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cisco sg550xg-24t connected to safenet cn4020


I have two cisco sg550xg-24t's which is need to connect to two safenet cn4020 encryptors.

I have connected the devices however the leds on the switch dont appear to light up and under the ports it shows that the port is down.

I have connected the safenet devices together via a crossover cable and they appear to work correctly however when i connect them to the switch it doesn't bring up the interface.

Is there something i could be missing ? I'm aware that these switches use 'smart ports' which is have tried turning off however this doesnt make any difference , i also noted that perhaps the switch needed it's MTU value for the port lowered however there is no option to do this.

Any other troubleshooting tips would be appreciated!



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