Troubleshooting Terminal, Printer, and Serial Device Connections - Edition 5 (32022-90058)

General Information
Datacommunications and Terminal Subsystem (DTS)
Chapter 1
17
access to X.25 networks, and can be used to connect asynchronous devices through PAD
connections. Alternatively, a single Telnet Access Card per DTC can be used to access
MPE/iX systems from ARPA systems.
Each DTC 48 provides six slots, each of which can contain one of the following connector
cards:
• Eight 3-pin RS-232-C local connections.
• Eight 5-pin RS-422 local connections.
• Six 25-pin RS-232-C modem connections.
• DTC/X.25 Network Access card (up to three per DTC, slots 1 through 5 only).
• Telnet Access Card (only 1 per DTC, slots 1 through 5 only).
Each DTC 72MX can provide connections for up to 72 local and remote devices. Local and
remote connections can be mixed on the same DTC, since its design is modular. Each
DTC 72MX provides four slots, one slot for the LAN card, and three slots each of which
can contain one of the following connector cards:
• Asynchronous processor board with three 62-pin connectors, for 24 RS-232 local or
modem connections.
• Asynchronous processor board with three 62-pin connectors, for 24 RS-423A local
connections.
• DTC/X.25 Network Access card (up to three per DTC).
• Telnet Access Card (only 1 per DTC).
The DTC 16 contains three slots. The first two slots and only the first two slots (card #0
and card #1) can contain direct connect or modem cards. The third slot (card #2) can
contain only a DTC/X.25 Network Access Card.
Each DTC 16iX and DTC 16MX can provide RS-232 or RS-423 port connections for up to
16 asynchronous devices. They both have two port connectors built directly into their
backplanes, each of which can be connected to a distribution panel which allows either
all direct connections or all modem connections. The DTC 16iX does not support ARPA
Telnet or X.25 connections. The DTC 16MX provides AFCP connections for the HP 3000
environment and telnet connections for the ARPA environment; it does not support X.25
connections for wide area networking. The DTC 16MX managed by an MPE/iX host is
limited to identical functionality as the DTC 16iX.
The DTC is controlled by software that is downloaded by its host system at boot time or
by the OpenView Windows Workstation, depending on the type of management used.
Systems can use either host-based management or PC-based management. Refer to
Configuring Systems for Terminals, Printers and Other Serial Devices for more
information on host-based management and PC-based management.
The downloaded software includes DTC operating code and configuration information.
Once the software is downloaded, the DTC is ready for operation. Devices physically
connected to its ports and properly configured can establish communications links with
the host computer.
You can troubleshoot connections with TermDSM only on systems that use host-based
management. Troubleshooting for PC-based management is covered in Using HP
OpenView DTC Manager.