JUNOS 8.4 Network Interfaces Configuration Guide

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Configuring E1 Interfaces

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:

ITU-T Recommendation G.703, Physical/electrical characteristics of hierarchical digital interfaces, describes data rates and multiplexing schemes for the E series.
ITU-T Recommendation G.751, General Aspects of Digital Transmission Systems: Terminal Equipment, describes framing methods.
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).

To configure E1-specific physical interface properties, include the e1-options statement at the [edit interfaces interface-name] hierarchy level:




[edit interfaces interface-name]



e1-options {


bert-error-rate rate;


bert-period seconds;


fcs (16 | 32);


framing (g704 | g704-no-crc4
| unframed);


idle-cycle-flag (flags | ones) ; 


invert-data;


loopback (local | remote); 


start-end-flag (filler | shared);


timeslots time-slot-range;

}

This chapter contains the following sections:

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