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LOS

 

Table 1: Alarm Details

Parameter

Description

Code

los

Description

Loss of Signal: The local port has detected a loss of received signal power.

Entities Affected

  • Optical channel interfaces

  • OTN OTU interfaces

  • Ethernet interfaces

  • SONET/SDH interfaces

  • Wavelength channels

  • Fibre channel interfaces

See respective tables below.

Possible Causes

  • The fiber input is disconnected.

  • The far-end interface is not yet provisioned.

  • The far-end transmit laser is disabled or has failed.

Default Severity

Critical

Service Affecting

Yes (true).

Alarm Clearing

See Clearing an LOS Alarm.

Related Fault Hierarchy

See:

Table 2: Optical Channel Interfaces

Entity Name

 

Fault Indicator

Module

Indicator

Status

och:<chassis>/<slot>/<2>/<1>/<subport.och>

UFM6

Fault LED, 200G line port

On

Table 3: OTN OTU Interfaces

Entity Name

 

Fault Indicator

Module

Indicator

Status

otu4:<chassis>/<slot>/<1>/<1>

UFM4

Fault LED, 100G line port

On

otu4:<chassis>/<slot>/<subslot>/<port>

1x CFP BIC

Fault LED, 100G port

otu2:<chassis>/<slot>/<subslot>/<port>

12x SFP+ BIC

Fault LED, 10G port

otu2e:<chassis>/<slot>/<subslot>/<port>

Note: Supported on UFM3 only.

Table 4: Ethernet Interfaces

Entity Name

 

Fault Indicator

Module

Indicator

Status

100ge:<chassis>/<slot>/<subslot>/<port>/<subport>

1x CFP BIC

Fault LED, 100G port

On

100ge:<chassis>/<slot>/<1>/<port>

UFM6

Fault LED, 10/40/100G port

40ge:<chassis>/<slot>/<1>/<port>

UFM6

Fault LED, 10/40/100G port

10ge:<chassis>/<slot>/<1>/<port>/<subport>

UFM6

Fault LED, 10/40/100G port

10ge:<chassis>/<slot>/<subslot>/<port>/<subport>

12x SFP+ BIC

Fault LED, 10G port

Table 5: SONET/SDH Interfaces

Entity Name

 

Fault Indicator

Module

Indicator

Status

oc192:<chassis>/<slot>/<subslot>/<port>

12x SFP+ BIC

Fault LED, 10G port

On

wanoc192:<chassis>/<slot>/<subslot>/<port>

stm64:<chassis>/<slot>/<subslot>/<port>

wanstm64:<chassis>/<slot>/<subslot>/<port>

Table 6: Wavelength Channels

Entity Name

 

Fault Indicator

Module

Indicator

Status

channel:<chassis>/<slot>/<subslot>/<port.channel>

1x CFP BIC1

Fault LED, 100G port

On

1 Monitoring and reporting of this alarm for a wavelength channel is supported only on multiwavelength CFP transceivers.

Table 7: Fibre Channel Interfaces

Entity Name

 

Fault Indicator

Module

Indicator

Status

8gfc:<chassis>/<slot>/1/<port>/subport

UFM6

Fault LED, 10-Gbps port

On

10gfc:<chassis>/<slot>/1/<port>/subport

UFM6

Fault LED, 10-Gbps port

On

Clearing an LOS Alarm

Note

Follow all applicable safety requirements as described in the BTI7800 Series Hardware Overview and Installation Guide.

  1. Inspect the fiber connection, and ensure that the fiber is intact, thoroughly clean, and correctly connected to the port.
  2. Ensure that the light path on the optical line system, if it exists, is correctly provisioned and fault free.
  3. Check for and resolve the following problems:
    • The far-end transmitter is disabled or has failed.

    • The far-end interface is not provisioned.

  4. Check for alarms on the local interface
    • If the alarm has cleared, you have completed this procedure.

    • If the alarm does not clear, contact your next level of support.