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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Difference Between Alarm Signals of PDH Ports at Various Rates

Difference Between Alarm Signals of PDH Ports at Various Rates

The flow of processing 34 Mbit/s or 140 Mbit/s PDH services is the same as the flow for processing 2 Mbit/s PDH services. This section describes the differences between the processing flows of 2 Mbit/s and 34/140 Mbit/s alarm signals.

Same Type of Alarms with Different Names

Table 1-1 lists the differences between 2 Mbit/s and 34/140 Mbit/s alarm signals.

Table 1-1  Same type of alarms with different names
Board Condition Alarm
2 Mbit/s electrical PDH Board External signal loss occurs. T_ALOS
34 Mbit/s electrical PDH Board P_LOS
140 Mbit/s electrical PDH Board EXT_LOS
2 Mbit/s electrical PDH Board Signals in the downlink signal flow are all "1"s. UP_E1AIS and DOWN_E1AIS
34 Mbit/s electrical PDH Board P_AIS
140 Mbit/s electrical PDH Board C4_R_LAISD
140 Mbit/s electrical PDH Board Signals in the uplink signal flow are all "1"s. C4_T_LAISD
NOTE:

An EXT_LOS alarm can cause a C4_T_LAISD alarm.

Different Path Overhead Bytes for Alarm and Performance Event Monitoring

The path overhead bytes that are used in the 34 Mbit/s and 140 Mbit/s PDH Boards are B3, J1, C2 and G1.

The B3 byte uses the even BIP-8 code for error monitoring. The function of the B3 byte is the same as that of bits 1-2 of the V5 byte.

The function of the J1 byte is the same as that of the J2 byte.

The C2 byte is the signal label byte and has the same function as bits 5-7 of the V5 byte. The G1 byte is used to generate the alarm reply.

Figure 1-6 shows the structure of the G1 byte.

Figure 1-6  Structure of the G1 byte

The definition of bits 1-4 of the G1 byte is as follows:
  • 0000-1000: indicates that there are 0 to 8 errors respectively.
  • 1001-1111: indicates that there are no errors.
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Updated: 2019-01-21

Document ID: EDOC1100020975

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