This product is either discontinued or we cannot get that from suppliers.
Allied Telesis 48-port AT-GS948MPX, Ethernet Switch, Expansion Slots -4, Twisted Pair, Optical Fiber, Network Ports 48, Power Supply, Network 10/100/1000Base-T, 1000Base-X, 10GBase-X.
Allied Telesis CentreCOM GS900MX/MPX Series switches are cost-effective, fully managed, and stackable. The switches in this series can serve as an AMF node when an AMF Master switch is available in the network.