Subscriber station (10; 30) for a serial bus system, having a communication control device (11; 31) for controlling a communication between the subscriber station (10; 20; 30) and at least one other subscriber station (10; 20; 30) of the bus system and for evaluating a signal (VDIFF), received from a bus of the bus system, for which the bit time (t_bt1) in a first communication phase can differ from a bit time (t_bt2) in a second communication phase, wherein the communication control device (11; 31) is configured to sample and evaluate the signal (VDIFF) received from the bus, which is based on a transmission signal (TxD_TC) generated by another subscriber station (10; 20; 30), according to a predetermined frame (450; 450A) that has a first predetermined field, which indicates a transition from the first communication phase to the second communication phase, and, after the second communication phase, a second predetermined field (1520; 1521), which uses bits having the bit time (t_bt1) of the first communication phase to indicate a transition from the second communication phase to the first communication phase, wherein the second predetermined field (1520; 1521), between the start and the subsequent falling edge of the second predetermined field (1520; 1521), has two or three bits having the logic value 1, wherein the communication control device (11; 31) is configured to rate a frame that the communication control device (11; 31) has sampled from the signal (VDIFF) received from the bus as a predetermined frame (450; 450A), and therefore as valid with respect to the second predetermined field (1520; 1521), irrespective of whether only one bit or two consecutive bits having the logic value 1 were sampled in the signal (VDIFF) received from the bus between the start of the second predetermined field (1520; 1521) and the subsequent falling edge, and wherein the communication control device (11; 31) is configured to perform a synchronization at the falling edge of the second predetermined field (1520; 1521). a communication control device (11; 31) for controlling a communication between the subscriber station (10; 20; 30) and at least one other subscriber station (10; 20; 30) of the bus system and for evaluating a signal (VDIFF), received from a bus of the bus system, for which the bit time (t_bt1) in a first communication phase can differ from a bit time (t_bt2) in a second communication phase, wherein the communication control device (11; 31) is configured to sample and evaluate the signal (VDIFF) received from the bus, which is based on a transmission signal (TxD_TC) generated by another subscriber station (10; 20; 30), according to a predetermined frame (450; 450A) that has a first predetermined field, which indicates a transition from the first communication phase to the second communication phase, and, after the second communication phase, a second predetermined field (1520; 1521), which uses bits having the bit time (t_bt1) of the first communication phase to indicate a transition from the second communication phase to the first communication phase, wherein the second predetermined field (1520; 1521), between the start and the subsequent falling edge of the second predetermined field (1520; 1521), has two or three bits having the logic value 1, wherein the communication control device (11; 31) is configured to rate a frame that the communication control device (11; 31) has sampled from the signal (VDIFF) received from the bus as a predetermined frame (450; 450A), and therefore as valid with respect to the second predetermined field (1520; 1521), irrespective of whether only one bit or two consecutive bits having the logic value 1 were sampled in the signal (VDIFF) received from the bus between the start of the second predetermined field (1520; 1521) and the subsequent falling edge, and wherein the communication control device (11; 31) is configured to perform a synchronization at the falling edge of the second predetermined field (1520; 1521).