5 ms·
Oyster cards are settled between the reader and the card at the time of contact (then the reader will batch the transactions for forwarding later). POS are gene
by mianos 9y ago
Oyster cards are settled between the reader and the card at the time of contact (then the reader will batch the transactions for forwarding later). POS are generally settled on the switch network, obviously this takes a lot longer.
- Reason077 9y agoTfL can and do batch contactless transactions, too. The charge for travel on a given day is not made against your account until early the next morning. And card readers on buses, for example, don't always have a reliable data connection, so must be able to be processed offline. You might be right that they are authorising in real time on the Tube readers, though. This would explain the poor performance.