Rockwell Automation 2708-DH5B2L_DH5B4L Attended Workstation - Manual (Page 75)

Chapter 7
Network Design
7–5
The following is an example of a network extending across a Common
Carrier.
Figure 7.4
Extending Network Across Common Ca;rrier
Indicates RS-232 connect
Indicates RS-485 backbone
W
|
M
|
W
|
W
|
C
|
W
|
W
W Workstation
S Submaster
C Concentrator
M Master
W
|
W
|
W
|
S
|
W
Key:
Backbone
Network
Tributary
Network
HOST
modem modem
Telco
The extension of a network across telephone lines consists of placing a
modem on one side of the line to connect with the Concentrator, and placing
the other modem on the other side to connect with the Submaster.
Figure 7.5
Extending Network Across Common Ca;rrier
Indicates RS-232 connect
Indicates RS-485 backbone
W
|
W
|
G
|
W
W Workstation
S Submaster
C Concentrator
M Master
G Gateway
W
|
S
|
W
|
W
Key:
Backbone
Network
Tributary
Network
HOST modem modem
Telco COM1 COM2
Extending Networks
Over Phone Lines (cont’d)