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Cisco 3020 internal cross-connect

Hey, network professionals!

I found the following text about the Cisco 3020 switch:

Dual-purpose external/internal 10/100/1000BASE-T copper Gigabit Ethernet uplink ports. These
ports can be configured for internal 1000BASE-X cross-connection with a corresponding switch
module. When ports 23x and 24x are in external operation mode, they support auto-MDIX and
autonegotiation. The default is external operation mode.

But how exactly are the internal connections between my 6 cisco 3020 switches in the c7000 HP Blade enclosure ?

What does "corresponding switch module" means ?

Thank you

Constantin

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