Bosch Appliances ICP-CC488 manual Appendices, Appendix a Telephone Anti Jamming

ICP-CC488 Installation Guide 23.0 Appendices

EN 99

23.0Appendices

23.1Appendix A – Telephone Anti-

Jamming

There are many companies that import American- designed products claiming to have anti-jamming, and they push this feature as if it were a major breakthrough in control panel technology. This is not the case because most control panels have some sort of anti-jamming feature. We can go back to the early 1980s where even the 678 Dialers incorporated a form of anti-jamming as a standard programmable option.

The important thing to note is that most American- designed products are primarily aimed at their local market and telephone networks. When these products are imported to Australia, their anti-jamming functions do not perform as they should.

To clear up what anti-jamming is and how it works needs some understanding of telephone networks. In America either of the two parties (that is, the one who initiated the call or the one receiving the call) can clear the line by placing the hand piece back on the hook. If you pick up the hand piece again, a dial tone is received and you can make a new call immediately. That is not so here in Australia.

In Australia, only the calling party can terminate the call immediately. If you receive a call from someone and hang up, picking the hand piece back up again to make a new call only reconnects you to the original caller. It is impossible to make another call until the original caller hangs up or you hang up the phone for ninety sec or longer. Australia is different and needs a special form of anti-jamming its our telephone network.

There are control panels on the market that, after making a few unsuccessful call attempts, simply hang up and wait for ninety sec in an attempt to clear the jamming incoming call. This may work in some instances where the caller is not a burglar and is not deliberately trying to jam the control panel. With this simple method of hanging up for ninety sec, not only is the alarm signal delayed for this time, but also the time taken for the original failed call attempts (these could easily total 4 min). This is bad enough, but even more disturbing is that the initial failed call attempts allow for the establishment of an audio connection between the would-be burglar and the control panel. Anyone with a little knowledge of alarm systems can trick the dialer that it is communicating to a base station and clear the alarm signal. It is pretty frightening when the control panel you use and recommend to your customers is supposed to have anti-jamming.

At Bosch Security Systems, Inc., we take anti- jamming very seriously and have devoted a great deal of time and money researching this problem. Our engineers have designed the best possible anti- jamming procedure known and patented it accordingly (Patent Number 571994).

Our procedure is very simple and effective because we never answer the burglar’s phone call and the Telecom Network automatically clears an unanswered call in approximately 90 sec. This time is shorter if the call is originated through the Mobile- Net Network where it will most likely be in the case of a true burglary.

When the control panel detects that the phone line has stopped ringing, it immediately loops the line and makes its call, thereby transmitting its alarm message successfully. The line is also automatically disconnected from the telephones within the protected premises immediately on an alarm condition by the control panel to further confuse the burglar and eliminate the possibility of the burglar answering the call. In the worst possible case, our method of anti-jamming delays the alarm signal by ninety sec, but even more importantly never allows an audio connection between the burglar and the control panel.

All dialing products produced by Bosch Security Systems, Inc. since 1985 incorporate this true anti- jamming feature as standard. We do not consider it an option but a must in any professional security system.

Only Bosch Security Systems, Inc. products have true anti-jamming. Other manufacturers can offer only second best because of our patent for this very unique and effective procedure.

23.2Appendix B – Test Reports Only When Armed

The ICP-CC488 Control Panel allows Test Reports to be sent to the base station receiver to verify that the dialer is functional. Most alarm dialers allow you to do this.

The one problem is that installations that send Opening and Closing Reports generally also send a Test Report each day. This call is unnecessary because a successful Opening and Closing Report means that the dialer is functioning correctly.

The ICP-CC488 Control Panel allows you to save time and money by providing Test Reports only when the system is armed.

Bosch Security Systems, Inc. 12/08 F01U089457-02