SONET data byte switch

A method for transferring data from one or more plurality of input ports to one or more plurality of output ports in a switch, the method comprising:

• receiving data at said one or more plurality of input ports;
• writing said data to a first memory bank at a timeslot;
• reading data from the first memory bank at said timeslot;
• writing said data read from the first memory bank to a second memory bank;
• reading data from the second memory bank;
• and
• comparing a write address of the first memory bank with a read address of the first memory bank and selecting data for output from the first memory bank if said write address is smaller than said read address and selecting data from the second memory bank if said read address is equal to or smaller than said write address.

A switch system, comprising:

• means for receiving data at one or more plurality of input ports;
• means for writing said data to a first memory bank at a timeslot;
• means for reading data from the first memory bank at said timeslot;
• means for writing said data read from the first memory bank to a second memory bank;
• means for reading data from the second memory bank;
• and
• means for comparing a write address of the first memory bank with a read address of the first memory bank and selecting data for output from the first memory bank if said write address is smaller than said read address and selecting data from the second memory bank if said read address is equal to or smaller than said write address.