Siemens OCI600 - Communication Via the Telephone Network; Introduction

50/72
Building Technologies User Manual OCI600 74 319 0002 0 c
HVAC Products Communication and delivery of alarms 15.07.2005
5.3 Communication via the telephone
network
Topology of a plant with communication via modem and the
public telephone network.
5.3.1 Introduction
Modem technology affords remote supervision and remote
alerting.
Both receiver and transmitter of remote supervision and a-
larm receiver can be the ACS software installed on a PC with
modem connection facility. In this case, 2 modems are re-
quired: 1 at the central unit and 1 at the PC.
Alarm receivers can also be mobile phones, pagers and fax
machines. In that case, only 1 modem at the central unit is
needed.
Compared to a standard analog modem, an ISDN modem
does not increase the rate of transmission since this is lim-
ited by the central unit. If a telephone line cannot be laid, a
GSM modem can be used.