JUNOS 8.4 Network Interfaces Configuration Guide

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Configuring E3 Interfaces

E3 is a high-speed WAN digital communication technique designed to operate over copper facilities at a rate of 34.368 Mbps. Widely used outside North America, it is the time-division multiplexing scheme used to carry 16 E1 circuits. The following standards apply to E3 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.

The JUNOS software supports the E3 Physical Interface Card (PIC) and the E3 Intelligent Queuing (IQ) PIC. The E3 IQ PIC supports transmission scheduling on logical interfaces. For more information, see the JUNOS Class of Service Configuration Guide.

Note: In unframed mode, the E3 IQ PIC does not detect yellow or loss-of-frame alarms.

To configure E3-specific physical interface properties, include the e3-options statement at the [edit interfaces interface-name] hierarchy level:




[edit interfaces interface-name]



e3-options {


bert-algorithm algorithm; 


bert-error-rate rate; 


bert-period seconds; 


compatibility-mode (digital-link | kentrox
| larscom) <subrate value>; 


fcs (16 | 32);


idle-cycle-flag value; 


loopback (local | remote); 

(payload-scrambler | no-payload-scrambler); 


start-end-flag value; 

(unframed | no-unframed);

}

This chapter contains the following sections:

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