tc - Computer Definition
In the ATM reference model, a Physical Layer sublayer that handles frame generation, frame adaption, cell delineation, header error control (HEC), and cell rate decoupling. The frame generation function receives the frame of data presented by the transmitting device across the Physical Medium (PM) sublayer for presentation to the ATM Layer and subsequent segmentation into cells. On the receive side, the TC sublayer receives data in cells and decouples it to reconstitute the frame of data, checking for header errors before presenting the data to the PM sublayer, which passes the data to the end-user device. See also ATM, ATM Layer, ATM reference model, cell, frame, HEC, Physical Layer, and PM.
- A pin on a serial interface that pulses to indicate each bit time when the receiver should sample the data circuit to read a bit value.
- A clock that resides in a transmitter and provides a clocking source on which both the transmitting and the receiving data communications equipment (DCE) can synchronize. A TC embedded in a transmitting modem, for example, provides a clocking pulse on which both the transmitting modem and receiving modem can synchronize in order to distinguish between blocks of data. See also DCE, modem, and synchronous.