User Manual - Configuration Guide (Volume 3)

Chapter 3

Versatile Routing Platform

E1 Voice Configuration

Chapter 3 E1 Voice Configuration

3.1 Overview of E1 Voice Configuration

3.1.1 Function of E1 Voice

E1 voice refers to the implementation of VoIP function over E1 line, so as to provide voice transmission mode compatible with data transmission. In order to implement this function, the corresponding E1 voice port needs to be provided on the router and also a range of functions suitable for voice transmission over E1 line should be provided. The networking that adopts E1 line for voice transmission is the same as the ordinary VoIP networking applications, except that the connection between PSTN switch and the router is through E1 trunk, and the signaling adopted for the line is R2 signaling (similar to China No. 1 Signaling) or DSS1 subscriber signaling on ISDN PRI interface. The basic networking is shown in the diagram below:

E1

Telephone

IP network

IP voice gateway

PSTN

Gate Keeper

IP voice gateway

PSTN

E1

Telephone

Figure VC-3-1Basic Structure of E1 Voice System

Adopting E1 voice mode, the router can provide more channels for voice communication and supports integrated transmission of data and voice, greatly enhancing the utilization rate of the router and the range of the services supported.

3.1.2 Usage of cE1/PRI Interface

The physical port of E1 voice is cE1/PRI interface, which is divided into 32 TSs (time slots) numbered from 0 to 31. The following lists three methods to use this interface:

I. Interface not divided into TSs logically

When used as E1 interface, do not divide it into TSs logically and use the full capability of the interface for data transmission. The bandwidth of the interface is 2Mbit/s (TSs 0 to 31) and its logical attribute is equal to the synchronous serial port with rate of 2Mbit/s. On the interface, link layer protocols such as PPP, FR, LAPB, X.25 and HDLC, and network protocols such as IP and IPX, are supported.

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Huawei v200r001 user manual Overview of E1 Voice Configuration, Function of E1 Voice, Usage of cE1/PRI Interface