A brake control apparatus includes a master cylinder, wheel cylinders provided for each vehicle wheel, first and second hydraulic actuators provided separately from the master cylinder and adjusting a hydraulic pressure of the wheel cylinder. A force transmission path from the adjustment device to the optical assembly is formed at least partially by a multitude of force transmission elements arranged abutting on one another in a force transmission channel. 4 communication system, a high-speed data frame structure is provided which uses the 802.