDs area description.

Figure 3 shows the back panel of the Cisco router 3945/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.

Figure 4 shows the back panel of the Cisco 3945 router with slots and ports.

Note:
① Compact flash 0 and 1 (0, right) ② EHWIC 0,1,2 and 3 (0, far right) ③USB serial port ④RJ-45 serial console port ⑤AUX 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.

Figure 6 shows the internal view of the CISCO3945/K9.

Note:
The Cisco 3945 router supports two memory slots which has been installed two 512MB memory cards. When upgrading the memory, the same capacity of memory cards must be inserted into the two memory slots in the same time. It doesn't support to use only a single memory slot.