View of the device

Front view

TRO-4/400 is designed to power with DC voltage and receive video signals from four TRN-1/400 (video transformers/transmitters) M1668 via a twisted pair cable (UTP, FTP) over a distance up to 400 meters. The device is fed with AC 24-29V coming from an external AC power supply.

The camera signal sent to one of TRN-1/400 transmitters M1668 is re-sent to the TRO-4/400 receiver via a twisted pair. Both the transmitter and receiver adjust their impedance of 75 ohm coaxial cable to that of the outgoing TP cable, which allows the transmission of video signal over longer distances (400meters). The TRO-4/400 receiver feeds the twisted pair cable with unstable DC (max 40V) which is later stabilized at the level of 12V in the TRN-1/400 transmitter M1668. This allows simultaneous powering of 4 cameras equipped with heaters and thermostats. If one assumes that the power consumption of a camera equals 250mA/12V and that of a thermostat is 500mA/12V (TT-12E), then power can be sent with a standard 0.5 mm twisted pair cable (24AWG) over the following distances:

No.	Type of load	Max distance at AC29V	Max distance at AC24V
1.	4 cameras with thermostats	4 x 420m
2.	3 cameras with thermostats + one without	3x440m + 1x1200 m
3.	2 cameras with thermostats +2 without	2x480m + 2x1400 m	3x55m + 1x190m
4.	1 camera with thermostat +3 without	1x480m + 3x1500m	2x130m + 2x720m
5.	4 cameras without thermostats	4x1700m	4x720 m

For distances greater than 400m a video amplifier should be installed.

Name	TRO-4/400
Code	M1670
Video bandwidth	up to 50 MHz
Nominal video loss	0.5 dB (at f = 5 MHz)
Impedance of the coaxial outputs	75 ohm
Impedance of the symmetrical inputs	100 ohm
Types of connectors	4 x BNC sockets
Types of symmetrical cable connectors	4 x RJ-45 sockets (8 pin, 4 pairs)
Power input (max parameters)	29VAC / 2A
Max. output voltage	40VDC
Max. current (40VDC)	2A
Weight	100 g
Dimensions	117x64x30 mm

Connection diagram: the device with 4 cameras without thermostats