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Network Guidelines
Typical Applications
Use the following guidelines when you want to add a DH/DH+ or remote
I/O network to your broadband system:
You need a channel translator (use the Allen-Bradley 6600 channel
translator) at the head-end of the broadband cable system
The 1771-KRF has been tested with a wide variety of DH/DH+
interface modules. Before installing the 1771-KRF, refer to the page
1-4 to verify that it has been tested with the DH/DH+ or remote I/O
module you intend to use
Configure all KRFs that connect devices on a common network or
subnetwork for the same channel pair
The KRF operates on a cable system that meets the requirements of the
MAP/TOP or IEEE 802.7 broadband media specification
To determine the maximum allowable distance for your application
from the KRF DH/DH+ or remote I/O module to the headend
translator, see page 1-4
You need one KRF module for each DH/DH+ or remote I/O port you
connect to the broadband
The baseband twinaxial cable between the DH/DH+ or remote I/O port
and the KRF should be as short as possible. The maximum length for
this cable is 100 ft
The maximum number of nodes allowed on the DH/DH+ broadband
link is 64
The communication rate over the DH/DH+ or remote I/O link is 57.6
or 115.2K baud. The baud rate you use depends on the modules you
connect to and their configurations
The maximum number of nodes on a remote I/O link depends on the
processor type (See the appropriate user's manual for details)
Important: The 1771-KRF acts as a modem to connect individual
DH/DH+ or remote I/O stations to a broadband DH/DH+ or remote I/O
network. Do not connect more than one DH/DH+ or remote I/O device to
the twinaxial cable of the KRF.
This section contains four typical applications for the KRF involving:
a single DH broadband link
a single DH+ broadband link
a DH broadband backbone linking DH+ twinaxial baseband
subnetworks
a single remote I/O broadband link
It shows you how these networks are configured and explains the benefits
of each.
Chapter 2
Guidelines for Connecting the 1771 KRF
2 3
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