SmarTek Systems SAS-1 Operating Modes and Architecture - Manual (Page 6)

SmarTek Systems (www.smarteksys.com) 6
multiple SAS-1 units communicating to the same base radio at the cabinet controller/data
concentrator, each SAS-1 is set up with a different SAS ID and set to wait to be polled. Multiple
radio networks may also operate in the vicinity of one another without interference since the
radio modems can be set to different network numbers or spectrum hopping patterns.
SAS-1 Wireless Link to Control Center via Internet/CDPD Modems
For SAS-1 stations with no means of hard wired communications back to a local controller
cabinet or to a central control center, CDPD modems and digital wireless service may be
employed as shown in Figure 3. The connection between the control center and the SAS-1
monitoring station is uniquely made using TCP/IP protocol and IP addresses. This architecture
also supports multiple SAS-1 units (each with a different SAS ID) connected to a single CDPD
modem so long as they are set up to be polled.
SAS-1 Link to Control Center via Traffic Management System Network
For Traffic Management Systems with a dedicated hard wired, fiber communications, or
wireless network connecting the SAS-1 station and the central control center, network device
servers may be employed as shown in Figure 4. The connection between the control center and
the SAS-1 monitoring station is uniquely made using TCP/IP protocol and IP addresses. This
architecture also supports multiple SAS-1 units (each with a different SAS ID) connected to a
single network device server so long as they are set up to be polled.
Figure 3 SAS-1 Wireless Link to Central Control Center
Multiple
SAS-1s
SAS-JB
Internet Connection
Data Collector
Computer
Central Control Center
Roadside
Structure
Solar/Battery
Cabinet
Digital Wireless Service
Provider Network
SAS-CT
CDPD
Modem