Appendix D | System Messages |
This appendix lists and defines the alarm and status messages that appear on the TSU 120 screen.
ALARM MESSAGES
Network Interface (NI)
Red Alarm NI unable to frame align with incoming signal
Yellow Alarm Remote alarm indication (RAI) being received from far end
Blue Alarm Unframed all ones (1s) (AIS) being received at NI Loss of Signal No signal detected at NI
Nx56/64 Interface
The following messages indicate an alarm condition on the
Nx56/64 card:
Clock Slip | Difference in frequency of the data clock at the |
| network and DTE |
PLL Alarm | Unable to achieve |
| clock provided by the network interface. |
Zeros Alarm | All zeros (0s) data being sent toward the network |
| interface |
No EXT Clock | No external transmit clock at DTE (only appears |
| if EXT CLK is selected) |
TSU 120 User Manual |