Specifications

Niagara Release 2.3
Revised: May 22, 2002 Niagara Networking & Connectivity Guide
Chapter 4 Connecting with Direct Dial
Niagara Considerations
4–2
System Architectures
Figure 4-1 and Figure 4-2 provide examples of typical Niagara job configurations
(system architectures) for connecting Niagara hosts through direct dial.
In the scenario presented in Figure 4-1, ABC Company has added two additional
JACE-4/5s to remote sites (see the “System Architectures” section on page 3-1 for a
description of the first two sites). These remote sites do not have a LAN and do not
have a connection to site 1 with a private leased line like site 2 does. Instead, direct
dial has been set up on both the Web Supervisor (at site 1) and the JACEs (in sites 3
and 4). This allows the JACEs to dial the Web Supervisor whenever they need to send
archives or alarms. This setup also allows the Web Supervisor to dial the JACEs to
acknowledge alarms, to maintain the devices using maintenance tools such as Admin
Tool, JDE, or web browser, or to pick up archives, if polled archiving is set up.
Figure 4-1 Multiple JACE-4/5s connecting with direct dial to a Web Supervisor for HMI and alarm and archive purposes.
D
i
a
l
u
p
Router
Browser User Interface (BUI)
Internet
Firewall with Proxy
and NAT
NAT Addresses: 204.253.56.x
ABC Company
Network: 192.168.1.x
Subnet Mask: 255.255.255.0
IP Address:
192.168.1.120
Subnet Mask:
255.255.255.0
IP Address:
192.168.1.125
Subnet Mask:
255.255.255.0
P
r
i
v
a
t
e
L
e
a
s
e
d
D
a
t
a
L
i
n
e
Web Supervisor
Router
Router
JACE-5
R
x
D
T
x
D
D
A
T
A
1
0
0
E
T
H
E
R
N
E
T
L
O
N
R
x
D
T
x
D
R
x
D
T
x
D
R
S
2
3
2
/
R
S
4
8
5
P
O
R
T
2
R
S
2
3
2
P
O
R
T
1
H
E
A
R
T
B
E
A
T
JACE-NP
Ethernet Hub or Switch
Ethernet Hub or Switch
BUI
Ethernet Hub or Switch
Field Controllers Field Controllers
Field Controllers
IP Address:
DHCP assigned
Subnet Mask:
255.255.255.0
IP Address:
192.168.2.98
Subnet Mask:
255.255.255.0
Network: 192.168.2.x
Subnet Mask: 255.255.255.0
D
i
a
l
u
p
Site 2
Site 1
Site 3
Site 4
LAN IP Addresses
External IP Address:
204.253.56.14
Inside IP Address:
192.168.1.53
*Dial-in IP Addresses
IP Address for
RAS Server:
192.168.1.183
IP Address for
Dial-in Clients:
192.168.1.184
LAN IP Address:
192.168.3.5
Subnet Mask:
255.255.255.0
*Dial-in Addresses:
IP Address for RAS
Server (localAddr):
192.168.7.145
IP Address for Dial-in
Clients (remoteAddr):
192.168.7.146
JACE-4
JACE-4
JACE-5
R
x
D
T
x
D
D
A
T
A
1
0
0
E
T
H
E
R
N
E
T
L
O
N
R
x
D
T
x
D
R
x
D
T
x
D
R
S
2
3
2
/
R
S
4
8
5
P
O
R
T
2
R
S
2
3
2
P
O
R
T
1
H
E
A
R
T
B
E
A
T
Modem
LAN IP Address:
192.168.4.3
Subnet Mask:
255.255.255.0
*Dial-in Addresses:
IP Address for RAS
Server (localAddr):
192.168.7.145
IP Address for Dial-in
Clients (remoteAddr):
192.168.7.146
*These dial-in addresses are used to create a temporary mini-network between the dial-up interface of the RAS
server and the dial-up interface of the client. For example, when the JACE dials the Web Supervisor, the WS
assigns the JACE the client address 192.168.1.184, and uses 192.168.1.183 for itself. Alternately, when the
WS dials the JACE, the JACE's RAS server allocates 192.168.7.146 to the WS, and uses 192.168.7.145 for
itself.