A common form of attack on alarm panels is cutting its telephone line connection to the telephone company exchange.
A central GSM server operates at the CMS and monitors the status of all installed terminals simultaneously.
The terminal can be integrated with standard alarm panels and offers protection from telephone line-cut attacks.
The system has the capability and option of periodic security polling via SMS, instead of the usual telephone line. Transmission Medium RedundancyGIDACS transmits alarm signals through the GSM network simultaneously as the alarm panel sends similar alarm signals through the telephone network.
Additional AlarmsGIDACS transmits alarm information via SMS whenever the telephone line is cut, the terminal is tampered, and whenever there is an AC power failure or back-up battery power failure.
Programmability GIDACS can be programmed to send alarm signals to the CMS, to proper authorities, even to personal cellphones to ensure quick action to an alarm. The communication network of an electric power system has the important role of conveying information for ensuring a stable supply of electricity.
BLOCK DIAGRAM OF SATELLITE COMMUNICATION SYSTEM PPTTo run satellites housekeeping and communication block diagram.
Mobile satellite communication is rendered from the radio station (earth station) installed in ground or maritime mobile entities (automobile, vessel, aircraft, etc.) to the other radio station (earth station) via the artificial satellite.
Based on the orbit of the satellite, it communicates by either the geostationary satellite, the quasi-zenith satellite, or the non-geostationary satellite. The geostationary satellite is the artificial satellite which looks stationary from the ground.
The quasi-zenith satellite is an artificial satellite of the satellite system where one satellite always stays near the zenith in Japan by positioning at least three satellites synchronously on the orbit inclined at 45 degrees from the geostationary orbit.

This is roughly divided into three kinds of orbits: highly elliptic orbit, medium earth orbit, and low earth orbit.
Copyright(C)Telecommunications Bureau of the Ministry of Internal Affairs and Communications All Rights Reserved. Once the connection is cut, the alarm panel cannot send emergency signals via the telephone to the Central Monitoring Station.
In the Philippines, telephone lines from banks and establishments connect to posts above ground, which makes it easy for robbers to cut the phone line from outside the establishment, before breaking in.
In case there is a fault in the GSM network or GSM terminal, the terminal triggers the alarm panel to communicate via the telephone line of the fault. Once the system is installed, an option of polling via SMS or telephone line can be selected. It is a fraction of a cost as compared to installing new alarm panels with built-in SMS communicators.
Alarm signals will still be able to reach the CMS even if one medium is down due to tampering or network failure. The system hooks up to the battery of the alarm panel and has its own secondary back-up battery in case the alarm panel battery fails. This information is used to adjust output from power stations, and to prevent power outages from spreading to wider areas when they occur. Among the main facilities are microwave wireless communication systems using extremely short wavelengths, and an optical fiber communication network, sending information over laser beams. As the ground surface orbit draws the shape of number 8, it's also called "Number 8 Orbit Satellite". The medium and low earth orbits have lower satellite altitudes to shorten the radio transmission delay, enabling more speedy and smooth communication.

With the integration of the wireless terminal to standard alarm panels, communication of alarm signals can be simultaneously through the GSM and the regular telephone line network, providing redundancy for increased reliability and security.
For Metro Manila establishments, polling through the telephone line can be selected to remove the overhead of periodic SMS delivery costs.
It can be quickly integrated to any installed alarm panel and is robust against any form of tampering and signal jamming from outdoors. Whenever the GIDACS terminal is being jammed or if the GSM network is down, GIDACS triggers the alarm panel to send ‘GSM failure’ zone alarm through the telephone line. Through telephone line cut and AC power failure detection, CMS is immediately informed of possible burglary attacks. Regular alarm system polling can also be done via SMS rather than long-distance calls, resulting in significant cost savings of several hundred pesos per month per branch. In addition, optical ground wire (OPGW, cable containing optical fiber) is used on the overhead ground wire of transmission routes for protection from lightning.
Also, mobile satellite communication is notably recognized as a relatively powerful measure against disasters.
Most of the artificial satellites actually used for communications or broadcasting are geostationary satellites. The terminal sends emergency signals via Short Message Service (SMS) when the alarm is triggered, the telephone line is cut, or if there is an AC power failure.
Because communication is via SMS messages, the system is immune against line-cut attacks thereby considerably strengthening the reliability of Alarm Signal Communication.

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