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DS3 PIC (M320 Router)

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Software release

  • JUNOS 6.2 and later (Type 1)


  • Four DS3 ports
  • Power requirement: 0.47 A @ 48 V (22.5 W)
  • Integrated DSU interoperability with leading DSU vendors

Hardware features

  • High-performance throughput on each port at speeds up to 44.736 Mbps, full duplex
  • C-bit framing
  • B3ZS line encoding
  • Subrate and scrambling:
    • Digital Link
    • Kentrox
    • Larscom
  • Per-port rate policing on input
  • Per-port rate shaping on output
  • Packet buffering, Layer 2 parsing

Software features

  • DS3 functionality:
    • C-bit framing
    • B3ZS line encoding
  • DS3 diagnostics and loopback control
  • DS3 alarm and event counting and detection
  • Per-packet counts and byte counts
  • Local and remote loopback testing, as well as BERT testing per DS3
  • DS3 far-end alarm and control (FEAC) channel support
  • Encapsulations:
    • High-Level Data Link Control (HDLC)
    • Frame Relay
    • Circuit cross-connect (CCC)
    • Point-to-Point Protocol (PPP)

Cables and connectors

  • Custom 10-ft (3.05-m) posilock SMB to BNC male cable, separate Rx and Tx (provided)


One tricolor per port:

  • Off—Not enabled
  • Green—Online with no alarms or failures
  • Amber—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)
  • Bit error rate test (BERT) functionality on PIC (you can configure one DS3 channel in BERT mode and configure the remaining channels to transmit and receive normal traffic)
  • Equipment failure (does not affect service)
  • Far-end block error (FEBE)
  • Frame error
  • Idle code, Idle received
  • Local and remote loopback
  • Loss of signal (LOS)
  • Out of frame (OOF)
  • Parity bit (P-bit) disagreements
  • Path parity error
  • Yellow alarm bit (X-bit) disagreements

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