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Figure 1: DS3/E3 MICDS3/E3 MIC

Software release

  • Junos OS Release 11.4 and later

For information on which MPCs support this MIC, see MIC/MPC Compatibility. For information on which MICs are supported on MX Series routers, see MICs Supported by MX Series Routers.


  • Eight E3 or DS3 ports

  • DS3/E3 MIC ports can be configured as one of the following:

    • 8 clear-channel DS3 ports

    • 8 channelized DS3 ports

    • 8 clear-channel E3 ports


    You can upgrade the DS3/E3 MIC with the S-MIC-3D-8CHDS3 software license (purchased separately) to support DS3 channelization. Channelized DS3/E3 MIC is supported only on queuing MPCs. On the MX80 router, you also need an S-MX80-Q software license.

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

  • DS3 channelization for the 8-port Channelized DS3/E3 MIC:

    • 8 DS3 channels

    • 224 DS1 channels

    • 2038 DS0 channels

  • Power requirement: 4.0 A @ 9 V (36W)

  • Weight: 4.4 lb (2 kg)

  • Model numbers:

    • DS3/E3 MIC: MIC-3D-8DS3-E3

    • Channelized DS3/E3 MIC: MIC-3D-8CHDS3-E3-B

Hardware features

  • Ports are numbered 0 through 7, Tx0 through Tx7 and Rx0 through Rx7

Software features

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

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

  • Subrate and scrambling:


    Only DS3 interfaces support subrate and scrambling.

    • Digital Link/Quick Eagle

    • Kentrox

    • Larscom

    • ADTRAN

    • Verilink

  • Internal and look clocking

  • DS3 far-end alarm and control (FEAC) channel

  • Full bit error rate test (BERT) for DS0, DS1, and DS3

  • Encapsulations:

    • MPLS fast reroute

    • MPLS CCC (circuit cross-connection)

    • MPLS TCC (translational cross-connection)

    • Cisco High-Level Data Link Control (cHDLC)

    • Cisco HDLC CCC

    • Cisco HDLC TCC

    • Point-to-Point Protocol (PPP)

    • PPP for CCC

    • PPP for TCC

    • Flexible Frame Relay

    • Frame Relay

    • Frame Relay for CCC

    • Frame Relay for TCC

    • PPP over Frame Relay


    Ethernet over Frame Relay is not supported.

  • Encapsulations available only for Channelized DS3/E3 MIC (Junos OS Release 12.1 and later):

    • Multilink Point-to-Point Protocol (MLPPP)

    • Multiclass MLPPP

    • Multilink Frame Relay (MLFR) end-to-end (FRF.15)

    • Multilink Frame Relay (MLFR) UNI NNI (FRF.16, also referred to as MFR)

    • Compressed Real-Time Transport Protocol (CRTP)


    When you configure multilink services on a MIC in an MX Series router, ensure that a Multiservices DPC is present in the same router.

Cables and connectors


You can use the Hardware Compatibility Tool to find information about the pluggable transceivers supported on your Juniper Networks device.

The list of supported transceivers for the MX Series is located at;=All&pf;=MX+Series.

  • Coaxial:

    Custom 10-ft (3-m) mini-SMB to BNC cable (model number: CBL-DS3-E3-M-S), set of 8 cables (bundled RX and TX)


OK/FAIL LED, one bicolor:

  • Green—MIC is functioning normally

  • Red—MIC has failed

Link LED, one green 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 seconds (LOS)

  • Phase lock loop (PLL)

DS3 error detection:

  • C-bit code violations (CCV)

  • C-bit errored seconds (CES)

  • C-bit severely errored seconds (CSES)

  • 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)