Fig 2
4
Site Survey
It is strongly recommended that a site survey is conducted prior to in-
stallation of a DualCom GPRS to confirm that adequate GPRS signal
strength is available at the site.
Before visiting the site, call CSL Technical Support. See page 9. Ask for a
GPRS signal strength prediction. For this, you will need to have the Post Code
of the site available. This will tell you if there is GPRS radio coverage at the
proposed site.
DualCom GSM is supplied with a Vodafone UK GPRS SIM Card which
can only be used in UK on the Vodafone UK GSM and GPRS networks.
If there is no GSM radio coverage at the proposed site, the DualCom’s GSM
and GSM radio alarm reporting paths will
not
operate.
Use of the CS2366 GSM/GPRS Radio Test Set is recommended to survey the
proposed site for GSM/GPRS signal strength and to locate the point of strong-
est signal. See Aerial Siting on Page 10 for more information. Make a note of
this point and use it when installing the Dualcom aerial.
Red & Green Signal
Strength LEDs
Socket for
Expansion units
Reset Pins
Test Pins
12 volt power
connections
NVM socket
8 input terminals
Aux relay
terminals
Fault relay
terminals
PSTN Line
A & B terminals
A1 & B1
terminals
Positive (pull-up) and
0volt source for input
triggering
Status LED
