IBM 3720 User manual

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Publication Number
GA33-0086-2
IBM 3720 Models 1, 2, 11, and 12
IBM 3721 Models 1 and 2
Communication Controllers
Problem Determination
System/370, 30xx, 4300,
and 9370 Processors
File Number
S370/30xx/4300/9370·09

Third Edition (July 1988)
This major revision obsoletes GA33-0086-1.
It reflects enhancements to the IBM 3720 Communication
Controller.
Changes or additions to the text and illustrations are indicated by a vertical line to the left of the change.
Reference in this publication to
IBM products, programs, or services does not imply that IBM intends to
make these available in all countries in which IBM operates. Any reference to an IBM licensed program in
this pUblication is not intended to state or imply that only IBM's licensed program may be used. Any
functionally equivalent program
may be used instead.
The information contained in this manual is subject to change from time
to time. Any such changes will be
reported
in subsequent revisions or Technical Newsletters.
Publications are not stocked at the addresses given below. Requests for IBM publications should made to
your IBM representative or to the IBM branch office serving your locality.
A form for reader's comments is provided
at the back of this publication. If the form has been removed,
comments may be addressed to either
of the following:
• International Business Machines Corporation, Department 6RILG,
180 Kost Road, Mechanicsburg, PA 17055, USA
• IBM France, Centre d'Etudes et Recherches, Departement 0798,
06610
La Gaude, France.
IBM may use
or distribute any of the information you supply in any way it believes appropriate without
incurring any obligation
to you.
© Copyright International Business Machines Corporation 1986, 1987, 1988

Preface
The 3720/3721 Communication Controllers Problem Determination Guide is
designed to help the teleprocessing specialist to identify 3720 problems. This
manual contains:
• Problem Determination procedures
• Alarms, hexadecimal codes
• Some 3720 functions you may need to identify 3720 problems
• A 3720 bibliography
• An index that contains also entries from:
The 3720/3721 Communication Controller Operator's Guide
The 3720/3721 Communication Controller Extended Services manual.
Preface 111

iv 3720/3721 Communication Controller Problem Determination Guide

Contents
Unable to Power On the 3720 Model 1 or 11 ••••••••••••••••••••••••••••••••••••••••••• 1-1
Unable to Power Off the 3720 Model 1 or 11
1-5
3720 Model 1 or 11 Drops Power ••••••••••••••••••••••••••••••••••••••••••••••••••• 1-7
Unable to Power On the 3720 Model 2 or 12 1-11
Unable to Power Off the 3720 Model 2 or 12 1-13
3720 Model 2 or 12 Drops Power •••••••••••••••••••••••••••••••••••••••••••••••••• 1-15
Local Operator Console ........................................................... 1-1
No IBM Copyright Screen for Local Operator Console ................................... 2-2
Terminal Disconnected for Remote Console is displayed, or Remote Console Active Lamp is On ..... 2-3
Message COMM NOT READY 2 is displayed on the 3161 ................................ 2-4
Message LINE CHECK 2 is displayed on the 3101 ...................................... 2-4
Message SENDING is blinking on an IBM PC Emulating a 3101 ........................... 2-4
Remote Operator Console ............................ . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-5
Permanent Ringing ............................................................. 2-7
No IBM Copyright Screen on Remote Operator Console .................................. 2-8
No Answer After Correct Password or ............................................... 2-9
No Answer During Console Session ................................................. 2-9
3720 Model 1 or 11 Load Problems If IPL Performed from Host
3-1
3720 Model 2 or 12 Load Problems If IPL Performed from Host 3-3
3720 Modell, 11, 2 or 12 Load Problems If IPL Performed from Disk •••••••••••••••••••••••• 3-S
Line Problems ................................................................. 4-1
CCITT V.24 -Non-Switched Modem Attachment ....................................... 4-3
CCITT V.35 - Modem Attachment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-3
CCITT V.24/V.35 -Direct Attachment ............................................... 4-5
CCITT V.25 Autocall ........................................................... 4-7
CCITT X.21 - Modem Attachment ................................................. 4-9
CCITT V.24 -Switched Modem Attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-11
Modem Tests ................................................................ 4-12
Modem and Link Tests ......................................................... 4-13
Token-Ring Interconnection (TRI) Problems ......................................... 4-15
TRI Problem Determination ..................................................... 4-23
Power Check Lamp(s) is On .••.••..•.•••.•••••••.•.•.••.••••••••••.••••••••••••••• 5-1
1\IOSS Inoperative Lamp is On 5-3
Disk Problems ................................................................. 5-5
Contents V

Host Messages 5-7
Information on the Control Program, EC Level, MCF ••••••••••••••••••••••••••••••••••••• 5-9
Information on Disk Control Program
Load Modules, Dump ••••• e e " e " • 0 " " " •••• " ••• ;0 • • • • • •• 5-11
Alarms ...................................................................... 6-1
How to Display an Alarm ........................................................ 6-1
NetView or NPDA V3R2 (VSE) with 3720 PTF Messages ................................. 6-4
NPDA V3 Messages ............................................................ 6-5
VTAM Alerts ................................................................. 6-6
Hexadecimal Codes Displayed on the Control Panel
•••••••••••••••••••••••••••••••••••••• 7-1
Tailgate Wrap Test ............................................................. 8-1
Tailgate Wrap Test Messages ...................................................... 8-7
Console Link Test .............................................................. 9-1
Appendix A. Task-Oriented Bibliography ••••••••••••••••••••••••••••••••••••••••••••• A-I
Tasks to Be Performed: Before Installation ............................................ A-I
Tasks
to Be Performed: During Installation ........................................... A-3
Tasks
to Be Performed: At Integration into the Network .................................. A-4
Tasks to Be Performed: During Operation ............................................ A-5
Abbreviations and Glossary
•••••••••••••••••••••••••••••••••••••••••••••••••••••••• A-7
Index ....................................................................... X-I
VI 3720/3721 Communication Controller Problem Determination Guide

Select the Most
Appropriate
Symptom
Problem Determination Start Page
1 Alarms / NPDA Messages / VTAM Alerts
1 Host Messages
IHexadecimal Codes on the Control Panel
Unable to Power On the 3720
Modell or 11
(Power lamp does not turn on) Model 2
or 12
Unable to Power Off the 3720
Modell or 11
(Power lamp does not tum off) Model 2
or 12
Modell or 11
3720 Drops Power Model 2
or 12
IConsole Problems Local
Remote
3720 Modell or 11
Unsuccessful Load From Host 3720 Model 2
or 12
GO TO
PAGE
16-1
15-7
17-1
1-1
1-11
1-5
1-13
1-7
1-15
2-1
2-5
3-1
3-3
Unsuccessful Load from Disk 3-5
Line Problems 4-1
Token-Ring Interconnection Problems 4-15
Disk Problems 5-5
Power Check Lamp is On 5-1
MOSS Inoperative Lamp is On 5-3
Information on the Control Program, EC Level, MCF 5-9
IInformation on Disk Control Program Load Modules, Dump 5-11
Start Page

bI rr=iI IUnable To Power On the 3720 Model 1 or 11
E1 B ilJ
10 0 0 01
o0 0 _____ _____
IF
HOST
WITH AUTO
POVER ON
LOCAL
NETVOAIC
WITH AUTO
POVER ON
IF WITH~
(._::iI::POVER~LOCAL~ON
NETVDRIC
WITH AlITO
PDVER ON
Go to page 1-2
HOST
WITH Auro
POWER ON
NETVDAIC
WITH AUTO
POVER ON
Go to page 1-3
LOOK AT THE
POWER CONTROL
SWITCH
Check the
Power switch on
the control panel.
Ask host operator
if connected hosts
are powered off.
Check the
Power Check lamp
on the control panel.
Check the customer
circuit breakers.
Check
if there is
power
at the outlet.
If it is on Power Off, set it
to Power On.
If powered off, normal condition.
3720 will be powered on
as soon as at least
one host is powered on.
If on : Go to page 5-1.
If necessary, restore power.
Set Power Control
to LOCAL
Press Power switch to power
Off then On.
Set back Power Control
to HOST.
If none of the above applies:
®> (Go to page viii)
In case of an emergency only:
• Power on the 3720 as follows:
-Set the Power Control switch to LOCAL
-Press General Reset switch
-Press Power switch
to power Off then On
• if the problem persists: ®> (Go to page viii)
Unable to Power On the 3720 Model 1 or 11 1-1

IF r
r-'\
HOST
Check the Power Check lamp
If on : Go to page 5-1.
WITH AUTO
POWER ON
on the control panel.
"
LOCAL
\.
./ NETWORK
WITH AUTO
POWER ON
Check the customer circuit
breakers.
If necessary,
restore power, Then:
Press Power switch
to power Off then On.
Check if there is power
at the outlet.
If none of the above applies: W (Go to page viii)
\.
1-2 3720/3721 Communication Controller Problem Determination Guide

IF Check the
Power Check lamp
on the control panel.
If on: Go to page 5-1.
Check the customer
circuit breakers.
If necessary,
restore power. Then:
Press Power switch
to power
Off then On.
Check if there is
power at the outlet.
If none of the above applies: ® (Go
to page Ylii)
In case of an emergency only:
• Power on the 3720 as follows:
-Set the Power Control switch to Local
-Press Power Orf
-Wait 10 seconds
-Press Power On
• If the problem persits: ® (Go to page Yiii)
Unable to Power On'the 3720 Model I or 11 1-3

1-4 3720/3721 Communication Controller Problem Determination Guide

IUnable to Power Off the 3720 Model 1 or 11
~DJ,...---_
000...--..____.
IF
IF
IF
HOlT
WITH AUTO
PCM£R lit
NETVORIC
VITH AUTO
PCMR lit
~.v~
"
It
LOCAL.
J NETIIIJIII(
VITH AUTO
POWER lit
IIIST
WITH AUTO
POWER lit
NETI/OIIIC
WITH AUTO
POVER lit
Go to page 1-6
LOOK AT THE
POWER CONTROL
SWITCH
,
Ask host operator
if at least one
of the connected
hosts is powered on.
If it is, normal condition. 3720 will be
powered off as soon as all hosts are
powered off.
If none of the above applies: ® (Go to page viii)
In case of an emergency only, power off the 3720
by setting the Power switch to Power Off. The
hexadecimal code
130 is then displayed. If you
still cannot power off, trip the customer
circuit breakers.
® (Go to page viii)
In case of an emergency only, power off the 3720
by tripping the customer circuit breakers.
"'"
~
Unable to Power orr the 3720 Modell or 11 1-5

r
IF Ask the network host operator
if a Remote Power Off
HOST
(RPO) command has been sent.
""~~
POWER ON
1 LOCAL
RPO NOT sent: Normal condition. The 3720 will
NETVORIC
VITH AUTO
be powered offas soon as the
Y PaVER ON
RPO command is received.
RPO sent:
W (Go
to page viii)
In case
of an emergency only, power off
the 3720 by setting the Power switch to
Power Off. The hexadecimal code 130 is
then displayed. If you still cannot power
off, trip the customer circuit breakers.
~
1-6 3720/3721 Communication Controller Problem Determination Guide

§ B[[]
;::10=0=---=0=0:::;'
13720 Model 1 or 11 Drops Power
DDDr::--t-...-.
IF
HOST
WITH AUTO
POWER ON
LOCAL
NETWORK
WITH AUTO
POWER ON
IF
HOST
WITH AUTO
( ___ ,'r-iiiiPOVER~ON~
LOCAL
NETVORIC
WITH ~TO
POWER ON
Go to page 1-8
HOST
WITH AUTO
POWER ON
LOCAL
NETWORIC
IIITHAUTO
POWER ON
Go to page 1-9
LOOK AT THE
POWER CONTROL
SWITCH
Ask host operator
if all connected
hosts are powered
off.
If powered off, normal condition.
3720 will be powered on as soon
as
at least one host is powered on.
Read the hexadecimal I I I IThe retry capability is
code
on the control 3 0 0 attempting to power on.
panel.
If the code remains more than
one minute:
@ (Go to page viii)
Any other code: Go to page 7-1.
Check the
Power Check lamp
If on: Go to page 5-1.
on the control panel.
Check the customer
If necessary, restore power:
circuit breakers. Press Power Off
Check if there is Wait
10 seconds
power
at the outlet. Press Power On.
If none of the above applies: @ (Go to page viii)
In case of an emergency only:
• Power on the 3720 as follows:
-Set the Power Control switch to Local
-Press General Reset
-Press Power switch to power Off then On.
•
If the problem persits: @ (Go to page viii)
3720 Model 1 or 11 Drops Power 1- 7

r
-.,
Check the
If on: Go to page 5-1.
Power Check lamp
1Fr\
HOST
on the control panel.
WITH AUTO
POWER ON
it
lOCAL
Check the customer
"
./ NETIIOAK
If necessary,
WITH AUTO
circuit breakers.
POWER ON
restore power. Then:
Check
if there is Press Power switch
power
at the outlet. to power
OfT then On.
If none of the above applies, set the Power switch to
Power OfT, wait 10 seconds, then set it to Power On.
If the 3720 does not power on:
I
~
(Go to page viii) I
\.
1-8 3720/3721 Communication Controller Problem Determination Guide

OR
HOST
'
"
V~AUT~
, UICAL
NETVIlRIC
VITH AUTO
7 POIIEA ON
r Ask the network host operator if a Remote Power Off (RPO)
command has been sent.
-RPO NOT sent:
-RPO sent:
Perform action required for the
hex code displayed on the control
panel. Go to Chapter
7-1.
Normal condition. The 3720 has
been powered off
by the RPO
command.
Read the hexadecimal 13 10 I0IThe retry capability is
code on the control . . . . attemptmg to power on.
panel.
If the code remains more than
one minute:
@ (Go to page viii)
Any other code: Go to page 7-1.
Check the
Power Check lamp
on the control panel.
If on : Go to page 5-1.
Check the customer
circuit breakers.
Check
if there is
power at the outlet.
If none of the above applies:
If necessary,
restore power. Then:
Press Power switch
to power Off then
On.
@ (Go to page viii)
In case of an emergency only:
• Power on the 3720 as follows:
-Set the Power Control switch to Local
-Press Power Off
-Wait 10 seconds
-Press Power On
• If the problem persists: @ (Go to page viii)
3720 Modell or 11 Drops Power 1-9

1-10 3720/3721 Communication Controller Problem Determination Guide

IUnable to Power On the 3720 Model 2 or 12
r--l r:::--I Check the
L-...J 12.........J-1J..--I-_--t---- Remote Power Off
(Q:J I2:J lamp on the
(Q:J U control panel.
(Q:J U
Check the
If the lamp is on, power on the 3720
as follows:
2. Press Power Off
Wait 10 seconds
Press Power On
Power Check lamps If any are on: Go to page 5-1.
on the control panel.
Check the customer
If necessary, restore power:
circuit breakers. Press Power Off
Check if there is
Wait 10 seconds
power
at the outlet. Press Power On.
If none of the above applies: ® (Go
to page viii)
Unable to Power On the 3720 Model 2 or 12 1-11