ATS levels and attenuation specifications

ATS (Alarm Transmission System) Levels

The following table lists the ATS levels required for the panel when communicating over:

• GSM to Alarm Reporting Centre (ARC)

• PSTN to Alarm Reporting Centre (ARC)

• Ethernet to SPC Comm receiver software

• GPRS to SPC Comm receiver software

	GSM ARC	PSTN ARC	Ethernet	GPRS
ATS Level	ATS 2	ATS 2	ATS 6	ATS 5

Attenuation of PSTN

For a PSTN dialer, a CW1308 Internal Telecom or equivalent cable should be used to connect the modem to the phone line. The cable length should be between 0.5–100m.

Attenuation of Ethernet

For Ethernet, a Cat 5 cable should be used with its length between 0.5–100m.

Attenuation of GSM

The field strength of the GSM signal needs to at least -95dB. Below this level the modem will flag a low signal fault to the panel. This is handled in the same way as other faults on the system.

Monitoring and watchdog of PSTN (SPCN110) and GSM (SPCN320)

A failure of the interface between the PSTN modem and the panel will be detected after 30 seconds, after which an ATS fault will occur.

A failure of the interface between the GSM modem and the panel will be detected after 30 seconds, after which an ATS fault will occur.