Yes, you may purchase your own modem from the list of TWC tested and approved modems, located here. If you choose to purchase your own modem, the monthly Internet Modem Lease charge will be waived.
If you choose to purchase your own modem from the TWC tested and approved list, you can be confident that the equipment will support the current features and speeds provided as part of your Internet package. Keep in mind that one of the risks associated with purchasing your own modem is that it may become obsolete and/or unable to support new features or speeds that may be introduced in the future.