IBM RS/6000 7025 manual Ring Detection, Terminal Emulators, Recovery Procedures

Ring Detection

Most

modems

produce an interrupt request each time they detect a ring signal.

Some

modems

generate

an interrupt

only

on

the

first

ring

signal

they

receive. AT&T

DataPort

2001 is

an

example

of such

a modem.

The

Service

Processor

uses

the

ring

interrupt

request to

count

the

number of

rin

when Ring Indicate Power-On (RIPO) is enabled. If your modem produces an

interrupt

on

only

the

first

ring,

set

Ring Indicate Power-On to

start

on the

fir

Otherwise,

you may choose to start

Ring

Indicate

Power-On on

any

ring

count

that

makes

your

operation

convenient.

Terminal Emulators

The Service Processor is compatible with simple ASCII terminals, and therefore compatible with most emulators. It is for the cases when a remote session is handed off from the Service Processor to the operating system that agreeing ter emulators becomes important.

The	server's		operating system		will have some built-in terminal emulators. You may
also	have	a	commercially	available terminal emulation. It is important that the local
and	host computers select the same or compatible terminal emulators so the					key
assignments		and responses		will	match. This will assure successful communications
and	control.

For best formatting, choose line wrap in your terminal emulator setup.

Recovery Procedures

Line noises, power surges, etc., can sometimes cause your

modem

to

enter an

undefined state. When it is being

used for dial in, dial

out

or

Ring

Indicate

Power-On,

your

modem

is

initialized

each time one of these

actions

is

expected.

one

of

these

environmental conditions

occur

after

your modem

has

been initialized,

may

be

necessary

to

recover your

modem

to a

known state.

Appendix D. Modem ConfigurationsD-5