Rainsbrook

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====== Catalyst 3100 Switch ======

Definately a Retro project, this is a 10 MB/s catalyst switch base unit with an expansion module called a "Flex Slot" above.
In fact this is so old that Cisco have a new Catalyst 3100 product ([[https://www.cisco.com/c/en/us/support/switches/catalyst-ie3100-rugged-series/series.html]]), a rugged industrial style switch with 1GB/s SFPs fitted!! Wow!! From 10MB/s to 1GB/s!

The base unit has the console serial port for setup, an AUI port which is shared with RJ45 E1, and another AUI labelled "SPAN". Not sure what this does yet. 

24 10MB/s ethernet ports are accessible on the front panel, there is an additional one which is hard wired through the backplane to the Flex Slot.

===== With Ethernet module =====

Just for fun here is one of the few pics on the internet of a 3100, this one is fitted with a module with two fast ethernet fibre on ST connectors I think:-
{{networking:retro:cisco-3100-wg-stack1.jpg|}}


===== With Router Module =====

{{:networking:retro:img_20250611_221927.jpg?600|}}

The switches I have are fitted with a router module, this is functionally the same as a 2500 router with two 60 pin sockets for the WAN, and an AUX serial connector. It also has an ISDN BRI socket.

Internally the ethernet0 interface is connected to the base unit backplane. The router serial console interface is accessed from the base unit console port with a command.

As I have three, I have several plans, one is to connect them in a triagle topography, so there is a full redundant WAN path between all devices, Also I have a [[networking:cisco7206|Cisco 7206]] router with a 8 port 2MB/s card so I could try to link this in somehow as a head office / branch office setup.

One issue is the DCE / DTE crossover on the WAN serial lines. Cisco did do some 60 pin to X21 DCE as well as DTE cables, so they could be connected together, but I have some [[telecoms:pdh-sdh#nokia_dnt2_data_network_terminal_2|Nokia DNT2]] G703 to SDSL units and BT branded X21 to G703 NTE units I really should have a play with. ([[telecoms:bt-nte8a|BT nte8a]] )

I think the G703 BNC ports can just be crossed over Rx to Tx, maybe with one set to the clock master. The Nokia DNT2 may be more fun as they connect back to the exchange with SDSL on two pairs, not sure if I can just cross Rx to Tx and expect them to work.

However, this picture from Nokia's documentation suggests this may be possible:-
{{:telecoms:dnt2-point-to-point-example.png?400 |}}






===== Possible topologies to experiment with =====

{{:networking:retro:cisco3100.png?200 |3 3100's in a Delta arrangement}} 

{{:networking:retro:cisco3100-7206.png?300 |}}


[[cisco1000router|Cisco 1000 router]] is a basic, one WAN port router.

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