Do you know difference C4500E-6NR-7E-UPOE and C4500E-S6-UPOE ?I checked price by Cisco Commerce Workspace, - C4500E-6NR-7E-UPOE is about 1,000,000 yen. - C4500E-S6-UPOE is about 200,000 yen. What is this ? Is C4500E-6NR-7E-UPOE module ? Is C4500E-S6...