The antenna of cell phone jammer can not beinstalled in the reverse direction

Cell phone to complete the registration on the SDCCH. In Slow Associated Control Channel (SACCH) on the issue control instructions. And then cell phone to idle, and monitor control channel BCCH and CCCH information on the public. At this point do the paging cell phone preparation. Users to monitor BCCH must be made with a similar base station synchronization. By receiving the FCCH, SCH, BCCH information, the user will be locked into the system and appropriate on the BCCH. We consider the GSM system in the case of a call by the cell phone. First, the user in monitoring BCCH must be made with a similar base station synchronization. The cell phone will appear situations of net searching, no-signal, no-service system and so on ifcell phone jammer is used.
By receiving the FCCH, SCH, BCCH information, the user will be locked into the system and appropriate on the BCCH. To place a call, users must first dial, and press the launch button on the GSM cell phone. Locking its cell phone base station system ARFCN to transmit RACH data burst sequence. On CCCH and the base station to the AGC information to respond to, CCCH for the cell phone to specify a new channel for SDCCH connection. BCCH in TS0 is monitoring the user, it received from the AGCH ARFCN and TS arrangements, and immediately go to the new ARFCN and TS, and this new ARFCN and TS distribution is SDCCH (not TCH). 3G signal is also shielded bycell phone jammer.
Once transferred to SDCCH, the user first passed its SACCH frame waiting (waiting for the maximum sustained 26 or 129ms). The frame message to the cell phone asks for the amount of timing advance and transmit power. RACH according to cell phone base station before transmitting data to determine the appropriate amount of timing advance and power level, and sends the appropriate data through the SACCH for mobile processing. SACCH is received and processed in the amount of timing advance information, the user can send a normal voice services required by the unexpected sequence information. When connected to the PSTN from dial-MSC, and MSC will be the voice path to access the base station, SDCCH check the legality and validity of the user, then the messages sent between cell phones and base stations. cell phone jammer only shields downward frequency of base station.
After a few seconds, this cell phone base station re-turned by a SDCCH to TCH ARFCN arrangements and TS. Once again received TCH, the voice signal on the forward and reverse link transmission, the call successfully established, SDCCH be vacated. When a call from the PSTN when the process is similar to the process. Base station in the appropriate frame of TS0 BCCH during a PCH message is broadcast. Lock on the same ARFCN detect it on the cell phone paging, and respond to a RACH message to confirm receipt of paging. When the network connection and service base, the base station on the AGCH CCCH cell phone assigned to a new physical channel to connect SDCCH and SACCH. cell phone jammer has no harm to the human health.
Once established on the SDCCH, and allowed to confirm the amount of time in advance, the base station on the SDCCH channel re-allocation of physical, but also established the allocation of TCH. Off, press the key to open the keyboard to digital detection module sends a shutdown request to the logical part of the signal, CPU power is withdrawn to maintain the signal, shutdown procedures, withdrawal of power supply modules, RF and logic circuits that stop working, so shut down. If turned on, forced off (remove the battery) may cause internal software fault. It also includes other software workflow processes such as charging, the battery detection, keyboard scan, test processes. cell phone jammer has the slow-starting circuit design.