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NE40E-M2 V800R010C10SPC500 Configuration Guide - WAN Access 01

This is NE40E-M2 V800R010C10SPC500 Configuration Guide - WAN Access
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Enabling the Payload Scramble Function on a Serial Interface

Enabling the Payload Scramble Function on a Serial Interface

To prevent communication failures caused by consecutive 0s or 1s on a link, enable the payload scramble function on a serial interface.

Context

On a datacom network, the data link layer transmits distributed data frames to a specified interface at the physical layer. Upon receipt, the interface decapsulates these frames into data bits, encodes the bits based on the coding mode, and transmits them to a remote interface through high and low levels on a link. Upon receipt of the levels, the remote interface decodes them and restores them to data bits. In this way, the local device can communicate with the remote device.

If the payload of a data frame contains consecutive 0s, the link will stay at the zero level for a long time. After failing to detect signals for a prolonged period of time, the remoter interface mistakenly thinks that all bits have been received or the link is faulty, leading to a communication failure.

To resolve this problem, enable the payload scramble function on a synchronous serial interface or trunk-serial interface. Using this function, the interface adds interference to the payload to prevent consecutive 0s or 1s in the payload, avoiding communication failures.

Configurations of the payload scramble function on the local and remote interfaces must be consistent.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The view of the specified serial interface or trunk-serial interface is displayed.

  3. Run link-protocol atm

    ATM is configured as the link layer protocol.

  4. Run scramble

    The payload scramble function is enabled.

  5. Run commit

    The configuration is committed.

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Updated: 2019-01-02

Document ID: EDOC1100058399

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