IBM ibm 3745 Panel Codes , 1-20

3745 Panel Codes

Table 1-5 (Page 6 of 33). Panel Codes. An

ñ

following a panel code denotes that the code should 'Blink'.

Panel

Code Definition Action: Go to “3745 FRU Group

Table” on page 1-49

or to MAP number

0F7ñEIRV REGISTER IS NOT X'00' IN TEST 7 READ ID

COMMAND TEST

Exchange the FRU group 16

0F8ñDATA TRANSMISSION ERROR HSTAT BITS

0,1,2,3,6,7 ARE NOT ZERO READ ID COMMAND

TEST

0F9ñERROR ON HEAD ADDRESSING MECHANISM READ

ID COMMAND TEST

0FAñERROR IN SSB BYTE 0 READ ID COMMAND TEST

0FBñERROR IN SSB BYTE 1 AND 2 READ ID COMMAND

TEST

Exchange the FRU group 16

0FCñ

ADAPTER IN BUSY STATE IN TEST 8 BSTAT BITS

0,1 ARE NOT B'00' OR ADAPTER NOT ENABLE

BSTAT BIT 6 IS NOT ONE RECALIBRATE COMMAND

BEFORE SEEK TEST

0FDñIOIRV REGISTER IS X'00' IN TEST 8 NO INTER-

RUPT RECEIVED RECALIBRATE COMMAND

BEFORE SEEK TEST

0FE Unused Go to “MAP 3220: Undefined Panel

Message” on page 2-5

0FFñADAPTER IN BUSY STATE IN TEST 8 BSTAT BITS

0,1 ARE NOT B'00' OR ADAPTER NOT ENABLE

BSTAT BIT 6 IS NOT ONE SEEK COMMAND TEST Exchange the FRU group 16

100 Unused Go to “MAP 3220: Undefined Panel

Message” on page 2-5

101 HARD DISK INITIAL STATE IS NOT OK. A

RECOVERY PROCEDURE IS RUNNING. Exchange the FRU group 16

102 HARD DISK INITIAL STATE NOT OK (EVEN AFTER

A RECOVERY PROCEDURE).

103 to 110 Unused Go to “MAP 3220: Undefined Panel

Message” on page 2-5

111ñIOIRV REGISTER IS X'00' IN TEST 8 NO INTER-

RUPT RECEIVED SEEK COMMAND TEST

Exchange the FRU group 16

112ñEIRV REGISTER IS NOT X'00' IN TEST 8 SEEK

COMMAND TEST

113ñDATA TRANSMISSION ERROR HSTAT BITS

0,1,2,3,6,7 ARE NOT ZERO SEEK COMMAND TEST

114ñDIFFERENT HEAD NUMBERS SEEK COMMAND

TEST

115ñERROR IN SSB BYTE 0 SEEK COMMAND TEST

Exchange the FRU group 16

116ñERROR IN SSB BYTE 1 AND 2 SEEK COMMAND

TEST

117ñ

ADAPTER IN BUSY STATE IN TEST 9 BSTAT BITS

0,1 ARE NOT B'00' OR ADAPTER NOT ENABLE

BSTAT BIT 6 IS NOT ONE READ/WRITE A SECTOR

COMMAND

118ñIOIRV REGISTER IS X'00' IN TEST 9 NO INTER-

RUPT RECEIVED READ/WRITE A SECTOR

COMMAND

119ñEIRV REGISTER IS NOT X'00' IN TEST 9

READ/WRITE A SECTOR COMMAND

Exchange the FRU group 16

11AñDATA TRANSMISSION ERROR HSTAT BITS

0,1,2,3,6,7 ARE NOT ZERO READ/WRITE A SECTOR

COMMAND

11BñDIFFERENT WRITTEN AND READ SECTORS

READ/WRITE A SECTOR COMMAND

11CñERROR IN SSB BYTE 0 READ/WRITE A SECTOR

COMMAND

1-20 3745 Models 130 to 17A: MIP

Contents

Main Page Page Tenth Edition (June 1997) Contents iv vi Page Page Figures x xii Tables Page Notices European Union (EU) Statement Electronic Emission Notices Federal Communications Commission (FCC) Statement Trademarks and Service Marks xvi Product Safety Information General Safety Service Inspection Safety Procedures Safety 1 IBM 3745 Communication Controller Models 130 to 17A, Parts Catalog 2 3 4 a b 2 xx Page Page Page Safety 3 xxiv Ground Pin c Ground Pin d Safety xxvi e IBM 3746 Nways Multiprotocol Controller Models 900 and 950, Parts Catalog IBM 3746 Expansion Unit Model 900, Parts Catalog IBM 3745 Communication Controller Models 130 to 17A, Parts Catalog 5 7 xxviii 8 Safety Control Panel LED Status Versus 3746-900 States xxx The ac outlet distribution box of the controller expansion contains two fuses: 7 A 250 V slow. 3745/3746-900 Power Supply CP/CB and Fuse Reference Controller Expansion Fuse Reference 1 Safety IBM 3745 Communication Controller Models 130 to 17A, Parts Catalog xxxii 2 3 4 a b 2 Page Page Page 3 Safety c xxxviii d Page Safety e xl IBM 3746 Nways Multiprotocol Controller Models 900 and 950, Parts Catalog IBM 3746 Expansion Unit Model 900, Parts Catalog IBM 3745 Communication Controller Models 130 to 17A, Parts Catalog Safety 7 xlii 8 Bedeutung der LEDs am Bedienungsfeld der 3746-900 Sicherungen der Erweiterung der Steuereinheit Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Safety Label on the 3746-900 Figure 0-23. 3746 Model 900 (Frame 07) Label Locations Safety Label on LCB S Figure 0-24. LCB Safety Label Location 3745/3746-900 Safety Label Identifications lx CAUTION >18Kg >32Kg > < Safety LCB Safety Label lxii Controller Expansion Label Location Safety Label Part Numbers by Country Table 0-9. Safety Label Numbers by Country Page IBM 3745 Communication Controller Service Function Problem Determination Guide Preface About this Manual Page Summary of Changes Page Chapter 1. START: How to Begin Troubleshooting IBM 3745 Advanced Operation Guide Console Use for Maintenance START 1-2 Chapter 1. START: How to Begin Troubleshooting 1-3 Service Processor Window Overview (For a detailed menu, see the 3746-900 Service Guide) START Selection Table 1-4 Problem Analysis Guide 3745 Problem Determination Guide Going from top to bottom in the table, select the first entry point which fits your situation. Page START 3745 Maintenance Actions 1-6 Problems During Machine, EC, or MES Installation 3745 Hardware Maintenance Reference 3745 Installation Guide Selection Table Symptom Index 1-8 Symptom Index General Verbal Symptoms Table 1-1 (Page 1 of 2). General Symptoms Table 1-1 (Page 2 of 2). General Symptoms Symptom Index 3745 Console Symptoms 1-10 IBM 3745 Advanced Operation Guide Table 1-2. 3745 Console Symptoms IBM 3745 Communication Controller Service Function 3745 Control Panel Symptoms Table 1-3. Control Panel Symptoms Symptom Index 3745 Power Symptoms 1-12 Table 1-4. PowerSymptoms Miscellaneous Information Reference Codes Using Reference Codes 1-14 3745 Control Panel Codes Table 1-5 (Page 1 of 33). Panel Codes. An For the 3746 Model 900 panel code, refer to the IBM 3746 Nways Multiprotocol Controller Model 900 Service Guide , SY33-2116. 3745 Panel Codes Table 1-5 (Page 2 of 33). Panel Codes. An 1-16 Table 1-5 (Page 3 of 33). Panel Codes. An 3745 Panel Codes Table 1-5 (Page 4 of 33). Panel Codes. An 1-18 Table 1-5 (Page 5 of 33). Panel Codes. An 3745 Panel Codes Table 1-5 (Page 6 of 33). Panel Codes. An 1-20 Table 1-5 (Page 7 of 33). Panel Codes. An 3745 Panel Codes Table 1-5 (Page 8 of 33). Panel Codes. An 1-22 Table 1-5 (Page 9 of 33). Panel Codes. An 3745 Panel Codes Table 1-5 (Page 10 of 33). Panel Codes. An 1-24 Table 1-5 (Page 11 of 33). Panel Codes. An 3745 Panel Codes Table 1-5 (Page 12 of 33). Panel Codes. An 1-26 Table 1-5 (Page 13 of 33). Panel Codes. An 3745 Panel Codes Table 1-5 (Page 14 of 33). Panel Codes. An 1-28 Table 1-5 (Page 15 of 33). Panel Codes. An 3745 Panel Codes Table 1-5 (Page 16 of 33). Panel Codes. An 1-30 Table 1-5 (Page 17 of 33). Panel Codes. An 3745 Panel Codes Table 1-5 (Page 18 of 33). Panel Codes. An 1-32 Table 1-5 (Page 19 of 33). Panel Codes. An Token-Ring Network, Problem Deter- mination Guide 3745 Panel Codes Table 1-5 (Page 20 of 33). Panel Codes. An 1-34 Service Processor Installation and Token-Ring Network, Problem Determination Guide Table 1-5 (Page 21 of 33). Panel Codes. An 3745 Panel Codes Table 1-5 (Page 22 of 33). Panel Codes. An 1-36 Table 1-5 (Page 23 of 33). Panel Codes. An 3745 Panel Codes Table 1-5 (Page 24 of 33). Panel Codes. An 1-38 Table 1-5 (Page 25 of 33). Panel Codes. An 3745 Panel Codes Table 1-5 (Page 26 of 33). Panel Codes. An 1-40 Table 1-5 (Page 27 of 33). Panel Codes. An IBM 3745 Service Functions 3745 Panel Codes Table 1-5 (Page 28 of 33). Panel Codes. An 1-42 Table 1-5 (Page 29 of 33). Panel Codes. An 3745 Panel Codes Table 1-5 (Page 30 of 33). Panel Codes. An 1-44 3745 Service Functions Table 1-5 (Page 31 of 33). Panel Codes. An IBM 3745 Service Function Chapter 9 and 11 3745 Panel Codes Table 1-5 (Page 32 of 33). Panel Codes. An 1-46 3745 Service Functions Page FRU Group Table Using the MIP FRU Group Table 1-48 3745 FRU Group Table Very important Read the previous page before using this table. Table 1-6 (Page 1 of 3). 3745 FRU Table FRU Group Table Table 1-6 (Page 2 of 3). 3745 FRU Table 1-50 Table 1-6 (Page 3 of 3). 3745 FRU Table FRU Group Table 3745 Cable Location 1-52 Table 1-7. 3745 Cable Location 3745 FRU List IBM 3746 Nways Multiprotocol Controller Model 900 Service Guide IBM 3746 Nways Multiprotocol Controller Model 900 Service Guide 3745 FRU List Airline Line Control Scanner RPQ 7L1148 Supplement to Service Documentation 1-54 3745 and Service Processor Maintenance Using a CPN Service Processor Installation and Maintenance IBM 3746 Nways Multiprotocol Controller Model 900 Service Guide Service Processor Installation and Mainte- nance 3745 and Service Processor Maintenance 1-56 Service Processor Maintenance Using an SRC Sequence Number 3745 and Service Processor Maintenance Engineering Data Transfer Overview 1-58 Transferring Engineering Data from the Local Service Processor Transferring 3745 Engineering Data to MOSS-E Logon on the Remote Service Processor Transferring Engineering Data to the Remote Service Processor Disabling Procedures 3745 Diagnostic Requirement 1-60 Table 1-8. 3745 Diagnostic Requirements Disabling Procedure 0110: Preparing a CA for Maintenance Guide Disabling Procedures Disabling Procedure 0120: Preparing a TSS/HPTSS/ESS for Maintenance 1-62 Figure 1-2. TSS Service Screen Figure 1-3. Select/Release Screen Disabling Procedures Figure 1-4. Mode Control Screen 1-64 (A) Enter 5 here for TSS diagnostics or 7 for HPTSS/ESS. Figure 1-5. TSS/HPTSS/ESS Diagnostic Selection Screen Disabling Procedure 0130: How to Put the MOSS Offline: Preparing the MOSS for Maintenance Using the 3745 Console Using the Control Panel Disabling Procedures Disabling Procedure 0140: Preparing a TRSS for Maintenance 1-66 Figure 1-6. TRSS Service Screen Figure 1-7. Select Screen Disabling Procedures Figure 1-8. Connect/Disconnect Screen 1-68 (A) Enter 6 here for TRSS diagnostics. Figure 1-9. TRSS Diagnostic Selection Screen Disabling Procedure 0150: Preparing LIC Type 1, 3, 4, 5, 6 for Maintenance Disabling Procedures 1-70 Disabling Procedures (A) Enter 5here for TSS diagnostics or 7 for HPTSS. 1-72 (C) Enter the number of the line (00-15) or (00-31) here. Figure 1-10. TSS/HPTSS Diagnostic Selection Screen LIC/Line Address Table Disabling Procedures Figure 1-11. TSS Service Screen 1-74 Figure 1-12. Select/Release Screen Figure 1-13. Mode Control Screen Page Page 3745 Control Panel 3745 Control Panel Use 1-78 Purpose of the Control Panel Uses of the Control Panel Explanation of 3745 Panel Keys, LEDs, and Switches Validate Key: Exit Key: Power On/Reset Key: Power Off Key: 3745 Control Panel PowerControl 1-80 Unit Emergency Only OFF Table 1-10. Panel Display Values Auto Restart 3745 Control Panel How to Perform 3745 Control Panel Operations 1-82 Power On Reset 0FF4 x 3 x x x x 0000 x 3 x x x x Request Local Console Force Local Console Panel Test and Console Link Tests Load from Diskette Loop on MOSS Diagnostics Page Chapter 2. Map for FRU Isolation IOC Bus MAPs MAP 0100: IOC Bus Trouble Shooting 3745 MAPs 2-2 3745 MOSS MAPs MAP 3200: MOSS Control Panel Code 001 3745 MAPs MAP 3210: MOSS Control Panel Code 059 2-4 MAP 3220: Undefined Panel Message 3745 MAPs MAP 3230: Console Link Procedure 2-6 3745 Line Adapter MAPs MAP 3500: Activate/Deactivate Line Problem or Line Errors on the TSS 3745 MAPs MAP 3520: Activate/Deactivate Ring Problems or Ring Errors on the TRSS 2-8 MAP 3530: Activate/Deactivate Line Problems or Line Errors on the HPTSS/ESS 3745 MAPs 3745 Channel MAPs MAP 3700: CA Isolation Procedure 2-10 3745 MAPs 3745 Power MAPs MAP 3900: Overcurrent on Power Supply 1 2-12 3745 MAPs 2-14 3745 MAPs MAP 3905: Power ON Problem in Host Mode or Host Power Sequence Problem 2-16 3745 MAPs MAP 3910: Overcurrent on Power Supply 2 2-18 Power MAP 3920: Air Flow Detector Fault 3745 MAPs Power MAP 3925: Scheduled Power on Problems 2-20 Power MAP 3930: Power Control Subsystem Problems 3745 MAPs 2-22 3745 MAPs 2-24 Power MAP 3935: Power OFF not Possible in Host Mode 3745 MAPs Power MAP 3945: Power OFF not Possible in Local Mode 2-26 Power MAP 3950: PCC-Detected Error on MOSS Reset 3745 MAPs Power MAP 3960: Power OFF not Possible in Network Mode 2-28 3745 MAPs Power MAP 3970: PCC-Detected Error on CCU Reset or on Remote Power OFF 2-30 3745 LAN MAP MAP 4500: 3745 Models 17A Permanent Console Link Problem 3745 MAPs 3745 Control Panel Code 2-32 manual, chapter "Service Processor Problem Determination". Token-Ring Network Problem Determination Guide Notes: 1. Use the 3745 RSF MAP MAP 4510: 3745 Model 17A Manual Call 3745 MAPs 2-34 Service Processor Installation and Maintenance 3745 MAPs 2-36 3745/3746-900/Service Processor MAPs 2-38 IBM 3746 Nways Multiprotocol Controller Model 900 Service Guide Page MAP 5205: LAN Checking Service Processor MAPs Service Processor MAPs MAP 5600: LAN Problem on the LAN Attached to the Service Processor 2-42 IBM 3746 Nways Multi- protocol Controller Model 900 Service Guide IBM 3746 Nways Multi- protocol Controller Model 950 Service Guide Network Node Processor Installation and Maintenance Service Processor MAPs 2-44 Token-Ring Network Problem Determi- nation Guide Page Chapter 3. How to Run 3745 Diagnostics Diagnostics 3-2 Diagnostic Description 3745 Diagnostics Errors During Diagnostics Diagnostic Monitoring CBA Diagnostic CBA Diagnostics from 3745 MOSS Console: Prerequisites to Run the CBA Test from the 3745 MOSS Diagnostics How to Run MOSS Diagnostics 3-4 From the 3745 Console From the Control Panel How to Loop MOSS Diagnostics Diagnostics How to Run the Console Link Test for 3745 Models 130, 150, 160, and 170 3-6 Local/Remote or Alternate/RSF Link Tests Diagnostics How to Run the Control Panel Test 3-8 How to Run Internal Function Tests How to Invoke Diagnostics: Diagnostics How to Select Diagnostics 3-10 Options Menu Diagnostics Error Menu 3-12 Figure 3-7. ErrorMenu Note: The RH field contains the reference code. How to Run the LIC Wrap Test with IFTs Install the Wrap Plug: Start the Diagnostic Page How to Run the Wrap Test (WTT) for TSS, HPTSS, or 3746-900 Page Option 2: Diagnostics Wrap Test Initial Selection for HPTSS 3-18 Follow the instructions in the following screen. Wrap Test Initial Selection for 3746-900 Diagnostics Available Wrap Options 3-20 ARC Assembly A ARC Assembly B Diagnostics Available Wrap Plugs 3-22 Table 3-3. Wrap Plugs for Testing ARC Assembly B (without Cable) Page Diagnostics 3-24 How to Run the Channel Wrap Test Page Chapter 4. 3745 FRU Exchange Exchange Precautions FRU Exchange List of 3745 FRUs 4-2 FRU Physical Locations 3745 Frame FRU Exchange 4-4 Basic Board, Cards, Connectors, and Crossovers FRU Exchange 4-6 Page Page Page Page MOSS Board, Cards, and Connectors FRU Exchange 4-12 Chapter 4. 3745 FRU Exchange 4-13 LIC Board Type 1 GND Addressing Power Connect GND Location: 01M-A1. 01M-A2. 01L-A2 DMUX LIC Board Type 3 4-14 Figure 4-13. 3745 LIC Unit Type 3 Board and Connectors (for LIC Types 1,3, and 4 in Model 150) DMUX and SMUX Packaging Table 4-3. DMUX Packaging LIC Board Type 1 Packaging for LICs Type 1 to 4 Figure 4-14. 3745 LIC Board 01M-A2 Packaging FRU Exchange Figure 4-15. 3745 LIC Board 01M-A1 Packaging 4-16 Figure 4-16. 3745 LIC Board 01L-A2 Packaging FRU Exchange LIC Board Type 2 Packaging for LIC Type 5 4-18 Figure 4-17. 3745 LIC Board 01L-A2 Packaging (LICs Type 5) Figure 4-18. 3745 LIC Board 01L-A1 Packaging (LIC type 5) LIC Board Type 2 Packaging for LIC Type 6 (Low Speed) Figure 4-19. 3745 LIC Board 01L-A2 Packaging (LICs Type 6 Low Speed) Figure 4-20. 3745 LIC Board 01L-A1 Packaging (LICs Type 6 Low Speed) FRU Exchange LIC Board Type 2 Packaging for LIC Type 6 (High Speed) 4-20 Figure 4-21. 3745 LIC Board 01L-A2 Packaging (LIC Type 6 High Speed) Figure 4-22. 3745 LIC Board 01L-A1 Packaging (LIC Type 6 High Speed) LIC Board Type 3 Packaging for LIC Types 1 to 4 Figure 4-23. 3745 LIC Board 01M-A2 Packaging FRU Exchange Ethernet Lines Tailgate 4-22 Location: 01Q Figure 4-24. 3745 Ethernet Lines Tailgate Table 4-5. 3745 Ethernet Line Locations High Speed Lines Tailgate Figure 4-25. 3745 High-Speed Lines Tailgate Table 4-6. 3745 High-Speed Line Locations Token-Ring Tailgate Channel Tailgate Page Page FRU Exchange 3745 Control Panel 4-28 C1 D1 A1 Page Page Power Supply 1 Front view Rear view Figure 4-36. 3745 Power Supply 1 Components 3745 Power Supply Cross Reference Table 4-9. 3745 Power Supply Cross Reference Power Supply 2 4-32 Location: 01H Figure 4-37. 3745 Power Supply 2 Components Page 3745 FRU Exchange Procedure 3745 FRU Exchange Procedures Card Exchange Procedure 4-34 IBM 3745 Communication Controller Service Function Page 3745 FRU Exchange Procedure 4-36 3745 FRU Exchange Procedure DCREG Exchange Procedure 4-38 DMUX Exchange Procedure 3745 FRU Exchange Procedure DMUX 4-40 IBM 3745 Hardware Maintenance Reference SMUXA/B Exchange Procedure 3745 FRU Exchange Procedure 4-42 IBM 3745 Hardware Maintenance Reference 3745 FRU Exchange Procedure LIC Exchange Procedure 4-44 Connection and Integration Guide Removal Procedure: Connection and Inte- gration Guide, nostic Run or an FRU Exchange on page 4-99. Figure 4-56. LIC Board Type 1 and 2 Figure 4-57. LIC Board Type 3 3745 FRU Exchange Procedure Control Panel Exchange Procedure 4-46 3745 FRU Exchange Procedure Battery Exchange Procedure 4-48 Removal Procedure Installation Procedure Reporting: Page 3745 FRU Exchange Procedure Fan 1 Exchange Procedure 4-50 Fan 2 Exchange Procedure 3745 FRU Exchange Procedure FDD Exchange Procedure 4-52 Removal Procedure: 3745 FRU Exchange Procedure 4-54 3745 FRU Exchange Procedure HDD Exchange Procedure 4-56 Removal Procedure: 3745 FRU Exchange Procedure 4-58 Installation Guide 3745 FRU Exchange Procedure Figure 4-79. HDD Connectors and Jumpers 4-60 Figure 4-80. HDD Connectors and Jumpers TERMC/TERMR Exchange Procedure 3745 FRU Exchange Procedure TERMD/TERMI Exchange Procedure 4-62 3745 FRU Exchange Procedure ESS Tailgate Exchange Procedure 4-64 3745 FRU Exchange Procedure 4-66 PS1 Exchange Procedure 3745 FRU Exchange Procedure 4-68 PS2 and Primary Power Box Exchange Procedure Page Page 3745 FRU Exchange Procedure 4-72 EPO Exchange Procedure Page Page 3745 FRU Exchange Procedure 4-76 Basic Board Exchange Procedure Page 3745 FRU Exchange Procedure 4-80 Page Page 3745 FRU Exchange Procedure LIC Board Type 1 and 3 Exchange Procedure 4-84 Page 3745 FRU Exchange Procedure 4-86 3745 FRU Exchange Procedure LIC Board Type 2 Exchange Procedure 4-88 Removal Procedure: 3745 FRU Exchange Procedure 4-90 3745 FRU Exchange Procedure MOSS Board Exchange Procedure 4-92 3745 FRU Exchange Procedure 4-94 3745 FRU Exchange Procedure Channel Tailgate Exchange Procedure 4-96 3745 FRU Exchange Procedure 4-98 3745 FRU Exchange Procedure IBM 3745 Communication Controller Service Function 4-100 CE leaving procedure CE Leaving Procedure 4-102 IBM 3745 Communication Controller Service Function IBM 3745 Communication Controller Service Function CE leaving procedure 4-104 CA Restore Procedure How to Put the MOSS Online TRA Reconnect Procedure: Page Appendix A. Maintenance Aids Contacting Support Control Program Maintenance Aids MOSS Microcode Maintenance Aids A-2 Scanner Microcode Maintenance Aids Special Tools General Purpose Tools ESD Kit Maintenance Aids Shipping Group Tools A-4 The following tools are shipped with the machine: PKD (Portable Keypad Display) Maintenance Aids for LIC 5 and 6 "3745 Connection and Integration Guide" Configuration: B Commands (Only for LIC Type 5): Manual Tests: Page Appendix B. 3745 Bibliography Service Personnel Definitions Bibliography Customer Documentation for the 3745 (Models 130, 150, 160, 170, and 17A) and 3746 (Model 900) B-2 Online Bibliography B-4 Bibliography Service Documentation for the 3745 (Models 130, 150, 160, 170, and 17A) and 3746 (Model 900) B-6 Online Bibliography B-8 Related Signal Converter Product Information Bibliography Related NCP Service Information B-10 NCP and EP Reference NCP, SSP, and EP Diagnosis Guide NCP and EP Reference Summary and Data Areas List of Abbreviations Abbreviation X-2 Abbreviation X-4 Page Page modem selector channel selector channel Glossary Glossary line adapter X-8 scanner block multiplexer channel, multiplexer channel Readers' Comments We'd Like to Hear from You