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22 Chapter 3 Hardware Troubleshooting
NN40160-700NN40160-700
Figure 2 MBM LEDs
The table MBM LED descriptions on page 22 describes the possible MBM LED states.
DTM LEDs
The DTM has additional LEDs that are not on most other MBMs. The figure DTM LEDs on page
23 shows the location of the DTM LEDs.
Table 3 MBM LED descriptions
Power Status Description
Off Off The MBM has no power, or a failure occurred on the MBM power converter.
On Off BCM450 to expansion unit failure or system initialization.
On Blinking Hardware is working, but an operational problem exists such as:
• no link to the main unit is detected
• frame alignment is lost on messages from the main unit
• bandwidth not allocated
• MBM is in maintenance state
• MBM is in download state (GASM, GATM4/GATM8)
Blinking Blinking The MBM has power, but a hardware problem exists such as:
• partial failure of power converter
• thermal overload
• fan failure
On On The MBM is ready to operate.
Power Status