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Chapter 29
Configuring E1 Interfaces
E1 Interfaces Overview
Configuring E1 Physical Interface Properties
E1 Interfaces Overview on page 561
Configuring E1 Physical Interface Properties on page 561
Configuring E1 BERT Properties on page 562
Configuring the E1 Frame Checksum on page 563
Configuring E1 Framing on page 563
Configuring the E1 Idle Cycle Flag on page 564
Configuring E1 Data Inversion on page 564
Configuring E1 Loopback Capability on page 564
Configuring E1 Start and End Flags on page 566
Configuring Fractional E1 Time Slots on page 566
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:
E1 Interfaces Overview
561
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