IBM 3745 Series Owner's manual

IBM 3745 Communication Controller
Models 130, 150, 160, 170 and 17A IBM
Hardware Maintenance Reference
SY33-2066-4

IBM 3745 Communication Controller
Models 130, 150, 160, 170 and 17A IBM
Hardware Maintenance Reference
SY33-2066-4

Note!
Before using this information and the product it supports, be sure to read the general information under “Notices”
on page vii.
Fifth Edition (January 1994)
The information contained in this manual is subject to change from time to time. Any such changes will be reported in subsequent
revisions. Changes have been made throughout this edition, and this manual should be read in its entirety.
Order publications through your IBM representative or the IBM branch office serving your locality. Publications are not stocked at the
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 Copyright International Business Machines Corporation 1989, 1994. All rights reserved.
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Contents
Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
Electronic Emission Notices .............................. vii
Trademarks and Service Marks ............................ ix
Product Safety Information .............................. xi
General Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Safety Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Service Inspection Procedures ............................. xi
About This Book ................................... xiii
Who Should Use This Book .............................. xiii
Service Personnel Definitions ........................... xiii
How to Use the Maintenance Library ........................ xiii
Where to Find More Information ........................... xiv
Summary of Changes ................................ xv
Chapter 1. General Information . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
3745 in a Network ................................... 1-2
Identification and Capacity .............................. 1-5
Controller Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Programming Support and Network Management ................ 1-20
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
Chapter 2. Central Control Unit (CCU) ...................... 2-1
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
CCU Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Main Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
CCU-to-Storage Interconnection . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
CCU to and from Adapters ............................. 2-20
CCU to and from MOSS ............................... 2-43
CCU Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-43
Performance Test Points .............................. 2-50
Chapter 3. Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Generalities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Bus Propagation Cards (BPC1/BPC2) ....................... 3-29
3746-900/3745 Attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-30
Adapter Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-31
Adapter Bypass Mechanism ............................ 3-48
IOC Bus Scoping Routine .............................. 3-53
Chapter 4. Transmission Subsystem (TSS) ................... 4-1
Low-Speed Scanner (LSS) .............................. 4-7
LIC Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Serial Link (SL) .................................... 4-13
Communication Scanner Processor (CSP) .................... 4-13
Front-End Scanner (FES) .............................. 4-23
Front-End Scanner Adapter (FESA) ........................ 4-27
 Copyright IBM Corp. 1989, 1994 iii

Serial Link (SL) .................................... 4-34
Double Multiplexer Card (DMUX) ......................... 4-35
Single Multiplexer Card (SMUXA/B) ........................ 4-39
LIC Types 1 to 4 Cards ............................... 4-43
LIC Types 5 and 6 DTE Function ......................... 4-54
LIC Type 5 DCE Function .............................. 4-57
LIC Type 6 DSU/CSU Function ........................... 4-80
Problem Determination Aid for LIC Types 1 to 4 ................. 4-92
Problem Determination Aid for LIC Type 5 and LIC Type 6 .......... 4-95
TSS Interface Cables ............................... 4-100
Chapter 5. High Performance Transmission Subsystem (HPTSS) ..... 5-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
Internal Interconnections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
Communication Scanner Processor (CSP) .................... 5-11
Front-End Scanner High-Speed (FESH) ...................... 5-12
Transmit Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
Receive Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-17
Modem Interface Management ........................... 5-19
Error Detection and Reporting ........................... 5-23
Miscellaneous Status Fields ............................. 5-31
Problem Determination Aid ............................. 5-37
Communication Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-40
Chapter 6. The Token-Ring Subsystem ..................... 6-1
Token-Ring Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
The Token-Ring Adapter in the 3745 ....................... 6-10
Token-Ring Interface Coupler (TIC) Card ..................... 6-12
Token-Ring Multiplexor (TRM) Card ........................ 6-15
TRA Resets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-19
Error Detection and Reporting ........................... 6-20
Problem Determination Aid ............................. 6-27
Chapter 7. Channel Adapter (CA) ......................... 7-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4
CA Operating Environment .............................. 7-8
Overall Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
Autoselection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-12
Cycle Steal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-14
CA/MOSS Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-15
Interrupt Requests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-16
Two-Processor Switch (TPS) ............................ 7-17
Channel Stop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-21
Interface Disconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-21
I/O Error Alert ..................................... 7-21
Testing and Checking Hardware .......................... 7-22
CA Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-24
Chapter 8. Maintenance and Operator Subsystem (MOSS) ......... 8-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
MOSS Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5
MOSS Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-8
MOSS States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-9
Branch Trace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11
iv IBM 3745 Models 130, 150, 160, 170, and 17A: Hardware Maintenance Reference

Mailbox Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-13
LSSD Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-17
MOSS/Disk Drive Interaction ............................ 8-19
MOSS/Operator Console Connections ...................... 8-20
Chapter 9. Control Panel, Operator Consoles, Disk/Diskette Drives .... 9-1
Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2
Operator Consoles for Models 1x0 .......................... 9-6
Operator Consoles and Service Processor for Model 17A ............ 9-8
Disk/Diskette Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-9
Chapter 10. Power System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-4
AC Voltages Input .................................. 10-5
Power Control Subsystem ............................. 10-15
Power Mode of Operation ............................. 10-20
Power ON/OFF Sequence ............................ 10-22
Power ON Reset (POR) .............................. 10-29
3746 Model 900 Power Connection and Control ................ 10-34
Chapter 11. Error Logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-4
BER Generalities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-6
BERs Which Are Not Machine Errors ...................... 11-11
Specific Mechanisms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-12
AutoMaint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-16
BER Recovery Procedures ............................ 11-24
Unresolved Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-25
MOSS Error Logging ................................ 11-29
MOSS BERs Used With the IPL Application .................. 11-33
Diagnostics BER Type 03 ............................ 11-123
Power BER Type 04 ............................... 11-125
NCP ESS BER Type 08 ............................. 11-133
NCP 3746 Model 900 BER Type 9 ...................... 11-145
NCP CA BER Type 10 .............................. 11-164
NCP TSS/HPTSS BER Type 11 ........................ 11-179
NCP/PEP BER, Type 12 ............................ 11-191
NCP CCU BER Type 13 ............................ 11-194
NCP IOC BER Type 14 ............................. 11-198
NCP TRSS BER Type 15 ............................ 11-201
Chapter 12. Ethernet Subsystem (ESS) .................... 12-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-5
Frame Types Supported ............................... 12-9
ELA Microcode Description ............................ 12-11
Internal Interconnections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-13
Communication Scanner Processor (CSP) ................... 12-14
Ethernet LAN Coupler Card (EAC) ........................ 12-15
ELA Command Description ............................ 12-18
Parameter/Status Area Layout .......................... 12-29
Error Detection and Reporting .......................... 12-36
Problem Determination Aid ............................ 12-45
List of Abbreviations ................................ X-1
Contents v

Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X-7
Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X-9
Customer Documentation for the 3745 (Models 130, 150, 160, 170, and 17A)
and 3746 (Model 900) ............................... X-9
Service Documentation for the 3745 (Models 130, 150, 160, 170, and 17A)
and 3746 (Model 900) ............................... X-13
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X-17
vi IBM 3745 Models 130, 150, 160, 170, and 17A: Hardware Maintenance Reference

Notices
References in this publication to IBM products, programs or services do not imply
that IBM intends to make these available in all countries in which IBM operates.
Any reference to an IBM product, program, or service is not intended to state or
imply that only IBM's product, program, or service may be used. Any functionally
equivalent product, program, or service that does not infringe any of IBM's intellec-
tual property rights may be used instead of the IBM product, program, or service.
Evaluation and verification of operation in conjunction with other products, except
those expressly designated by IBM, is the user's responsibility.
IBM may have patents or pending patent applications covering subject matter in
this document. The furnishing of this document does not give you any license to
these patents. You can send license inquiries, in writing, to the IBM Director of
Commercial Relations, IBM Corporation, Purchase, NY 10577, U.S.A.
Electronic Emission Notices
Federal Communications Commission (FCC) Statement
Note: This equipment has been tested and found to comply with the limits for a
Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to cause
harmful interference, in which case the user will be required to correct the interfer-
ence at his own expense.
Properly shielded and grounded cables and connectors must be used in order to
meet FCC emission limits. IBM is not responsible for any radio or television inter-
ference caused by using other than recommended cables and connectors or by
unauthorized changes or modifications to this equipment. Unauthorized changes or
modifications could void the user's authority to operate the equipment.
This device complies with Part 15 of the FCC Rules. Operation is subject to the
following two conditions: (1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that
may cause undesired operation.
 Copyright IBM Corp. 1989, 1994 vii

Industry Canada Compliance Statement
This Class A digital apparatus meets all requirements of the Canadian Interference-
Causing Equipment Regulations.
Avis de conformité aux normes d'Industrie Canada
Cet appareil numérique de la classe A respecte toutes les exigences du Règlement
sur le matériel brouilleur du Canada.
Japanese Voluntary Control Council for Interference (VCCI) Statement
This equipment is Class 1 Equipment (information equipment to be used in com-
mercial and industrial districts) which is in conformance with the standard set by
Voluntary Control for Interference by Data Processing Equipment and Electronic
Office Machines (VCCI) with an aim to prevent radio interference in commercial and
industrial districts. This equipment could cause interference to radio and television
receivers when used in and around residential districts. Please handle the equip-
ment properly according to the instruction manual.
Korean Communications Statement
Please note that this device has been approved for business use with regard to
electromagnetic wave interference. If you find this is not suitable for your use, you
may exchange it for one designated for non-business purposes.
viii IBM 3745 Models 130, 150, 160, 170, and 17A: Hardware Maintenance Reference

Trademarks and Service Marks
The following terms, denoted by an asterisk (*), used in this publication, are trade-
marks or service marks of IBM Corporation in the United States or other countries:
ESCON IBM LPDA
MVS NetView OS/2
PS/2 RETAIN VES
VTAM
Notices ix

xIBM 3745 Models 130, 150, 160, 170, and 17A: Hardware Maintenance Reference

Product Safety Information
General Safety This product meets safety IBM standards.
For general safety information, see:

Telecommunication Products Safety Handbook, GA33-0126
Safety Notices See
Safety Notices located at the beginning of the Maintenance Information Proce-
dures manual.
Service Inspection Procedures
The Service Inspection Procedures help service personnel check whether the 3745
conforms to IBM* safety criteria. They have to be used each time the 3745 safety
is suspected.
The
Service Inspection Procedures section is located at the beginning of the 3745
Maintenance Information Procedures (MIP) manual, SY33-2070.
The 3745 areas and functions checked through service inspection procedures are:
1. External covers
2. Safety labels
3. Safety covers and shields
4. Grounding
5. Circuit breaker and protector rating
6. Input power voltage
7. Power-ON indicator
8. Emergency power OFF.
 Copyright IBM Corp. 1989, 1994 xi

xii IBM 3745 Models 130, 150, 160, 170, and 17A: Hardware Maintenance Reference

About This Book
This manual provides:
1. Introductory and how-to-fix information
2. Information for maintaining CSAs (Common Sub-assemblies)
3. Description of IBM 3745 Communication Controller functional units.
The console(s) and operator panel procedures are not provided in this manual, but
are in the:

3745 Advanced Operations Guide , SA33-0097, and 3745 Service Functions ,
SY33-2069, for the maintenance functions used by service personnel.

3745 Basic Operations Guide , SA33-0098 for 3745 Models 130 to 170 or
SA33-0177 for 3745 Model 17A, for the control panel functions.
Who Should Use This Book
This manual is intended for the product support-trained CE (PST CE) to service the
IBM 3745 Communication Controller whenever the product-trained CE (PT CE)
cannot repair the machine using the Maintenance Information Procedures manual.
The person using this
Hardware Maintenance Reference (HMR) manual should:
Have an understanding of the telecommunications environment.
Be trained to service the 3745 Communication Controller.
Be familiar with the data circuit terminating equipment (modems, autocall units,
and so on) and the terminals that attach to 3745s.
Be familiar with the host channel to which the 3745 can be attached.
Service Personnel Definitions
See Maintenance Information Procedures (MIP) SY33-2070, manual.
How to Use the Maintenance Library
Maintenance on the 3745 is performed only when a failure or suspected failure
occurs in the machine. The customer is first expected to perform problem determi-
nation to see if a 3745 problem exists. He uses the Problem Determination Guide
and a host or 3745 console to perform the requested procedures. The problem
determination guide generally produces a reference code that the customer should
provide to the Hardware Central Service (HCS)
If the HCS is contacted, they will confirm that the initial problem determination has
been done correctly, and determine if a hardware failure is indicated. Where hard-
ware replacement is required, the HCS will determine which FRU(s) should be
replaced, and dispatch a CE with the information needed to identify and replace
them. When replacement has been completed, the CE will test the machine as
directed by the
MIP and Service Functions manuals, to verify the repair.
 Copyright IBM Corp. 1989, 1994 xiii

At this point, the Maintenance Information Procedures portion of the 3745 Mainte-
nance Library has been exhausted. If additional problem analysis is required, the
CE should contact the HCS for assistance, since the problem may require special
tools or techniques that are described in the Hardware Maintenance Reference and
Service Functions manuals, and are applied by a Product Support-Trained CE.
Where to Find More Information
See "Bibliography" page X-9.
xiv IBM 3745 Models 130, 150, 160, 170, and 17A: Hardware Maintenance Reference

Summary of Changes
This revised edition gives information concerning the 3745 Model 17A and on the
3746 Model 900 connection.
This edition also corrects minor errors or omissions without the addition of revision
bars.
 Copyright IBM Corp. 1989, 1994 xv

xvi IBM 3745 Models 130, 150, 160, 170, and 17A: Hardware Maintenance Reference

Chapter 1. General Information
3745 in a Network ................................... 1-2
3745 Models 130, 150, 160, and 170 Data Flow ................ 1-3
3745 Model 17A Data Flow ............................ 1-4
Identification and Capacity .............................. 1-5
3745 Model 130 ................................... 1-5
3745 Model 150 ................................... 1-5
3745 Model 160 ................................... 1-5
3745 Model 170 ................................... 1-5
3745 Model 17A ................................... 1-6
Basic Configuration (Minimum Configuration) .................. 1-6
Controller Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Control Subsystem (CSS) ............................. 1-7
Communication Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Low-/Medium-Speed Transmission Subsystem (TSS) ............. 1-9
High-Performance Transmission Subsystem (HPTSS) ............ 1-12
Ethernet Subsystem (ESS) ............................ 1-13
Token-Ring Subsystem (TRSS) ......................... 1-14
Maintenance and Operator Subsystem (MOSS) ............... 1-15
Programming Support and Network Management ................ 1-20
Host-Resident Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
Controller-Resident Programs . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
Generating and Loading the Control Program ................. 1-23
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
Maintenance Aids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
 Copyright IBM Corp. 1989, 1994 1-1

3745 in a Network
The 3745 can be:
.1/ Channel-Attached (via channel adapter) to one or more hosts.
.2/ Link-Attached (via telecommunication facilities) to a host through another IBM
Communication Controller (allowing the 3745 to be used as a remote concentrator).
Then, the 3745 allows simultaneous connection to:
a. Other IBM communication controllers, via high-speed lines (such as T1 or
CEPT) and their associated DCEs.
b. Other IBM communication controllers, via medium- or high-speed lines and
their associated DCEs.
c. Local clusters and terminals, directly attached without DCE.
d. Remote clusters and terminals, via stand-alone DCEs and telecommuni-
cation facilities (switched or non-switched).
e. Remote communication controllers/clusters/terminals via X.25 public data
networks.
f. Remote communication controllers/clusters/terminals via integrated DCEs
and 4-wire nonswitched telecommunication facilities or DDS network in the
US.
g. Communication controllers/clusters/terminals on IBM token-ring local area
networks or Ethernet-type local area networks.
Figure 1-1. 3745 in a Network
1-2 IBM 3745 Models 130, 150, 160, 170, and 17A: Hardware Maintenance Reference