Asynchronous Serial Communications Programmer's Reference Manual (32022-90052)

26 Chapter1
Introduction
Datacommunications and Terminal Subsystem (DTS)
Datacommunications and Terminal
Subsystem (DTS)
With the exception of the system console which has its own access port,
all of the asynchronous devices listed here can be connected to HP 3000
Series 900 computers via the Datacommunications and Terminal
Subsystem (DTS). DTS is made up of all of the datacommunications
and terminal controllers connected and configured on the LAN, a LAN
interface card that connects each host system to the LAN, the LAN
cable, and the software that controls all related DTS hardware.
Optionally, there may also be an OpenView workstation on the LAN,
which is a personal computer that functions as a manager for the
network. Each of these components are briefly described.
DTC
The HP Datacommunications and Terminal Controller (DTC)
provides the connection between asynchronous devices and the
HP 3000 Series 900 family of computers. Each DTC is housed in its own
box and connected to the LAN. There are five types of DTCs currently
supported, the DTC 72MX (HP J2070A), the DTC 48 (HP 2345B), the
DTC 16 (HP 2340A), the DTC 16iX (HP J2062A) and the DTC 16MX
(HP J2063A). Figure 1-2 represents the location of the DTCs in relation
to the host systems, the LAN, and the terminals/printers connected to
the network via the DTCs. (Note that the network represented in this
figure includes a single MPE/iX system, two DTC 48s, and does not
include an OpenView workstation.)
Figure 1-2 HP Distributed Terminal Controllers