Modern Automated Teller Machines (ATMs) are connected to financial and interbank networks, allowing customers to access banking services beyond their own bank’s ATM. These networks enable ATMs operated by different banks and financial institutions to communicate securely with one another, making banking services more convenient and widely accessible.
Through these financial networks, customers can perform transactions such as cash withdrawals, cash deposits, balance inquiries, and other banking operations even when using an ATM that does not belong to their own bank. In many cases, these networks also support international transactions, allowing customers to withdraw cash in the local currency while travelling abroad.
Interbank Networks
An interbank network is a communication system that connects the ATMs of multiple banks and financial institutions. Instead of restricting customers to the ATMs of their own bank, these networks allow banking transactions to be processed across participating institutions.
As a result, customers can use ATMs belonging to other banks or located in different countries while still accessing their own bank accounts.
Some well-known interbank ATM networks include:
- NYCE
- PULSE
- PLUS
- Cirrus
- AFFN
- Interac
- Interswitch
- STAR
- LINK
- MegaLink
- BancNet
These networks play an important role in providing seamless banking services across different regions and financial institutions.
Benefits of Interbank Networks
| Benefit | Description |
|---|---|
| Cross-Bank Access | Allows customers to use ATMs operated by other banks. |
| International Transactions | Enables cash withdrawals in foreign countries using local currency. |
| Greater Convenience | Expands the availability of ATM services beyond the customer’s own bank. |
| Network Connectivity | Connects multiple financial institutions through a common transaction network. |
Transaction Authorization
Whenever a customer performs a transaction at an ATM, the machine does not process the transaction independently. Instead, it sends a request through the financial communication network to obtain authorization.
The transaction is verified by the card-issuing bank or another authorized financial institution. This institution checks important information such as the validity of the card, the customer’s Personal Identification Number (PIN), account balance, withdrawal limits, and transaction permissions before approving or rejecting the request.
Most ATM transactions are processed using the ISO 8583 messaging standard, an internationally recognized communication protocol used for exchanging electronic financial transaction information between ATMs, banks, and payment processing systems.
ATM Usage Fees
Many banks charge ATM usage fees for certain transactions. The amount and conditions of these charges vary depending on the policies of the bank and the financial network involved.
In many cases, ATM fees are charged only when customers use an ATM operated by another bank. However, some banks may charge fees for every ATM transaction, including those performed by their own customers.
The applicable fee structure generally depends on the bank’s policies, the type of account, and the agreements between participating financial institutions.
ATM Fee Policies
| Situation | Possible Charges |
|---|---|
| Using Another Bank’s ATM | Banks may charge an ATM usage fee. |
| Using Own Bank’s ATM | Some banks may not charge a fee, while others may apply transaction charges depending on their policies. |
Expanded ATM Network Access
To support a wider range of financial devices, some interbank networks have expanded the definition of what qualifies as an ATM.
Under these expanded guidelines, a terminal may be considered an ATM if it either contains its own cash vault or uses the cash vault or cash drawer available within a merchant’s premises.
This approach makes it possible to deploy scrip cash dispensers and other specialized cash-dispensing devices while still allowing them to operate within the financial network.
By broadening the types of devices that can connect to the network, financial institutions can increase the availability of cash withdrawal services in more locations.
Secure Communication
Security is one of the most important aspects of ATM networks. In addition to protecting customer information through authentication methods such as ATM cards and PIN verification, the communication between the ATM and the Transaction Processor is also protected.
All transaction data transmitted between the ATM and the processing system may be encrypted to prevent unauthorized access or interception during transmission.
One commonly used security technology for protecting this communication is Secure Sockets Layer (SSL) encryption. SSL encrypts the information exchanged over the communication network, helping to maintain the confidentiality, integrity, and security of financial transactions.
Security Features in ATM Financial Networks
| Security Feature | Purpose |
|---|---|
| Transaction Authorization | Verifies customer identity and approves or rejects transactions. |
| ISO 8583 Messaging | Standard protocol used for electronic financial transaction communication. |
| Data Encryption | Protects transaction information while it is transmitted over the network. |
| SSL (Secure Sockets Layer) | Encrypts communication between the ATM and the transaction processor to prevent unauthorized access. |