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Diagram of a twin tower ATM with separate recycler and dispenser units

ATM

What Is a Twin Tower ATM?

A twin tower ATM, also called a dual tower ATM, has both a recycler unit for depositing and withdrawing cash and a dispenser unit for withdrawals only, cutting cash replenishment needs at busy locations.

Illustration of the internal cash tower unit inside an ATM

Payment Systems

What is a tower?

In payment systems, the tower is the section inside an ATM where cash is physically stored. It contains cassettes holding different banknote denominations, a mix cassette for mismatched notes, and various security mechanisms protecting the cash.

ATM dispenser unit showing cash cassettes

ATM

What is a Dispenser?

A dispenser is a part of the ATM. It contains cassettes where cash is loaded; these cassettes are configured during ATM installation. Based on the defined denomination, cash is loaded so the ATM can dispense that type to customers. Does every ATM have a dispenser?

ATM cash dispenser mechanism distributing banknotes

ATM

What Are the Cash Dispensing Algorithms Used in ATMs?

ATMs are important transaction points that let customers handle financial transactions without visiting a bank branch. 24/7 availability matters for customer satisfaction, so banks take steps to reduce both operational and cash costs.

Diagram illustrating the Greedy Algorithm used for ATM cash withdrawals

ATM

What is the Greedy Algorithm?

In payment systems, the Greedy Algorithm is used to give the customer the minimum number of banknotes when withdrawing cash from an ATM. The algorithm used varies from bank to bank, since ATM cash capacity and transaction volume differ. For example...