User guide

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Table of Contents xi
The DSU/CSU System does not Dial Out when an Alarm Occurs 6-17
There is no FDL Communication with the Remote/far End System 6-17
The ESF User Registers do not Clear from the Network Carrier 6-17
Current Tests Terminate without your Intervention 6-18
The System Cannot be put into Network Loopback from the Carrier 6-18
The System cannot be Put into Payload Loopback from the Network 6-18
The NET LED does not Illuminate 6-19
The NET LED is Constantly Red 6-19
The NET LED Remains Constant Amber/yellow 6-19
The NET LED Flickers Intermittently between Red, Amber, and Green 6-20
The Data Port TD/RD LEDs do not Illuminate 6-20
The Data Port RTS/CTS LEDs do not Illuminate 6-21
The DTE Device Shows Intermittent Errors 6-21
LEDs do not Illuminate 6-22
After Powerup, the Menu Clock no Longer Shows Correct Time or Date 6-22
Troubleshooting the Terminal Interface 6-22
No Response from any DSU/CSU on the Communication Network 6-23
No Response from Some DSU/CSUs on the Network 6-23
Invalid Data is Received from One or All DSU/CSUs on the Network 6-23
Invalid Data is Received with a Mostly Good Menu Display 6-24
Additional Troubleshooting Tips 6-24
Running Loopbacks 6-24
Running the Pattern Test 6-25
Appendix A, Technical SpeciÞcations A-1
Network Interface A-1