Type Of Cable - Videotec TWM1 Manuel D'instructions

8 Type of cable

The type of cable to be used is a Cat. 5 UTP (Unshielded Twisted Pair) (defined according to TIA/EIA
568A and ISO/IEC 11801 standards). Using this cable it is possible to cover long distances (see Tab.2) and it is
possible to pass more than one video or telemetry signal along the same cable.
It is also possible to increase the distances using intermediate pairs of transmitters and receivers. In this case
we recommend not exceeding ¾ of the maximum distance for the individual sector and using at the most one
intermediate pair so as not to excessively impair the quality of the video signal.
The device also operates with other types of UTP cable (Cat. 2 or above - 18/24 AWG – 100 ± 20 Ohm). The
performance and the quality of the video signal depend on the cable itself and on its location.
Impedance (1-100 MHz)
100 ± 15 ohm
Tab.1 Cat.5 – 100 Ohm UTP cable characteristics
Meaning of the terms:
Attenuation: represents the decrease in amplitude of a signal travelling along a conductor
N.E.X.T. : Near-End Xtalk (Crosstalk), indicates how much one signal interferes with another
AWG: American Wire Gauge, American system for measuring cable diameter.
Maximum performance with 4x2x24AWG Cat.5 – 100 Ohm UTP cable
1 VIDEO SIGNAL
4 VIDEO SIGNALS
Tab. 2 Maximum performance
Maximum performance with UTP 4x2x24AWG Cat.5 – 100 Ohm cable
1 VIDEO SIGNAL
4 VIDEO SIGNAL
Maximum performance with UTP 4x2x24AWG Cat.5 – 100 Ohm cable
Transmitter TWP, receiver and TWRR1/TWRB1/TWRB1A
1 VIDEO SIGNAL
4 VIDEO SIGNAL
Main characteristics of a Cat. 5 – 100 Ohm - 24 AWG cable at 20 °C
Attenuation (max.)
21 dB/km @ 1 MHz
43 dB/km @ 4 MHz
65 dB/km @10 MHz
COLOUR
1500m
1500m
Transmitter TWP, receiver TWP
COLOUR
350m
350m
COLOUR
750m
750m
N.E.X.T. (min)
62 dB/km @ 1 MHz
53 dB/km @ 4 MHz
47 dB/km @ 10 MHz
B/W
2000m
1500m
B/W
600m
600m
B/W
1250m
1250m
Pag. 7
Loop resistance (max.) Insulation
192 ohm/km
MNVCTW_0610
PE