Monitoring System Activity and PerformanceLTPH-UM-1109-01, Issue 1
Table 11. DS1 Alarm Descriptions
| Screen | Front-Panel | Description |
| Alarm | Alarm |
| |
H2TU-C DS1 ALARMS (see Figure 21 on page 33)
LLOS (a) | LLOS | Line (Unit) Loss of Signal—Loss of the H2TU-C DSX-1 input signal. |
LAIS (a) | LAIS | Line Alarm Indication Signal—Indicates an AIS (unframed all ones) pattern is being received at the |
| | H2TU-C DS1 input port. |
DBER | xxx-DBER | Bit Error Rate—The DS1 BER has exceeded the built-in 24-hour threshold limits of approximately |
| | 10-6. (xxx denotes either TUC or TUR.) |
LOF | LOF | Loss of Frame—Indicates the incoming DS1 payload does not contain the specific frame pattern, |
| | ESF or SF, selected by the FRMG option. Only occurs if the FRMG option is set to SF or ESF. |
| | |
H2TU-R DS1 ALARMS (see Figure 22 on page 33)
RLOS (b) | RLOS | Remote (Unit) Loss of Signal—Loss of the H2TU-R DS1 input signal. |
RAIS | RAIS | Remote Alarm Indication Signal—Indicates an AIS (unframed all ones) pattern is being received at |
| | the H2TU-R DS1 input port. By default (see Figure 26 on page 42) AIS-CI (b)is sent towards the |
| | network. |
RAI | RRAI | Remote RAI - Remote Alarm Indication at the H2TU-R—Indicates an RAI alarm (yellow) from the |
| | CPE with errors from the line unit or network. |
LRAI | LRAI | Line (Unit) RAI - Remote Alarm Indication at the H2TU-R—Indicates an RAI alarm (yellow) from the |
| | CPE with an error-free signal from the line unit or network. RAI signal is transmitted towards the |
| | network. |
PRM-NE | PRMN | Performance Report Messaging - Near End—The count of the PRM-NE register at the H2TU-R |
| | exceeds the 10-6BER threshold at 648 events since 12:00:00 AM. |
PRM-FE | PRMF | Performance Report Messaging - Far End—The count of the PRM-FE register at the H2TU-R exceeds |
| | the 10-6BER threshold at 648 events since 12:00:00 AM. |
DBER | xxx-DBER | Bit Error Rate—The DS1 BER has exceeded the built-in 24-hour threshold limits of approximately |
| | 10-6. (xxx denotes either TUC or TUR.) |
LOF | LOF | Loss of Frame—Indicates the incoming DS1 payload does not contain the specific frame pattern, |
| | ESF or SF, selected by the FRMG option. Only occurs if the FRMG option is set to SF or ESF. |
| | |
(a)Issues a minor alarm (sent to the management unit or the backplane), if enabled.
(b)AIS-CI is a modified AIS alarm pattern. Equipment not suited to detect AIS-CI still detects this signal as an AIS. AIS-CI is sent toward the network indicating that an LOS (RLOS) or AIS (RAIS) has been received from the CPE.
34 | January 9, 2002 | H2TU-C-231 List 2 |