Differences

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--- networking:cisco-1921 [22/09/2025 14:13] – [Optical Network Terminator] andrew
+++ networking:cisco-1921 [22/09/2025 15:55] (current) – [Optical Network Terminator] andrew
@@ Line 5: / Line 5: @@
 {{ :networking:cisco-ehwic-sfp.png?100|Without SFP module}}
-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.
+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.
 {{: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.
 First problem...
@@ Line 89: / Line 92: @@
 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