Troubleshooting guide

Contents
v
Cisco Broadband Local Integrated Services Solution Troubleshooting Guide
Version 1
CHAPTER 4 Troubleshooting with Call Flows 4-1
Understanding MGCP 4-2
MGCP Transactions 4-2
Understanding SS7 4-10
Processing a Telephone Call 4-10
ISUP Signaling Messages 4-11
Call Flow Analysis 4-13
MGCP Key Fields 4-13
MGCP Message Correlation 4-13
Call Flow Problems 4-15
Voice Quality Problems 4-22
Lost or Distorted Audio 4-23
Voice Network Troubleshooting Procedures 4-24
CHAPTER 5 Troubleshooting DOCSIS Networks 5-1
DOCSIS 1.0+ 5-1
Understanding Initialization States 5-3
Physical and MAC Configuration 5-3
Network Layer Configuration And Above 5-6
Radio Frequency (RF) Issues 5-9
Troubleshooting RF Problems 5-10
Troubleshooting Tools 5-10
Measuring RF Signals 5-11
Measuring Downstream IF and RF 5-11
Comparing Measurements to Recommended Settings 5-15
Measuring Upstream RF Signals 5-17
Troubleshooting Slow Peformance 5-17
Hardware and Software Versions 5-17
Determining Levels of Performance 5-17
Potential Reasons for Poor Performance 5-21
High CPU Utilization on the CMTS 5-30
Conclusion 5-32