Specifications

Error Detection 6-1
Chapter 6
Troubleshooting and
Diagnostics
This chapter describes the ASMi-52 diagnostic functions, which include:
• Status indications, alarms, power-up self-test
• Statistics collection
• Diagnostic tests (loopbacks and LEDs test).
6.1 Error Detection
Power-Up Self-Test
ASMi-52 performs a hardware self-test upon turn-on. The self-test sequence
checks the critical circuit functions of the modem.
The results of the hardware self-test for the local or remote ASMi-52 are displayed
in the System Status and Physical Status Port screens (see Chapter 4).
Front Panel LEDs
The status of ASMi-52 is indicated by the ALM, TST and SYNC LED indicators
located on the front panel. For the description of LEDs and their functions, refer to
Chapter 3.
Displaying Alarms
ASMi-52 detects fault conditions and initiates alarms to alert the user. ASMi-52
supports the following alarm types:
• System alarms, relating to the ASMi-52 chassis
• Port alarms, relating to a specific interface (SHDSL or DTE)
• Information messages (warnings)
• Events that trigger alarm activation.
ASMi-52 maintains two separate displays for the system and port alarms. In
addition, the modem supports a local log file, holding up to 100 alarms.
An alarm or warning enters simultaneously both the alarms display and the log file,
and the ALM LED turns on to indicate the condition. When the fault condition that
caused the alarm is cleared, the alarm is removed from the alarm screen, but it