TCM Overhead

In this user interface, you can set Tandem Connection Monitoring (TCM) overhead bytes and relevant parameters.

Navigation Path

In the NE Explorer, click a board and choose Configuration > OTN Overhead Management > TCM Overhead from the Function Tree.

Buttons

Button

Description

Display in Text Format

Enables the text format display of overhead bytes.

Display in Hexadecimal

Enables the hexadecimal display of overhead bytes.

Shortcut Menu

Select an object from the object list, right-click the field of its TTI to Be Sent or TTI to Be Received parameter, and choose Copy All From Received or Manual Input from the shortcut menu.

Shortcut Menu

Description

Copy All From Received

Copies the overhead bytes to be received to improve work efficiency.

Manual Input

Displays the Overhead Byte dialog box to enter overhead bytes in it.

NOTE:

When setting overhead bytes in text mode, use only ASCII characters.

Parameters

Field

Value

Description

Object

  • Equipment that supports the master and slave shelf management: NE name-shelf ID(shelf name)-slot number-board name-port number(port name)(-monitoring level)
  • Equipment that does not support the master and slave shelf management: NE name-slot number-board name-port number(port name)(-monitoring level)
NOTE:

For details about the differences between the standard and compatibility modes, see the Impacts of the Standard Mode on the Web LCT in Channel Model (OTU, Line or PID Board).

Displays the object that the TCM overhead monitors.

Level

TCM1, TCM2, TCM3, TCM4, TCM5, TCM6

Displays the TCM layer.

You can divide the services into layers for management.

TCM Status

Unused, Used, Reserved, LCK, OCI, AIS

Displays the current status of the TCM layer.

Source Mode

Transparent Mode, Operation Mode

Default: Transparent Mode

The Source Mode parameter specifies the mode that the TCM source end uses to process the TCM overhead of the transmitted OTN signal.

Sink Mode

Transparent Mode, Operation Mode, Monitoring Mode

Default: Transparent Mode

The Sink Mode parameter specifies the mode for processing the TCM overhead of the downstream station.

TIM Mode

Only SAPI, Only DAPI, SAPI&DAPI, No Detection

Default: No Detection

The TIM Mode parameter is used to set the mode for detecting the OTN trail trace identifier (TTI).

Source Enable Status

Enabled, Disabled

Default: Disabled

The Source Enable Status parameter specifies the state of the source end of the TCM layer. In this way, the system determines whether to monitor the TCM overhead of the transmitted OTN signals based on the specified TCM mode.

Sink Enable Status

Enabled, Disabled

Default: Disabled

The Sink Enable Status parameter specifies the state of the sink end of the TCM layer. In this way, the system determines whether to monitor the TCM overhead and alarms based on the specified TCM Mode.

TTI to Be Sent

64 characters

Default: None

The TTI to Be Sent parameter is used to set the trail trace identifier (TTI) that should be sent of the OTN path monitoring overhead layer.

TTI to Be Received

A string of 64 characters

Default: None

The TTI to Be Received parameter is used to define the TTI to be received at the receive end. The trail trace identifier (TTI) is a string of 64 characters, including 15 characters used as the source access point identifier, 15 characters used as the sink access point identifier, two characters of 0s, and 32 characters that are defined by carriers.

NOTE:

Right-click the field of the TTI to be Sent or TTI to be Received parameter and choose Copy All From Received from the shortcut menu to copy the overhead bytes to be sent or received. This will improve the work efficiency.

TTI Received

A string of 64 characters

Default: None

The TTI Received parameter specifies the TTI from the upstream NE that the local NE actually receives.

NOTE:

The value of TTI Received must be the same as the value of TTI to be Received. Otherwise, an ODUk_PM_TIM alarm is reported.

LCK Insertion

Enabled, Disabled

Default: Disabled

Sets whether to turn on the LCK insertion function.

When the function is Enabled, an LCK signal is inserted to the downstream for locking the signal of the user access point. This function is often used by carriers for a test.

NOTICE:
Configuring the parameter LCK Insertion as Enabled may interrupt service.

Threshold-Crossing Threshold

1.0E-3, 1.0E-4, 1.0E-5

Default: 1.0E-3

The Threshold-Crossing Threshold parameter specifies the threshold of the signal BER for generating a BER threshold crossing alarm.

Degrade Threshold

1.0E-5, 1.0E-6, 1.0E-7, 1.0E-8, 1.0E-9

Default: 1.0E-6

The Degrade Threshold parameter specifies the degrade threshold of the BIP8 BER.

Config TCM Ason Alarm

Enabled, Disabled

Specifies whether to support TCM alarms for ASON trails. This parameter applies to the ASON trails that traverse third-party NEs.

Non-Intrusive Monitoring

Enabled, Disabled

Default: Disabled

The Non-Intrusive Monitoring parameter provides an option for enabling or disabling the non-intrusive monitoring.

DEG Threshold

1.25G: 1-10167; Default: 1.25G: 3050

2.5G: 1-20420; Default: 2.5G: 6126

5G: 1-41012; Default: 5G: 12303

10G: 1-82025; Default: 10G: 24607

40G: 1-329491; Default: 40G: 98847

100G: 1-856387; Default: 100G: 256916

The DEG Threshold parameter specifies the degrade threshold. If BIP8 BER exceeds the degrade threshold during a specified detection period, the system assumes that a BER threshold crossing event occurs in that period. One second is a detection period. If BER exceeds the degrade threshold continuously during the specified detection period, the ODUk_TCMn_DEG alarm is reported.

DEG Detection Time

1-10

Default: 7

The DEG Detection Time parameter indicates that the ODUk_TCMn_DEG alarm is reported when the DEG errors exceed the threshold continuously during the time as specified by the parameter (1s as one detection period).

BIP8 Detection Mode

Poisson, Bursty

Default: Vary with different boards

The BIP8 Detection Mode parameter specifies the mode for detecting BIP8 errors.

Enable TIM Response

Disabled, Enabled

Default: Disabled

Sets whether to enable the TIM follow-up response or not. When a TIM alarm is generated at this end, an AIS alarm is inserted to services in the downstream direction. This interrupts the services in the downstream direction.

Enable LTC Response

Disabled, Enabled

Default: Disabled

Sets whether to enable the LTC follow-up response or not.

DEG Detection Time Window(ms)

10, 100, 1000

Default: 1000

Set the interval time silce of DEG.


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