form part of the invention and thus are not further described a control unit 210 causes switching fabric 202 to connect a particular line or member of a trunk group to another based on information contained in translations database 212 which associates an internal physical port address to a designation useful to the network such as a telephone number when interfacing to access systems a special line unit called an integrated digital terminal u201c idt u201d 214 can be used to interface directly with digital trunks 126 to communicate with and control remote terminal 122 an alternative approach is represented by the use of a central office terminal 216 to convert a plurality of subscriber lines originating on line unit 206 into a multiplexed digital signal carried by digital trunk 128 that communicates to the remote terminal 124 one skilled in the art will appreciate that the control signals embedded in trunks 126 and 128 must provide similar services and may in fact be identical regardless of the methodology e g integrated digital terminal 214 or central office terminal 216 used to interface to switch 102 these cases illustrate that the subscriber lines deployed using access systems do not differ significantly from those supported directly from switch line units in that they rely on the local switch for dialed digit collection switching translation and other services as is standard in the art control unit 210 of local switch 102 controls all remote terminals herein 122 and 124 thus when a telephone such as telephone 114 goes.