Siemens Rolm has modified the 9751's bandwidth highway structure, extended redundancy and introduced enhanced system diagnostics and service options.
Redundancy is very important for call centers in which lost calls often mean lost revenue.
Increased Fault Tolerance Critical components on the shelf controller card are now redundant, so failure of a card component will cause only a small decrease in system capacity, rather than knocking out dial tone to all users serviced by those particular shelves. The new design enables redundancy of the bandwidth highways, even on non-redundant systems, so failure of a card component will cause only a small decrease in system capacity. All ports will remain fully functional. The design offers an intermediate level of redundancy without additional backup cabinets. Siemens Rolm also enhanced system redundancy by offering optional redundant shelf power supplies.