TTY stands for teletypewriter and it is the term preferred by the Deaf Community. You may also see the terms TT (Text Telephone) or TDD (Telecommunication Device for the Deaf); they all refer to the same equipment.
Customer premises equipment (CPE) is telephone or other service provider equipment that is located on the customer's premises (physical location) rather than on the provider's premises or in between. Telephone handsets, cable TV set-top boxes, and Digital Subscriber Line routers are examples. Historically, this term referred to equipment placed at the customer's end of the telephone line and usually owned by the telephone company. Today, almost any end-user equipment can be called customer premise equipment and it can be owned by the customer or by the provider.
The CPEs are a funding mechanism in which public agencies (in California, primarily counties and the University of California [UC] system) certify that they have made expenditures eligible for FFP, and then are reimbursed by the federal government for part of these expenditures, generally at the stateâs FMAP rate.