16
restore, the switch decides that the camera is hanging and restarts it. The user
may specify the limit values (see the Configuration Manual).
3.8.2 Cable tester
The switch can function as a virtual cable tester (VCT), which allows to
determine the breakage of the twisted pair, short-circuiting of the twisted pair
wires, cable disconnection from the camera, distance from the switch to the
fault. The cable tester is used to test pairs that transmit data (
1, 2
and
3, 6
).
Note that the accuracy of the cable tester is
± 2 meters
.
By default, VCT operates on an average algorithm and does not take into
account the specific features of a particular cable, which can affect the accuracy
of the measurement. To improve the accuracy of the cable tester, it is
recommended to calibrate it. Note that calibration is not recommended for
cables
shorter than 10 meters
.
3.8.3 Remote camera polling
Using the switch, it is possible to ping any device on the network through the
web interface, which is convenient when solving network problems.
4 Technical specifications
Gigabit Ethernet ports
•
1000Base-X with SFP connector;
•
Number of ports
– 2;
Fast Ethernet ports
•
10/100Base-Tx with RJ-45 connector;
•
number of ports
– 4;
•
Auto-MDIX support for 10/100Base-Tx port;
•
IEEE 802.3x flow control support;
•
PoE/PoE+ (IEEE802.3af/at) support by option A and B simultaneously
–
up to 60W;
•
total power should not exceed 160 W;
•
transmission distance
– up to 100 m.
Power supply
•
voltage
– 230 VAC (187 to 253 V);
