Troubleshooting guide

Section 1, System Description - System Components
61186003L1-1D 1-13
NOTE
The MX2820 has two power options: –48VDC or ±24 VDC. The
Clock Card operates at –48VDC only. Do not deploy a ±24 VDC
system if Clock Cards are deployed for STS-1 MUX timing.
Clock Card Front Panel LEDs
Table 1-3 provides a description of the front panel LED.
Table 1-3. MX2820 Clock Card Front Panel LEDs
LED State Description
LED Status for Active Clock Card
ACT
Green
Flashing Amber
Red
Amber
Red (Slow Flashing)
Red (Fast Flashing)
Normal (all OK)
Console open
Major or minor alarm present
Software update in progress
Clock Card has failed
Critical alarm present
LED Status for Standby Clock Card
ACT
Flashing Green
Amber
Flashing Red
Normal (all OK)
Software update in progress
Self-test failure