SR OS on the 7750 SR platform has support for volume accounting and time-based accounting concepts, and provides an extra level of intelligence at the network element level to provide service models such as ‟prepaid access” in a scalable manner. This means that the network element gathers and stores per-subscriber accounting information and compares it with ‟pre-defined” quotas. When a quota is exceeded, the pre-defined action (such as re-direction to a web portal or disconnect) is applied.