Is the management module necessary to do stacking?
Since stacking is achieved by using normal networking ports (100TX or 10BaseT), no management module is required to stack or interconnect these switches. There is no port trunking feature on the Switch 208T/224T so the maximum bandwidth allowed between two unmanaged switches is 100 Mb/s. If the Management Module is used then the ports may be configured to Full Duplex, and then the bandwidth between the switches will be 200 Mbps.