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S12700 V200R010C00 Configuration Guide - Device Management

This document describes the principles and configurations of the Device Management features, and provides configuration examples of these features.
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Configuring Attributes of the S1 Byte

Configuring Attributes of the S1 Byte

Context

A multiframe transmitted between BITS interfaces consists of eight sub-multiframes. Each sub-multiframe contains five spare bits, namely, SA4 bit to SA8 bit. You can select any one of the spare SA bits to transmit the SDH synchronization code (S1 byte). The eight sub-multiframes jointly carry the eight bits of the S1 byte.

You can specify the SA bit that is used to transmit the S1 byte.

In special scenarios, you need to manually set the S1 byte that an interface sends to adjust the SSM.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    clock recv-sa-bit { sa4 | sa5 | sa6 | sa7 | sa8 } { bits0 | bits1 }

    The bit of the SA bits from which the SDH synchronization status code (S1 byte) is received is specified.

    By default, the S1 byte is transmitted in the SA4 bit.

    NOTE:

    If the sender and the receiver are of the same model, you do not need to perform this step because the device can identify the S1 byte no matter which bit transmits it.

    This step is performed when the device synchronizes the clock with another type of device through the BITS interface. In this case, you need to specify the same bit that transmits the S1 byte on both ends to ensure that both ends can identify the S1 byte.

  3. Run:

    clock send-sa-bit { sa4 | sa5 | sa6 | sa7 | sa8 } { bits0 | bits1 }

    The bit of the SA packet that is used to transmit the SDH synchronization status code (S1 byte) is specified.

    By default, the S1 byte is transmitted in the SA4 bit.

  4. Run:

    clock force-out-s1 { s1-prc | s1-ssu-t | s1-ssu-l | s1-sec | s1-dnu | else-s1-byte } { bits0 | bits1 }

    The content of the S1 byte sent from the BITS0 or BITS1 interface is set.

    By default, the S1 byte is set automatically according to the SSM level of the selected clock source.

  5. Run:

    interface interface-type interface-number

    The interface view is displayed.

  6. Run:

    clock force-out-s1 { s1-prc | s1-ssu-t | s1-ssu-l | s1-sec | s1-dnu | else-s1-byte }

    The content of the S1 byte sent from the interface is set.

    By default, the S1 byte is set automatically according to the SSM level of the selected clock source.

Translation
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Updated: 2019-08-21

Document ID: EDOC1000142080

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