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Interoperation Configuration Guide

AR Router

This document provides cases for connecting AR enterprise routers to devices of other vendors.

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Overview

Overview

Concepts

The E1 system is recommended by the International Telecommunications Union Telecommunication Standardization Sector (ITU-T). An E1 interface, working at a rate of 2.048 Mbit/s, complies with the G.703 and G.704 standards. The E1 system is mainly used in Europe and China. A CE1/PRI interface is a physical interface in the E1 system, which can transmit voice, data, and video service packets. A CE1/PRI interface can work in E1 mode (unchannelized mode) or CE1/PRI mode (channelized mode).

  • In E1 mode, a CE1/PRI interface works at a rate of 2.048 Mbit/s without timeslot division. Similar to a synchronous serial interface, a CE1/PRI interface supports link layer protocols, such as the Point-to-Point Protocol (PPP) and Frame Relay (FR), and the Internet Protocol (IP).
  • The CE1/PRI interface working in CE1/PRI mode functions as either a CE1 or PRI interface. In CE1/PRI mode, the 2 Mbit/s transmission line of the CE1/PRI interface is divided into 32 timeslots at a rate of 64 kbit/s. The 32 timeslots are numbered 0 through 31, and timeslot 0 transmits synchronization signals.

E1 Interface Card

All the timeslots, except timeslot 0, on E1 interfaces of an E1 interface card are randomly bundled into multiple channel sets. Each channel set corresponds to a channel. The AR supports E1 interface cards and configuration of CE1/PRI interfaces.

Table 15-1 lists the five types of E1 interface cards supported by the AR. Users can choose appropriate E1 interface cards based on the number of interfaces that are required and the connectors that are used.

Table 15-1  E1 interface cards supported by the AR

Interface Card

Number of Interfaces Supported

Connector Type

Slot Type

Working Mode

1E1/T1-M

1

D89

SIC slot

e1-data/t1-data

2E1/T1-M

2

D89

SIC slot

e1-data/t1-data

2E1/T1-M-W

2

D89

WSIC or XSIC slot

e1-data/t1-data

4E1/T1-M

4

RJ45

e1-data

8E1/T1-M

8

RJ45

e1-data

E1 Cable

Users can select E1 cables based on the type of E1 interface cards and the type of connectors connected to E1 interfaces. Table 15-2 lists the E1 cables supported by the AR.

Table 15-2  E1 cables supported by the AR

Cable

Interface Card

Working Mode of the Interface Card

75-ohm DB9-to-BNC cable

1E1/T1-M

2E1/T1-M

2E1/T1-M-W

e1-data

75-ohm RJ45-to-BNC cable

4E1/T1-M

8E1/T1-M

e1-data

120-ohm DB9-to-RJ45 cable

1E1/T1-M

2E1/T1-M

2E1/T1-M-W

e1-data

120-ohm RJ45-to-RJ45 cable

4E1/T1-M

8E1/T1-M

e1-data

100-ohm DB9-to-RJ45 cable

1E1/T1-M

2E1/T1-M

2E1/T1-M-W

t1-data

Application Scenario

To connect to a transmission network through a 2 Mbit/s E1 leased line, configure a CE1/PRI interface to work in E1 mode. As shown in Figure 15-1, the headquarters and branch of an enterprise are connected through the transmission network of a carrier. The enterprise leases a 2 Mbit/s E1 line from the carrier.

Figure 15-1  Connecting to a transmission network through an E1 leased line
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Updated: 2019-05-17

Document ID: EDOC1100034005

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