Technical Documentation

Channelized DS3 PIC (M40e Router)

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Software release

  • Junos OS Release 5.2 and later


  • Four DS3 ports
  • Power requirement: 0.32 A @ 48 V (15.6 W)
  • Supports up to 28 T1 channels per port
  • Data Service Unit (DSU) functionality

Hardware features

  • Each T1 channel supports a single High-Level Data Link Control (HDLC) framer that can be configured for speeds ranging from DS0 (64 Kbps) through full T1 (1.54 Mbps)
  • Predictable throughput on all ports at 1.54 Mbps, full duplex
  • Rate limiting on input and output
  • Packet buffering, Layer 2 parsing

Software features

  • DS3 alarm and event counting
  • DS3 alarm and event detection
  • DS3 diagnostics and loopback control
  • B3ZS line encoding
  • M13 or C-bit parity
  • DS3 Simple Network Management Protocol (SNMP) support (DS3 MIB)
  • Per-packet counts and byte counts
  • Local and remote loopback testing
  • Encapsulations:
    • High-Level Data Link Control (HDLC)
    • Frame Relay
    • Circuit cross-connect (CCC)
    • Translational cross-connect (TCC)
    • Point-to-Point Protocol (PPP)

Cables and connectors

  • Custom 10-ft (3.05-m) posilock to BNC male cable, separate RX and TX


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)
  • Bit error rate (BER)
  • Equipment failure (Does not affect service)
  • Excessive zeros (EXZ)
  • Far-end block error (FEBE)
  • Frame error
  • Idle code, Idle received
  • Line code violation (LCV)
  • 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

Published: 2010-08-14

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