Service Access Controller - significado y definición. Qué es Service Access Controller
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Qué (quién) es Service Access Controller - definición

METHOD OF TRANSFERRING DATA THAT MUST NOT BE INTERRUPTED (TELECOMMUNICATIONS)
Isonchronous media access controller

disk controller         
CONTROLLER FOR DISK STORAGE, USUALLY INTEGRATED INTO THE DRIVE
Hard disk controller; Hard drive controller; HD controller; Drive controller
<hardware, storage> (Or "hard disk controller", HDC) The circuit which allows the CPU to communicate with a {hard disk}, floppy disk or other kind of disk drive. The most common disk controllers in use are IDE and SCSI controllers. Most home personal computers use IDE controllers. High end PCs, workstations and network {file servers} mostly have SCSI adaptors. (1998-03-16)
Disk controller         
CONTROLLER FOR DISK STORAGE, USUALLY INTEGRATED INTO THE DRIVE
Hard disk controller; Hard drive controller; HD controller; Drive controller
The disk controller is the controller circuit which enables the CPU to communicate with a hard disk, floppy disk or other kind of disk drive. It also provides an interface between the disk drive and the bus connecting it to the rest of the system.
Terminal Access Controller         
Terminal Access Controller
<hardware, networking> (TAC) A device which connects terminals to the Internet, usually using dial-up modem connections and the TACACS protocol. (1997-11-27)

Wikipedia

Isochronous media access controller

Isochronous media access controller (I-MAC) is a media access control whereby data must be transferred isochronously—in other words, the data must be transmitted at a steady rate, without interruption.