In the future, “heavy users” of Comcast’s broadband service may face not just a periodic slowing–sorry, deprioritizing–of their service, but a capping of that service as well. Broadband Reports brings word today that Comcast plans to implement a 250GB broadband cap come October. “The intent appears to be to go after the people who consistently download far more than the typical user, without hurting those who may have a really big month infrequently,” a source familiar with the plan told BroadBand Reports. Indeed it does. Certainly, 250GB is quite a bit higher than the 5-40 GB caps being considered by some other providers. Still, it’s not exactly the “unlimited” service Comcast has sometimes touted in its marketing materials.

So what happens should one hit Comcast’s cap or exceed it? Comcast (CMCSA) says first-time transgressions will be addressed with an “excessive use” call from Comcast’s Customer Security Assurance group. But hit the cap twice in six months and you’ll be looking for a new ISP. “If a customer surpasses 250 GBs and is one of the top users of the service for a second time within a six-month time frame, his or her service will be subject to termination for one year,” Comcast explains in its Excessive Use FAQ. “After the one-year period expires, the customer may resume service by subscribing to a service plan appropriate to his or her needs.”

Assuming he or she is still willing to give Comcast his or her business.