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1
Introduction
1–1. Setting Up the MLX-20L Console
1-2. Setting Up the PC
1-3. External Modem Setup
1-4. The SPM Display
1–5. Removing the Control Unit Housing
1–6, Disconnecting AC Power
1-7. Maintenance Strategy
4
Control Unit Problems
4–2. Replacing a Ring Generator
4-3. Replacing an Auxiliary Power Supply
4–4. Inserting a Memory Card
4-5. Replacing the Feature Module
4–6. Module Test Process
4-7. Inserting the Upgrade Memory Card
4–8. 551 T1 CSU Loopback Connection
4–9. ESF T1 CSU DTE Loopback Connection
4-10. Acculink 3150 CSU Front Panel
4-11. Acculink 3150 CSU DTE Loopback Commands 1
4-12. Acculink 3150 CSU DTE Loopback Command 2
4-13. Acculink 3150 CSU DTE Loopback Command 3
4-14. Acculink 3150 CSU DTE Loopback Command 4
1-4
1-5
1-7
1-12
1-17
1-18
1-19
4-7
4-9
4-20
4-32
4-34
4-62
4-74
4-74
4-75
4-75
4-76
4-76
4-77
Maintenance and Troubleshooting vii