Control Office Equipment

As per RDSO Specn. IRS:TC-60/2007

Control Office Equipment

The train traffic control equipment with DTMF Voice Frequency signaling is used in omnibus speech circuits like section control, TPC control, Deputy Control etc. used in Railways. This equipment can run both, in 2 wire or 4 wire control circuits. DTMF signaling uses two standard tones in voice frequency band for selectively calling the way side stations. DTMF tones as per CCITT standard is used for generation of signaling code which is in VF band and thus in-band signaling is used. This code is generated simply by operation of 2 keys on the control console.

TECHNICAL SPECIFICATIONS:

Maximum No. of station code 2-digit code	99 [01 to 99]
Group Code	4 Group Codes, (AA, BB, CC, DD)
General Code	All the Stations Called at the. Same time by pressing GG.
To Repeat a Code	The last transmitted code can be repeated by pressing push button Switch “RT”
Long Ring	The ringing period at the way side station can be extended for longer duration by pressing pushes button Switch “LR”
Display of transmitted code	Provided with Red seven segment displays and which reads till next code is transmitted.
Resetting the system	The system shall be reset by pressing push button switch “RS”.
To Delete a Code	Code shall be cancelled by pressing a single push button switch “DL”
Row/Column Frequency	Can be checked by pressing push button “RC”. R1 : 697 Hz. R2 : 770 Hz. R3 : 852 Hz. R4 : 941 Hz. C1 : 1209 Hz. C2 : 1336 Hz. C3 : 1477 Hz. C4 : 1633 Hz
Code Output setting	Adjustable from 0dBm to -7dBm.
Duration of Code transmission	500 msec
Accessories Supplied	Hand set, Mike, Speaker