Cisco ISR 4K Product Numbering

Here’s a secret decoder ring for the part numbers of the 4000 series of the Cisco Integrated Services Routers.

First digit = the family, all are 4

Second digit = the sub-family with 4 (highest performance), 3 (middle performance), and 2 (lowest performance)

The third digit = total number of slots, the sum of NIM and SM

The fourth digit = 1, identifying the first in that series. Allows for incrementing for the subsequent platforms in the series.

Here’s a link to the ISR 4000 model platform comparison