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Documation, Inc.
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DEREP Ethernet Repeater Technical Manual
Company:
Digital Equipment Corporation
Part:
EK-DEREP-TM-001
Date:
1984-04
Table of Contents
Chapter 1
Introduction
1.1
Functional Description
1.1.1
Local Repeater
1.1.2
Remote Repeater
1.1.3
Operator Interface
1.2
Physical Description
1.2.1
Local Repeater
1.2.2
Remote Repeater
1.3
Physical Specifications
1.4
Environmental Specifications
1.5
Electrical Specifications
1.6
Performance Specifications
Chapter 2
Installation
2.1
Introduction
2.2
Typical Installation
2.3
Preinstallation Considerations
2.4
Unpacking and Inspection
2.5
Installation
2.5.1
Local Repeater Installation
2.5.2
Remote Repeater Installation
2.6
Installation Testing
2.6.1
Internal Self-Test
2.6.2
External Self-Test
2.6.3
Executing the Repeater Self-Test
2.7
Installing Standby Repeaters
2.7.1
Standby Repeater Installation
2.7.2
Testing the Standby Function of the Standby Repeater
Chapter 3
Theory of Operation
3.1
Scope
3.2
Definitions
3.3
Repeater States
3.4
Repeater Operation
3.4.1
Carrier
3.4.2
CPT (Collision Presence Test)
3.4.3
Collisions
3.5
Segmentation
3.5.1
Autosegmentation
3.5.2
Exit from Segmentation
3.6
Standby Mode
3.6.1
Active Standby Repeaters
3.6.2
Standby Repeaters Reentering the Passive State
3.7
Self-Test
3.7.1
Internal Self-Test
3.7.2
External Self-Test for Local Repeaters
3.7.3
External Self-Test for Remote Repeaters
Chapter 4
Technical Description
4.1
Scope
4.2
The Data Structure
4.3
Functional Block Description
4.3.1
Assumptions
4.3.2
Typical Data Flow
4.4
Circuit Descriptions
4.4.1
Data Path Circuits
4.4.1.1
Transceiver Interfaces
4.4.1.2
Fiber-Optic Interface
4.4.1.3
Collision Circuits
4.4.1.4
CPT Detect
4.4.1.5
B Interface Select Multiplexer
4.4.1.6
Receive Multiplexer
4.4.1.7
Manchester Data Decoder
4.4.1.8
FIFO
4.4.1.9
FIFO I/O Address Comparator
4.4.1.10
Slot-Time Counter
4.4.1.11
Preamble Generator
4.4.1.12
EOP (End-of-Preamble) Detect
4.4.1.13
Transmit Multiplexer
4.4.1.14
XMT Data Encoder (Manchester Encoder)
4.4.1.15
XMT (Transmit) Enable
4.4.2
Control Circuits
4.4.2.1
Master Oscillator and Clock Generator
4.4.2.2
Input Synchronizer
4.4.2.3
State Machine
4.4.2.4
Jam Counter
4.4.2.5
Go Counter
4.4.2.6
Display Indicators and Drivers
4.4.2.7
Power-up Reset
4.4.2.8
Power Supply
Chapter 5
Maintenance
5.1
Scope
5.2
Maintenance Philosophy
5.2.1
Required Equipment
5.2.2
Optional Equipment
5.3
Preventive Maintenance (PM)
5.3.1
Internal Self-Test
5.3.2
External Self-Test
5.3.3
Executing the Repeater Self-Test
5.4
Corrective Maintenance
5.4.1
Troubleshooting Tips
5.4.2
Repeater LED Indications
5.4.3
Self-Test Errors and Troubleshooting
5.5
Repeater Disassembly
5.5.1
Opening and Closing the Repeater
5.5.2
Opening and Closing the Internal Metal Chassis
5.5.3
Fiber-Optic Module Removal and Replacement
5.5.4
Logic Module Removal and Replacement
5.5.5
Power Supply/Fan Removal and Replacement
Appendix A
Fiber-Optic Link Certification
A.1
Introduction
A.2
Fiber-Optic Link Certification
A.3
Requirements
A.3.1
Cable Requirements
A.3.2
Required Equipment
A.4
Certification Procedure
A.4.1
Loss Calculation Formula
A.4.2
FOTDR Procedure
A.4.2.1
Equipment Setup
A.4.2.2
Cable Measurement
A.5
Possible Problem Sources
A.6
Recording the Results
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