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DS3/E3 Enhanced IQ (IQE) PIC (M7i Router)


Software release

  • Junos OS Release 10.2 and later


  • Four DS3 or E3 ports

  • DS3 or E3 is configurable on a per-port granularity

  • Power requirement: 0.51 A @ 48 V (24.7 W)

Hardware features

  • Ports are numbered 0 through 3 from left to right

Software features

  • Maximum transmission units (MTUs) of up to 9192 bytes

  • Subrate and scrambling:

    Note: Only DS3 interfaces support subrate and scrambling.

    • Digital Link/Quick Eagle

    • Kentrox

    • Larscom

    • ADTRAN

    • Verilink (subrate: only port A mode)

      Note: For DS3 interfaces, Verilink does not function if an IQE interface is paired with an IQ interface.

  • Data service unit (DSU) functionality

  • B3ZS line encoding

  • Framing: M13, C-bit parity, framed clear channel

  • Full bit error rate test (BERT)

  • ANSI T1.403 FDL

  • Internal and loop clocking

  • DS3 far end alarm and control (FEAC) channel

  • Local line, remote line, and remote playback loopback testing

  • Simple Network Management Protocol (SNMP): DS3 MIB

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

  • Enhanced fine-grained queuing per logical interface. See the Class of Service Feature Guide for Routing Devices and EX9200 Switches for more information about class of service features.

Cables and connectors

  • Standard DS3 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

  • DS3 alarms:

    • Alarm indication signal (AIS)

    • Loss of frame (LOF)

    • Loss of signal (LOS)

    • Phase lock loop (PLL)

    • Yellow alarm

  • DS3 error detection:

    • C-bit code violations (CCV)

    • C-bit errored seconds (CES)

    • C-bit severely errored framing seconds (CEFS)

    • CRC errors

    • Excessive zeros (EXZ)

    • Far-end block error (FEBE)

    • Far-end receive failure (FERF)

    • Line errored seconds (LES)

    • Parity bit (P-bit) code violations (PCV)

    • Parity bit (P-bit) errored seconds (PES)

    • Parity bit (P-bit) severely errored framing seconds (PSES)

    • Severely errored framing seconds (SEFS)

    • Unavailable seconds (UAS)

Instrumentation (counters)

  • Layer 2 per-queue and per-channel packet and byte counters