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.
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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