DMV11 Synchronous Controller User's Guide

Company:	Digital Equipment Corporation
Part:	EK-DMV11-UG-001
Date:	1981-09

Chapter 1 Introduction
- 1.1 Introduction
- 1.2 Introduction to Multipoint
- 1.3 DMV11 General Description
- 1.4 Standard Applications
- 1.5 DMV11 System Operation
- 1.6 Command/Response Structures
  - 1.6.1 Input Commands
  - 1.6.2 Output Responses
- 1.7 Protocol Support
  - 1.7.1 Data Messages
  - 1.7.2 Control Messages
  - 1.7.3 Maintenance Messages
- 1.8 General Specifications
  - 1.8.1 Environmental Specifications
  - 1.8.2 Electrical Specifications
  - 1.8.3 Performance Specifications
Chapter 2 Installation
- 2.1 Introduction
- 2.2 Unpacking and Inspection
- 2.3 Installation Considerations
- 2.4 Preinstallation Considerations
  - 2.4.1 Device Placement
  - 2.4.2 System Requirements
- 2.5 Installation
- 2.6 DMV11 System Testing
  - 2.6.1 Functional Diagnostic Testing
  - 2.6.2 DEC/X11 System Exerciser
  - 2.6.3 Final Cable Connections
  - 2.6.4 DMV11 Link Testing
Chapter 3 Command and Response Structures
- 3.1 Introduction
- 3.2 Command Structure
  - 3.2.1 Control and Status Registers
  - 3.2.2 Input Commands Overview
  - 3.2.3 Output Responses Overview
- 3.3 DMV11 Input Commands
  - 3.3.1 Microprocessor Control/Maintenance Command
  - 3.3.2 Mode Definition Command
  - 3.3.3 Control Command
  - 3.3.4 Buffer Address/Character Count (BA/CC) Command
- 3.4 DMV11 Output Responses
  - 3.4.1 Buffer Disposition Response
  - 3.4.2 Control Response
  - 3.4.3 Information Response
- 3.5 TSS/GSS Access
Chapter 4 Programming Techniques
- 4.1 Introduction
- 4.2 Command/Response Discipline and Handshaking
  - 4.2.1 Command Discipline
  - 4.2.2 Retrieving Responses
  - 4.2.3 CSR Interface Interactions
- 4.3 DMV11 Start-Up
  - 4.3.1 Configuration Procedure
  - 4.3.2 Specifying User-Defined Parameters
    - 4.3.2.1 Specifying TSS Parameters
    - 4.3.2.2 Specifying GSS Parameters
  - 4.3.3 Protocol Operation
- 4.4 Criteria for Determining Communications Link Parameters
  - 4.4.1 Setting the Selection Interval Timer
  - 4.4.2 Setting the Babbling Tributary Timer
  - 4.4.3 Setting the Streaming Tributary Timer
- 4.5 Error Counter Access
  - 4.5.1 Reading the Counters
  - 4.5.2 Counter Skew
- 4.6 Error Recovery Procedures
  - 4.6.1 Recovery from Network Errors
    - 4.6.1.1 Recovery from Threshold Errors
    - 4.6.1.2 Recovery from Babbling and Streaming Tributary Errors
  - 4.6.2 Recovery from Procedural Errors
    - 4.6.2.1 Recovery from a Nonexistent Memory Error
    - 4.6.2.2 Recovery from a Receive Buffer Too Small Error
    - 4.6.2.3 Recovery from a Queue Overflow Error
- 4.7 Booting a Remote Station
  - 4.7.1 Steps Leading to a Remote Load Detect Boot
  - 4.7.2 Steps Leading to a Power-On Boot
  - 4.7.3 Steps Leading to an Invoke Primary MOP Boot
  - 4.7.4 DMV11 Switch Settings for the Boot Functions
    - 4.7.4.1 Switch Settings for the Power-On Boot Function
    - 4.7.4.2 Switch Settings for the Invoke Primary MOP Boot Function
    - 4.7.4.3 Switch Settings for the Remote Load Detect Boot Function
- 4.8 Maintenance Register Emulation
Chapter 5 Aspects of DMV11 Microcode Operation
- 5.1 Introduction
- 5.2 DMV11 Polling Algorithm
  - 5.2.1 Calculating Polling Urgency
  - 5.2.2 Criteria for Determining Polling Parameters
    - 5.2.2.1 Determining a Value for DELTA T
    - 5.2.2.2 Determining Values for Q and R
    - 5.2.2.3 Determining a Value for Poll Delay
    - 5.2.2.4 Determining a Value for DEAD T
- 5.3 Error Counters
  - 5.3.1 Data Link Error Counters
    - 5.3.1.1 Data Errors Outbound
    - 5.3.1.2 Data Errors Inbound
    - 5.3.1.3 Local Reply Timeout
    - 5.3.1.4 Remote Reply Timeouts
    - 5.3.1.5 Local Buffer Errors
    - 5.3.1.6 Remote Buffer Errors
    - 5.3.1.7 Selection Timeouts
    - 5.3.1.8 Data Messages Transmitted
    - 5.3.1.9 Data Messages Received
    - 5.3.1.10 Selection Intervals
  - 5.3.2 Station Error Counters
    - 5.3.2.1 Remote Station Errors
    - 5.3.2.2 Local Station Errors
    - 5.3.2.3 Global Header Block-Check Errors
    - 5.3.2.4 Maintenance Data Field Block-Check Errors
  - 5.3.3 Threshold Error Counters
    - 5.3.3.1 Transmit Threshold Errors
    - 5.3.3.2 Receive Threshold Errors
    - 5.3.3.3 Selection Threshold Errors
- 5.4 DMV11 Microcode Internal Data Base Overview
  - 5.4.1 Linked Lists
    - 5.4.1.1 The Free Linked List
    - 5.4.1.2 The Response Linked List
    - 5.4.1.3 Buffer Linked Lists
  - 5.4.2 Slot Mapping Table
  - 5.4.3 TSS and GSS Structures
    - 5.4.3.1 The Global Status Slot (GSS)
    - 5.4.3.2 Tributary Status Slots (TSS)
Appendix A DDCMP in a Nutshell
- A.1 DDCMP
  - A.1.1 Controlling Data Transfers
  - A.1.2 Error Checking and Recovery
  - A.1.3 Character Coding
  - A.1.4 Data Transparency
  - A.1.5 Data Channel Utilization
- A.2 Protocol Description
- A.3 Message Format
Appendix B Floating Device and Vector Addresses
- B.1 Floating Device Addresses
- B.2 Floating Vector Addresses
- B.3 Examples of Device and Vector Address Assignment
Appendix C Modem Control Register Formats
- C.1 Modem Control Register Formats
- C.2 RS-449 Versus RS-232-C
Appendix D Modem Control
- D.1 Modem Control
  - D.1.1 Hardware Modem Control
  - D.1.2 Modem Control Implemented by the DMV11 Microcode

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DMV11 Synchronous Controller User's Guide

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