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Chapter 2
Guidelines for Connecting the 1771 KRF
PLC 3
1775 S5
2 6
Data Highway Broadband Backbone/Data Highway Plus Subnet
Configuration
Broadband cable and modems now replace daisy-chained twinaxial media
and offer a greater distance between nodes as well as multiple networks
coexisting on one cable. The 1785-KA is typically used to link DH+
baseband subnetworks over a DH backbone. This lets you increase the
number of DH+ nodes that can share information without lowering
throughput within subnetworks. Figure 2.3 shows the DH backbone/DH+
subnet configuration where KRFs create a DH broadband backbone.
Figure 2.3
DH broadband/DH+ subnet configuration
baseband cable
Translator
baseband
Data Highway Plus
PLC 2
PLC 5
1785 KA3
Configure the network as follows:
Data Highway Plus twinaxial baseband subnetworks are linked to the
broadband backbone via KRFs attached to the Data Highway port of
the 1785-KA DH/DH+ Communication Adapter modules
KRFs are used with 1770-KF2 and 1771-KE DH/RS-232
Communication Controller modules to connect host computers to the
Data Highway broadband backbone
VAX or any
asynchronous
host
RS 232
1770 KF2
KRF
Data Highway on broadband
KRF
1785 KA
1784 KT
T50
Advisor PC
RS 232
1771 KE
100 ft max
KRF
KRF
1785 KA
PLC 3
PLC 2
1775 S5
1785 KA3
baseband
Data Highway Plus
PLC 5
17273
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