Troubleshooting Terminal, Printer and Serial Device Connections - Edition 4 (32022-90030)

14 Chapter 1
General Information
Datacommunications and Terminal Subsystem (DTS)
Datacommunications and Terminal
Subsystem (DTS)
With the exception of the system console which has its own access port,
all asynchronous serial devices can be connected to HP 3000 Series 900
computers through the Datacommunications and Terminal Subsystem
(DTS). DTS is made up of all of the Datacommunications and Terminal
Controllers connected to the system, a LAN Interface Card, the LAN
cable and the host software that controls all the related DTS hardware.
Datacommunications and Terminal Controller
The Datacommunications and Terminal Controller (DTC) provides the
connection between asynchronous devices and the HP 3000 Series 900
family of computers. The DTC can house an X.25 Network Access Card
to provide connections for nailed PAD-connected terminals and
printers. Also, a DTC containing a Telnet Access Card can provide
Telnet connections to an HP 9000 or other ARPA machine via Telnet/iX.
The DTC is housed in its own box, outside the system cabinet. This
alleviates system limitations which are based on cabinet space
considerations, and allows flexibility in the layout of terminal cables.
Figure 1-1represents the location of the DTCs in relation to the system,
the LAN, and the terminals and printers connected to the system
through the DTCs.
Figure 1-1 Datacommunications and Terminal Controller