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E1 PIC (M7i Router)

Image g001372.gif

Software release

  • JUNOS 6.0 and later


  • Four E1 or coaxial ports
    • 4-port, 120-ohm, RJ-48
    • 4-port, 75-ohm, coaxial
  • Power requirement: 0.08 A @ 48 V (3.74 W)
  • Onboard DSU functionality for E1 connectivity

Hardware features

  • High-performance throughput on each port at speeds up to 2.048 Mbps, full duplex
  • Maximum transmission units (MTUs) of up to 4500 bytes
  • Per-interface diagnostics and loopback control
  • Per-interface shaping on output
  • Per-interface alarm and event counting and detection
  • HDB3 line coding
  • 4-bit CRC for G.704 framed mode
  • Per-port loop timing
  • Balanced and unbalanced modes
  • Packet buffering, Layer 2 parsing
  • Full bit error rate test (BERT)

Software features

  • Integrated support for G.703 unframed mode and G.704 framed mode with CRC; this feature is user-configurable

    Note: The G.704 implementation supports speeds slower than 2.048 Mbps; multiple channels within a single E1 interface are not supported.

  • Configurable clock source: Internal or loop
  • Encapsulations:
    • High-Level Data Link Control (HDLC)
    • Frame Relay
    • Circuit cross-connect (CCC)
    • Point-to-Point Protocol (PPP)

Cables and connectors

  • Two versions:
    • Four RJ-48 connectors (one per port)
    • Four coaxial connectors
  • Custom 10-ft (3.05-m) posilock to BNC male cable, separate Rx and Tx


One tricolor per port:

Alarms, errors, and events

  • Alarm indication signal (AIS)
  • Bipolar violations
  • Excessive zeros
  • Far-end block errors (FEBE, E-bit errors)
  • Loss of frame (LOF), Loss of signal (LOS)
  • Local and remote loopback diagnostics
  • Yellow alarm bit (X-bit) disagreements

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