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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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VP_LOC

VP_LOC

Description

The VP_LOC alarm indicates loss of continuity check (CC) on the virtual channel (VP). When the CC is enabled but no CC cells are received for more than 3.5s (±0.5s), the VP_LOC alarm is reported. When any CC cell is received, the VP_LOC alarm is cleared automatically.

Attribute

Alarm Severity Alarm Type

Major

Communication alarm

Parameters

Name Meaning

Parameter 1

This parameter is used for the TDM-domain ATM board. The fixed value is 0x01 and the value is meaningless.

This parameter is used for packet-domain ATM boards and E1 interface boards, and indicates connection direction.

  • 0x01: forward
  • 0x02: backward

Parameter 2, Parameter 3

These parameters are used for the TDM-domain ATM board and indicate the connection ID and connection direction.

The value is the remainder of applying the algorithm ((ConnId - 1)×2 + ConnDir)/2048 to connection ID (Connld) and connection direction (ConnDir).

NOTE:
  • ConnDir: the value 1 means forward and the value 2 means backward.
  • ConnId: the value 1 means an odd number and the value 2 means an even number.

Parameter 2 is used for packet-domain ATM boards and E1 interface boards, and indicates segment/end attribute of the alarm.

  • 0x01: segment
  • 0x02: end

Parameter 4

This parameter is used for the TDM-domain ATM board and indicates the group number.

The value is the integer result of applying the algorithm ((ConnId - 1)×2 + ConnDir)/2048 to connection ID (Connld) and connection direction (ConnDir).

NOTE:

The unidirectional connections of the alarm are divided on the 2048 base.

Parameter 5

This parameter is used for the TDM-domain ATM board and indicates the source ATM port number of a certain connection in a certain direction.

  • For the ATM board with the IMA function, the value of this parameter ranges from 0x01 to 0x4A (1 to 74). The values 0x01 to 0x04 (1 to 4) represent external optical port numbers; the values 0x05 to 0x4A (5 to 74) represent internal VCTRUNK numbers.
  • For the ATM board without the IMA function, the value of this parameter ranges from 0x01 to 0x14. The values 0x01 to 0x04 (1 to 4) represent external optical port numbers; the values 0x05 to 0x14 (5 to 20) represent internal VCTRUNK numbers.
NOTE:

Internal VCTRUNK numbers are calculated by applying the algorithm (VCTRUNK ID - 0x8001 + 0x0005) to actual VCTRUNK IDs.

Impact on the System

  • If the CC sink is enabled on the local NE but the local NE does not receive any CC cells, the service connection, though not interrupted, is not loaded with any user service.
  • In other cases, the service is interrupted when the VP_LOC alarm is reported.
  • When the VP_LOC alarm is reported, the system automatically inserts AIS cells to the downstream.
  • The VP_LOC alarm will be suppressed when the VP_AIS alarm is reported.

Possible Causes

Possible causes of the VP_LOC alarm are as follows:

  • The CC sink is enabled on the local NE but no CC source is enabled on the upstream NE. As a result, the local NE does not receive any CC cells.
  • No bandwidth is available on the local NE and the CC cells cannot be received.
  • An upstream SDH path is faulty. As a result, the ATM port connected to the faulty SDH path abnormally receives signals.
  • The LCD alarm is reported on an ATM port on an upstream NE.
  • The board on the local NE is faulty.

Procedure

  1. On the U2000, check whether CC Activate Flag on the local NE is set to Sink activate or Source + sink activate.
    If... Then...

    The CC Activate Flag on the local NE is set to Sink activate or Source + sink activate

    Change CC Activate Flag to Deactivate and check whether the alarm is cleared.

    The CC Activate Flag on the local NE is not set to Sink activate or Source + sink activate

    Go to the next step.

  2. On the U2000, check whether the bandwidth configured to the tunnel is exhausted. For details, refer to the Configuration Guide.
    If... Then...

    The bandwidth configured to the tunnel is exhausted

    Expand the bandwidth of tunnel or eliminate the source that transmits a large amount of illegal data. Then, check whether the alarm is cleared.

    The bandwidth configured to the tunnel is not exhausted

    Go to the next step.

  3. Check whether there is any R_LOS, R_LOF, MS_AIS, AU_AIS or AU_LOP alarm in the upstream SDH path.
    If... Then...

    There is an R_LOS, R_LOF, MS_AIS, AU_AIS or AU_LOP alarm in the upstream SDH path

    Clear the alarm and check whether the VP_LOC alarm is cleared.

    There is no R_LOS, R_LOF, MS_AIS, AU_AIS or AU_LOP alarm in the upstream SDH path

    Go to the next step.

  4. Check whether there is any LCD alarm on the upstream NE and specific port.
    If... Then...

    There is an LCD alarm on the upstream NE and specific port

    Clear the LCD alarm and check whether the VP_LOC alarm is cleared.

    There is no LCD alarm on the upstream NE and specific port

    Go to the next step.

  5. Reset (cold) the board that reports the VP_LOC alarm.
  6. Replace the board that reports the VP_LOC alarm.

Related Information

None.

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Updated: 2019-01-21

Document ID: EDOC1100020975

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