MT90870AG

Device Overview
The MT90870 has two data ports, the Backplane and the Local port.
The Backplane port has two modes of operation, either 32 input and 32 output streams operated at 2.048 Mb/s, 4.096 Mb/s, 8.192 Mb/s or 16.384 Mb/s, in any combination, or 16 input and 16 output streams operated at 32.768 Mb/s.
The Local port has 16 input and 16 output streams operated at 2.048 Mb/s, 4.096 Mb/s, 8.192 Mb/s or 16.384 Mb/s, in any combination.
The MT90870 contains two data memory blocks (Backplane and Local) to provide the following switching path configurations:
• Backplane-to-Local, supporting 8 K x 4 K data switching,
• Local-to-Backplane, supporting 4 K x 8 K data switching,
• Backplane-to-Backplane, supporting 8 K x 8 K data switching.
• Local-to-Local, supporting 4 K x 4 K data switching.
The device contains two connection memory blocks, one for the Backplane output and one for the Local output. Data to be output on the serial streams may come from either of the data memories (Connection Mode) or directly from the connection memory contents (Message Mode).
Features
• 12,288-channel x 12,288-channel non-blocking unidirectional switching.
The Backplane and Local inputs and outputs can be combined to form a non-blocking switching matrix with 48 stream inputs and 48 stream outputs
• 8,192-channel x 4,096-channel blocking Backplane to Local stream switch
• 4,096-channel x 8,192-channel non-blocking Local to Backplane stream switch
• 8,192-channel x 8,192-channel non-blocking Backplane input to Backplane output switch
• 4,096-channel x 4,096-channel non-blocking Local input to Local output stream switch
• Rate conversion on all data paths, Backplane to Local, Local to Backplane, Backplane to Backplane and Local to Local streams
• Backplane port accepts 32 ST-BUS streams with data rates of 2.048 Mb/s, 4.096 Mb/s, 8.192 Mb/s or 16.384 Mb/s in any combination, or a fixed allocation of 16 streams at 32.768 Mb/s
• Local port accepts 16 ST-BUS streams with data rates of 2.048 Mb/s, 4.096 Mb/s, 8.192 Mb/s or 16.384 Mb/s, in any combination
• Per-stream channel and bit delay for Local input streams
• Per-stream channel and bit delay for Backplane input streams
• Per-stream advancement for Local output streams
• Per-stream advancement for Backplane output streamsApplications
• Central Office Switches (Class 5)
• Mediation Switches
• Class-independent switches
• Access Concentrators
• Scalable TDM-Based Architectures
• Digital Loop Carriers