This computer serves to assign priorities, buffer, manage and pass on messages to the trans- mitter. The areal is fixed on the receiver but can also be in- stalled separately, if the location poses problems. The receiver has a program memory to store repetitive control functions. This means that only program changes have to be transmitted. Modern LW teleswitch can fulfill the same tasks as conventional ripple control.
Reaction time is a few seconds.
Each telegram is transmitted asynchronous at 200 Baud and 340 Hz shift, using 8 data bits plus even parity bit. This is followed by the C field, the A field and the CI field. Maybe it is used as an address extension. Most often, however, it is identical to the A field. The user data field is followed by the check sum, which is the least significant byte of the arithmetical sum of C, A, CI and the user bytes.