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--- networking:cisco-ios-primer [24/06/2025 10:43] – [Cisco IOS primer] andrew
+++ networking:cisco-ios-primer [24/06/2025 10:48] (current) – [Cisco IOS primer] andrew
@@ Line 24: / Line 24: @@
 {{networking:consoleport.jpg?200 |Cisco console connections}} \\
 On a managed switch, you need to be able to access some sort of interface to control the switch, this is done via a serial port connection initially and then when the switch has an ip address allocated, it can be accessed over the network with either ssh or telnet.
-In the picture, there ports bounded by blue are the console ports. There is a rj45 for serial and a USB which emulates a serial port. This appears as /dev/ttyACM0. Using this avoids having to use an external usb to serial converter if your computer does not have a serial port. The four yellow ports at the bottom are for fibre modules ([[rb:sfp|sfp]]) to connect to, the yellow rj45 at the top is for connecting to a management ethernet network.
+In the picture, there ports bounded by blue are the console ports. There is a rj45 for serial and a USB which emulates a serial port. This appears as /dev/ttyACM0. (ttyACMx is created by devices that describe themselves as a CDC ACM device (**C**ommunication **D**evice **C**lass **A**bstract **C**ontrol **M**odel), they use the generic ACM driver). Using this avoids having to use an external usb to serial converter if your computer does not have a serial port. The four yellow ports at the bottom are for fibre modules ([[rb:sfp|sfp]]) to connect to, the yellow rj45 at the top is for connecting to a management ethernet network.
 ===== Config =====