Differences

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--- networking:cisco-1921 [22/09/2025 14:35] – andrew
+++ networking:cisco-1921 [17/11/2025 14:00] (current) – [Optical Network Terminator] andrew
@@ Line 1: / Line 1: @@
 ====== Cisco 1921 Gigabit router ======
+===== Background =====
 {{: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.
+Also, there is a USB port in addition to the serial connector, this implements a usb to serial converter internally, it shows up as ''/dev/ttyACM0''.
 {{ :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.
+Note this is NOT the direct fibre from the ISP, they provide a single WDM / TDM fibre to the Optical Network Terminator (ONT) as part of the G-PON WAN network, then a Ethernet copper RJ45 from the ONT to a 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...
+==== First problem... ====
 <code>
@@ Line 37: / Line 43: @@
-Carrying on without the WIC interface, just a copy and paste from the previous but with ''GigabitEthernet'' rather than ''FastEthernet''.
+Carrying on without the WIC interface, just a copy and paste from the previous [[cisco-1841-config|1841 config]] but with ''GigabitEthernet'' rather than ''FastEthernet''.
-I had this before but didn't document it:-
+I had this problem before enabling SSH but didn't document it:-
 <code>
@@ Line 70: / Line 76: @@
 |                                                       |
 |  Legal Warning - Access forbidden unless authorized   |
-|                                                       |
-+-------------------------------------------------------+
-|             This is a private system and              |
-|      is only for the use of authorized personnel.     |
-|                                                       |
-+-------------------------------------------------------+
-|                                                       |
-|  If you are allowed access, you will have been told.  |
-|    If you have to ask anyone if you are authorized,   |
-|                                                       |
-|                   -*YOU AREN'T*-                      |
 |                                                       |
 +-------------------------------------------------------+
@@ Line 89: / Line 84: @@
-====== 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.
+==== Updating Flash ====
-The technology used for this is GPON.
+Having found an appropriate IOS which supports my WIC, I was able to tftp the file up to the flash: on the router, and then set the boot image to use the new image.
+If two images are present in flash, the router will boot off the first image it finds, this may not be the one you require, so set a boot image line. Once this new image is deemed stable, I will probably remove it from the router to an archive, and there will not be a requirement to set the image boot name.
+<code>
+router01#
+router01# copy tftp: flash:
+Address or name of remote host ?
+Source filename ?
+Destination filename [c1900-universalk9-mz.SPA.157-3.M2.bin]?
+Accessing tftp://192.168.x.y/c1900-universalk9-mz.SPA.157-3.M2.bin...
+Loading c1900-universalk9-mz.SPA.157-3.M2.bin from 192.168.x.y (via GigabitEthernet0/1): !!!!!!!!!!!!!!!!
+[OK - 85245200 bytes]
+85245200 bytes copied in 99.340 secs (858116 bytes/sec)
+router01#
+router01#sh flash:
+-#- --length-- -----date/time------ path
+     45801276 Jul 26 2012 09:32:54 c1900-universalk9-mz.SPA.150-1.M4.bin
+     85245200 Nov 16 2025 22:15:32 c1900-universalk9-mz.SPA.157-3.M2.bin
+125562880 bytes available (131047424 bytes used)
+router01#
+router01#conf t
+Enter configuration commands, one per line.  End with CNTL/Z.
+router01(config)#boot system flash c1900-universalk9-mz.SPA.157-3.M2.bin
+router01(config)#exit
+router01# copy run sta
+router01#
+</code>
+==== Running Config ====
+TODO
+<code>
+</code>
+====== Network Side ======
+Bit off topic but may be of some interest.
+===== 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 optical 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 (Believed to be a Nokia model)
-OpenReach ONT
 {{:networking:450px-fttp-ont-pon.jpg?100|}}
+===== Exchange End =====
+Getting more off-topic, but maybe of interest.
+{{networking:gpon-switch.jpg?200 |}}
+{{ :networking:fx-16-gpon.jpg?200 |}}
+{{ :networking:nokia_7360_data_sheet_en.pdf |}}
+----