Configuring and Managing Host-Based X.25 Links - Edition 6 (36939-90057)

Preparing to Configure DTCs

Defining the DTC Connector Cards

Chapter 2

Defining the DTC Connector Cards

Connector cards (also called boards) in the DTC allow terminals, printers, and other

serial devices to be connected to the DTC for communication with an HP 3000 Series

900. You can use the DTC Card Configuration worksheet as shown later in this Chapter,

to record the values selected for each DTC card.

For each connector card in a DTC, you must define the characteristics of its ports for

connection to terminals, printers, and other serial devices. The following parameters are

required.

Card Number The card number specifies which card in the DTC is being configured.

DTC 72MXs allow up to 3 connector cards plus a LAN card that is

preinstalled in slot 0; the connector cards are labeled card # 1 through

DTC 48s allow up to 6 connector cards, labeled card # 0 to 5.

For the DTC 48 and 72MX, card # 0 resides at the bottom of the DTC

and card # 1 resides above it, and so on.

DTC 16s allow 2 connector cards, labeled card # 0 and card # 1, with

the third slot (card # 2) reserved for a DTC/X.25 Network Access card.

When looking at the rear panel of the DTC, card # 0 is located on the

left, card # 1 is in the middle, and card # 2 is on the right.

Note that DTC 16iX/16MX/16RX does not have connector cards. Its

port connectors are built directly onto its backplane.

Direct or Modem Connect You must specify whether a direct or modem connection is

used for the ports on a card. Direct connections are used for devices

that reside near the DTC. Modem connections are used for

communications over telephone lines.

Port Number Each port on a connector card is assigned a number, starting with port

# 0 on the left most side of the card.

Logical Device Number (LDEV) All I/O devices on the MPE/iX system are assigned an

ldev number. Devices with ldevs permanently assigned to them are

called nailed devices. Printers and UPSs, as well as devices that will be

programmatically accessed, must be nailed devices. Each nailed ldev

number assigned in NMMGR must be unique. For host-based DTC

management, you may have both direct connect and PAD ports that

are configured as non-nailed devices. Connections from non-nailed

devices are assigned an ldev from a pool of available ldev numbers for

the duration of the device connection to the system.

For Async cards on a managed DTC, you may assign an ldev of (-1) to a

port with a TERMINAL profile type. A port with an ldev of (-1) is a

non-nailed ldev and the DTC port will be downloaded with the

parameters in the specified profile. If you specify ldev of (0) and no

profile, this is also a non-nailed port and the port will be downloaded

with the parameters in the profile configured as the Non-nailed

terminal profile name on the Host Configuration screen.