An input or output switch port for a network switch converts each incoming packet into a cell sequence stores each cell in a cell memory. The cash flow management system includes an electronic billing and invoicing computing system enabling generation and transmission of electronic bills based on business invoices and for displaying the generated bills for payment and an integrated receivables and reconciliation system receiving notification of received payments and for matching received payments with the generated invoices. The first surfaces of the electrically conductive portions are to respectively receive and be held in electrical contact with the terminals of the first electric part.