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:

• Configuring E1 BERT Properties
• Configuring the E1 Frame Checksum
• Configuring E1 Framing
• Configuring the E1 Idle Cycle Flag
• Configuring E1 Data Inversion
• Configuring E1 Loopback Capability
• Configuring E1 Start and End Flags
• Configuring Fractional E1 Time Slots
• Configuring the Media MTU
• Configuring the Encapsulation on a Physical Interface
• Configuring the Clock Source
• Configuring Receive and Transmit Leaky Bucket Properties
• Configuring an ISDN Dialer Interface as a Backup Interface