projects under execution
UFSBI with Secured Modified Digital Microwave Radio
Connectivity solution of UFSBI & AXEL COUNTER OVER Secured Radio Links is being implemented in Bilaspur and Guwahati sections of Indian Railways through, M/s Technocomm & M/s in cooperation with UFSBI manufacturer M/s Deltron, Kolkata .
In certain situations in Indian Railways, a suitable optical / cable / Railway owned permanent microwave infrastructure is not available for carrying Block information / safety information. UFSBI with secured Modified Digital Microwave Radio is being implemented
The Block Instrument is connected to the fail-safe multiplexer - UFSBI using signalling or PIJF cable, so that DC and FM signals are exchanged between them reliably. The UFSBI is subsequently connected to the communication media, i.e. Microwave Radio directly through RS232C data port DB9 connector (@ 2.4 Kbps)
For instance, when a bell plunger of the SGE DLBI or Diodo TLBI is pressed the DC signal generated from the Block Instrument, is used to energize an input relay at one end, which is transmitted to the other end through the communication media via modem to the other end, and subsequently picks up an output relay. The output relay is used to commutate the local DC supply to the receiving end Block Instrument, as if it is connected to the other machine using copper cable and thereby completes the DC current loop.
In order to perform the inter-station voice communication the Radio provides an Ethernet port. A VOIP adaptor is used to interface between the conventional E&M phones used in railways and the IP port of radio, thus providing toll quality secured voice communication.
The radio solution can also be used for the following applications:
1. Single Section Single Line Digital Axle Counter (SSDAC) Operation on Radio Link
The Radio and DAC-RS232 are kept in Station premises. The Digital Axle Counter is connected to the DAC-RS232 through Quad Cable. The DAC-RS232 is subsequently connected to the communication media, i.e. Radio, directly through RS232C data port DB9 connector.
2. Single Section Single Line Digital Axle Counter (SSDAC) Operation on Radio Link & Quad Cable with Automatic Media Switch over facility
In case Quad cable interface is available in this section, the DAC-RS232 can be connected to Quad cable as well and the system will have two communication links – Quad Cable and Radio with Automatic Media Changeover facility. If one communication media fails, the Media Changeover unit will automatically switch over to the other media. Hence, Communication Redundancy can also be achieved.
3. Single Section Digital Axle Counter (SSDAC) Operation on Double Line over Radio Link
The Radio has two RS 232 serial communication port for necessary interfacing with Axle counter. Availability of inbuilt multiple RS 232 serial interfaces make this radio system suitable for double line Axle Counter application. In this application, two DAC-RS232 is required at each station end. Each one is connected with an Axle counter through quad cable. Both the DAC-RS232 are connected with the Radio through RS 232 Interface.
4. Single Section Double Line Digital Axle Counter Operation on Radio Link & Quad Cable with Auto Switch-over
In case Quad Cables are available in this section, communication redundancy can be achieved in Double Line as well. In this application, Four DAC-RS232 is required at each station end. Two of them are connected with two track side Axle counters through quad cable. These two DAC-RS232 are connected with the Radio through RS 232 Interface. The other Two DAC-RS232 are connected to two quad cables. The RS 232 interface of these two DAC-RS232 and RS 232 Data output of the Radio are connected to the Automatic Media Changeover Facility.
If one communication media fails, the Media Changeover unit will automatically switch over to the other media. Hence, Communication Redundancy can also be achieved in single section double Line environment.