About Lightweight and portable payment system:

• The RBI has conceptualized this system which it is calling a bunker which is an equivalent of digital payments that can be operated from anywhere by a bare minimum staff in exigencies such as natural calamities or war.
• It is expected to operate on minimalistic hardware and software and would be made active only on a need basis.
• The infrastructure for this system will be independent of the technologies that underlie the existing systems of payments such as UPI, NEFT, and RTGS.
• The system is expected to process transactions that are critical to ensure the stability of the economy, including government and market-related transactions.
• The existing conventional payment systems such as RTGS, NEFT, and UPI are designed to handle large volumes of transactions while ensuring sustained availability.
• As a result, they are dependent on complex wired networks backed by advanced IT infrastructure.

What is NEFT?

• The National Electronic Funds Transfer is an electronic method of transferring money online.
• It enables transferring funds from the account maintained with any bank to any other bank branch, provided the transaction is attempted between the banks that participate in the NEFT payment system.
• The payments made via NEFT are processed and settled half hourly batches and transactions can be performed 24*7.
• Minimum Transfer Value: Rs. 1
• Maximum transfer value: No limit
• Money transfer made through NEFT does not require any additional transaction costs.

What is RTGS?

• It stands for Real-time Gross Settlement, which is a payment mode where the money is transferred from one bank account to the other in real time, without any delay. 
• It is mostly used for transactions of high value.
• When using the banking method, RTGS is the fastest possible way to transfer money.
• Transactions made through RTGS are processed on a one-to-one basis and transactions can be performed 24*7.
• Minimum Transfer Value: 2 lakh
• Maximum transfer value: No upper limit is there, but can vary between banks.