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CHAPTER 1

E1 Interfaces

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E1 Interfaces Overview on page 3

E1 Interfaces Overview

E1 is a standard WAN digital communication format designed to operate over copper

facilities at a rate of 2.048 Mbps. Widely used outside North America, it is a basic

time-division multiplexing scheme used to carry digital circuits. The following standards

apply to E1 interfaces:

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ITU-T Recommendation G.703, Physical/electrical characteristics of hierarchical digital

interfaces, describes data rates and multiplexing schemes for the E Series.

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ITU-T Recommendation G.751, General Aspects of Digital Transmission Systems: Terminal

Equipment, describes framing methods.

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ITU-T Recommendation G.775, Loss of Signal (LOS) and Alarm Indication Signal (AIS)

Defect Detection and Clearance Criteria, describes alarm reporting methods.

NOTE: The Juniper Networks E1 Physical Interface Card (PIC) does not

support Channel Associated Signaling (CAS).

Documentation

• Physical Interfaces

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