Juniper Networks® Field Guide and Reference

Configuring E1 and E3 Interfaces

E1 is a standard WAN digital communication format designed to operate over copper facilities at a rate of 2.048 Mbps. E3 is a high-speed WAN digital communication technique designed to operate over copper facilities at a rate of 34.368 Mbps. Both are widely used outside North America. E1 is a basic time division multiplexing scheme used to carry digital circuits, and E3 is the time division multiplexing scheme used to carry 16 E1 circuits.

To configure E1-specific physical interface properties, include the e1-options statement:

[edit interfaces interface-name] 
e1-options {
  bert-error-rate rate;
  bert-period seconds; fcs (32 | 16); framing (g704 | g704-no-crc4 | unframed); idle-cycle-flag (flags | ones); loopback ...