Configuring Systems for Terminals, Printers, and Other Serial Devices (32022-90057)

Introduction
How Devices Communicate Once They Are Connected
Chapter 1
21
How Devices Communicate Once They Are Connected
With the exception of the system console (and, for certain HP e3000 Serie s900 models),
the remote support modem and the first UPS on the system), which has its own access
port, asynchronous devices are connected to a HP 3000 Series 900 computer through the
Datacommunications and Terminal Subsystem (DTS). DTS includes all of the
Datacommunications and Terminal Controllers (DTCs) connected to the local area
network (LAN), a LAN interface card (LANIC) connecting each host to the LAN, the
LAN cable, and the software that controls all of the DTS hardware. This software resides
on the HP 3000 and on the DTC.
During configuration, a relationship is specified between the system’s LANIC and each
DTC through which asynchronous device connections will be made. A link for the LANIC
is defined using the Node Management Configuration Manager (NMMGR) utility. This
link provides the asynchronous devices with an entry point to the DTS.