H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
H04Q9/04—Arrangements for synchronous operation
B—PERFORMING OPERATIONS; TRANSPORTING
B61—RAILWAYS
B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
B61L7/00—Remote control of local operating means for points, signals, or track-mounted scotch-blocks
B61L7/06—Remote control of local operating means for points, signals, or track-mounted scotch-blocks using electrical transmission
B61L7/08—Circuitry
Landscapes
Engineering & Computer Science
(AREA)
Computer Networks & Wireless Communication
(AREA)
Mechanical Engineering
(AREA)
Selective Calling Equipment
(AREA)
Remote Monitoring And Control Of Power-Distribution Networks
(AREA)