For telephone local exchange carriers (LEC), "triple play" is delivered using a combination of optical fiber and digital subscriber line (DSL) technologies (called fiber in the loop) to its residential base. This configuration uses fiber communications to reach distant locations and uses DSL over an existing POTS twisted pair cable as last mile access to the subscriber's home. Cable television operators use a similar architecture called hybrid fibre coaxial (HFC) to provide subscriber homes with broadband, but use the available coaxial cable rather than a twisted pair for the last mile transmission standard. Subscriber homes can be in a residential environment, multi-dwelling units, or even in business offices.