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E3 IQ PIC (M120 Router)


Software release

Note: This PIC is not supported in Junos OS Release 8.1R1.


  • Four E3 ports

  • Power requirement: 0.38 A @ 48 V (18 W)

  • Fine-grained queuing per logical interface

Hardware features

  • Clear-channel (34.368-Mbps) and subrate E3

  • Unframed or ITU G.751 framing

  • Data service unit (DSU) functionality

  • Subrate and scrambling:

    • Digital Link/Quick Eagle

    • Kentrox

  • HDB3 line encoding

  • Full bit error rate test (BERT)

  • Local and remote loopback testing

Software features

  • Quality of service (QoS) per port: weighted round-robin (WRR), random early detection (RED), weighted random early detection (WRED)

  • Simple Network Management Protocol (SNMP): E3 MIB, QoS MIB

  • Input policing and output shaping

  • Provider-side rate limiting

  • Full data link connection identifier (DLCI) range with sparse channel numbering

  • Per-DLCI queues with weighted deficit round-robin and strict priority

  • Encapsulations:

    • High-Level Data Link Control (HDLC)

    • Frame Relay

    • Circuit cross-connect (CCC)

    • Translational cross-connect (TCC)

    • Point-to-Point Protocol (PPP)

  • Junos OS Release 7.0 or later is required to configure graceful Routing Engine switchover (GRES).

Cables and connectors

  • Standard E3 BNC coaxial cable interfaces


One tricolor per port:

  • Off—Not enabled

  • Green—Online with no alarms or failures

  • Yellow—Online with alarms for remote failures

  • Red—Active with a local alarm; router has detected a failure

Alarms, errors, and events

  • Alarm indication signal (AIS)

  • Equipment failure (does not affect service)

  • Frame error

  • Line code violation

  • Loss of signal (LOS)

  • Out of frame (OOF)

  • Yellow alarm bit (A-bit) disagreements

Instrumentation (counters)

  • Layer 2 per-queue packet and byte counters