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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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Overview of Serial Interfaces

Overview of Serial Interfaces

Serial interfaces include both synchronous and asynchronous serial interfaces.

Compared with asynchronous serial interfaces, synchronous serial interfaces are more commonly used. Unless otherwise specified in this document, serial interfaces refer to synchronous serial interfaces.

The serial interfaces formed by channelized E-carrier or channelized packet over SONET/SDH (CPOS) interfaces have the same logical features as synchronous serial interfaces and are commonly used serial interfaces. Here, SONET stands for synchronous optical network, and SDH stands for synchronous digital hierarchy.

Serial interfaces support multiple types of cables and Point-to-Point Protocol (PPP) and time division multiplexing (TDM). Serial interfaces can work on either data terminal equipment (DTE) or data circuit-terminating equipment (DCE).

Serial Interfaces Types

The NE40E supports synchronous serial interfaces of E1 and CPOS. The naming conventions of these serial interfaces are different.

Synchronous serial interfaces channelized by physical interfaces support configurations of link protocols and MTU. Table 2-1 shows the naming conventions.

Table 2-1 Naming conventions for serial interfaces

Physical Interface

Naming Convention


serial controller-number:set-number or serial controller-number:0


serial cpos-number/e1-number:set-number or serial cpos-number/e1-number:0

Serial Interface Features

The serial interfaces supported by the NE40E have the following characteristics:
  • Work on a DTE or DCE:
    • A DTE is a user device. Only a user-to-network interface (UNI) on a DTE can be a serial interface.
    • A DCE is a network device that provides access for user devices. Only a network-to-network interface (NNI) on a DCE can be a serial interface.
    • Generally, a DTE uses a serial interface to receive clock information from a DCE.
  • Support multiple types of cables, such as V.24 and V.35. The NE40E automatically detects the types of cables connected to serial interfaces and selects the electrical features of these serial interfaces. Generally, this process does not require manual intervention.
  • Use the PPP, TDM, , HDLCor ATM as the link-layer protocol.
  • Support network-layer protocols, such as IP.
Updated: 2019-01-02

Document ID: EDOC1100058399

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