GradeShift Pro2 4G+4G is a dual-path GPRS unit that uses two active 4G WorldSIMs, each with its own radio module and aerial, one as the primary path and one as the secondary path. A third standby SIM acts as a backup to the primary SIM on the primary path.

If you currently have a Dualcom GradeShift GPRS+PSTN unit and want to retain dual-path signalling once you lose your analogue telephone line (due to the nationwide upgrade to Digital/All IP) then this 4G+4G unit is the recommended replacement. It is available in Grades DP2, DP2+ and DP3. The main difference between the grades is the polling time for a situation whereby both signalling paths fail, either simultaneously or if one failed and then sometime later the second one failed.

With DP2 keyholders would be notified within 31 minutes, DP2+ in 11 minutes and with DP3 within 4 minutes. It would be rare for both paths to fail but these notifications are important for sites at risk. If intruders were able to sabotage the signalling then you would want to know as soon as possible. If there was a network fault and one path was down, you would want to know if the second path failed because you may wish to put in place additional security until the signalling is restored. Standard activation signals (such as Intruder, Panic, Fire, Faults) are received by the Alarm Receiving Centre within a couple of seconds regardless of the Grade of signalling as long as at least one path is functioning.

CSL, the company behind the GradeShift Pro2, is the leading alarm signalling provider in the UK. Their patented roaming WorldSIM will lock on to the strongest network of Vodaphone, EE and O2. This means that if one network goes down your alarm system should still be able to communicate.

The key points are:

• Uses the cellular 4G GPRS network so does not need a conventional telephone line
• Eliminates all call charges – no additional costs for signalling the ARC
• Unaffected by Next Generation Networks – no costly “runaway” signals
• Perfect for sites that have changed telephone provider and disconnected the telephone socket that the alarm is connected to
• Uses CSL’s WorldSIM for network resilience – locks onto the strongest network
• Has a dormant back-up SIM for added resilience in case the primary SIM fails
• Fits inside most control panels