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--- networking:cisco-1921 [20/06/2025 17:55] – andrew
+++ networking:cisco-1921 [22/09/2025 15:55] (current) – [Optical Network Terminator] andrew
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 ====== Cisco 1921 Gigabit router ======
+{{:networking:cisco1921.png?400 |Cisco 1921}}
+Replaces [[cisco-1841|Cisco ADSL & 1841 router]] as this is a Fast Ethernet only router, the 1921 is a similar router but with Ge0/0 and Ge0/1 interfaces and two hwic slots. I have a EHWIC-1GE-SFP-CU card as well because in the foreseeable future I may need to bring the internet in from the ISP ONT some distance away, so a utp to fibre next to the ONT would link to the WIC SFP port.
+{{ :networking:cisco-ehwic-sfp.png?100|Without SFP module}}
+Note this is NOT a direct fibre from the ISP, it is  a single WDM fibre to the ONT, then a Ethernet to fibre converter and on to the 1941 SFP fibre in a different building.
-Replaces [[cisco-1841|Cisco ADSL & 1841 router]] as this is a Fast Ethernet only router, the 1921 is a similar router but with Ge0/0 and Ge0/1 interfaces and two hwic slots. I have a EHWIC-1GE-SFP-CU card as well because in the foreseeable future I will need to bring the internet in from the ISP ONT. Note this is NOT a direct fibre from the ISP, it is fibre to the ONT, then a Ethernet to fibre converter and on to the 1941 SFP fibre in a different building.
+{{:networking:ehwic-1ge-sfp.png?200|sfp fibre module fitted}}
+Also, there is a USB port in addition to the serial connector, this implements a usb to seial converter internally, it shows up as /dev/ttyACM0.
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+====== Optical Network Terminator ======
+Just for completeness, this is the ONT. it has a single fibre input from OpenReach and a Gigabit ethernet port on an RJ45 for the Subs side interface.
+The technology used for this is GPON.
+[[https://www.draytek.co.uk/information/blog/gpon-fibre-fttp-what-is-it-and-how-does-it-work]]
+[[https://www.cisco.com/c/en/us/support/docs/switches/catalyst-pon-series/216230-understand-gpon-technology.html]]
+OpenReach ONT
+{{:networking:450px-fttp-ont-pon.jpg?100|}}
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