Configuring and Managing Host-Based X.25 Links - Edition 5 (36939-90054)

32 Chapter2

Preparing to Conﬁgure DTCs

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 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.

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

to 5.

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 3.

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

bottom of the DTC and card # 1 resides above it, and so

on.

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) Each port needs a logical device (ldev) number assigned

to it, if the DTC is managed by an HP 3000. The ldev

number is used by MPE/iX to designate devices.

Devices with ldevs permanently assigned to them are