Signal Quality Error - Also know as heartbeat, a test between the transceiver/MAU and the DTE to ensure that the collision detection circuit in the transceiver/MAU is working. The heartbeat function must be disabled when a transceiver/MAU is attached to a repeater. If a transceiver/MAU, while transmitting, detects a collision, the transceiver/MAU sends the SQE signal to the repeater, or node, to which it is connected. Also see Heartbeat

signal quality error. Transmission sent by a transceiver back to the controller to let the controller know whether the collision circuitry is functional. Also called heartbeat.

Signal Quality Error. SQE is the IEEE term for collision. Also see collision.

Statute Quia Emptores (1290)

Special qualifying exams. Entrance exam normally taken when standard entry requirements are not quite met