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Channelized T1 IQ PIC (M320 Router)

Image g002310.gif

Software release

  • JUNOS 7.4 and later (Type 1)


  • Ten T1 ports
  • Power requirement: 0.15 A @ 48 V (7.2 W)
  • Fine-grained queuing per logical interface
  • Channelization: T1, FT1, NxDS0

Hardware features

  • Data service unit (DSU) and channel service unit (CSU) functionality
  • Ports configurable as clear channel T1 interfaces with 1.544-Mbps connectivity
  • Framing: Superframe (SF or D4) and Extended Superframe (ESF)
  • Supports B8ZS (bipolar 8-zero substitution) and AMI (alternate mark inversion) line coding
  • Local, remote, and payload loopback testing
  • ANSI T1.403 loopback support:
    • Responds to embedded loopback commands upon receipt of an FDL command from remote end with loopup and loopdown at both line and payload level
    • Insertion of loopback commands enables remote CSU/NIU/Smartjack to enter loopback and loopdown at both the line and payload level (ANSI and Telcordia)
  • Inband loopback support:
    • Responds to inband loopback commands at both the line and payload level (ANSI and Telcordia)
    • Insertion of inband loopback commands at both the line and payload level (ANSI and Telcordia)
  • Clocking support of external (line) and internal
  • Buildout support of the following ranges:
    • 0 through 132 (Line buildout is from 1 through 132 feet)
    • 133 through 265 (Line buildout is from 133 through 265 feet)
    • 266 through 398 (Line buildout is from 266 through 398 feet)
    • 399 through 531 (Line buildout is from 399 through 531 feet)
    • 532 through 655 (Line buildout is from 532 through 655 feet)

Software features

  • Quality of service (QoS) per channel: weighted round-robin (WRR), random early detection (RED), weighted random early detection (WRED)
  • SNMP: T1 MIB and DS0 MIB
  • Dynamic, arbitrary channel configuration
  • Full bit error rate test (BERT) patterns at T1 and DS0 levels
  • 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

  • 120-ohm RJ-48C connector (female)


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)
  • Bipolar violation (BPV)
  • Excessive zero (EXZ)
  • Line code violation (LCV)
  • Loss of frame (LOF)
  • Loss of signal (LOS)
  • Remote defect indication (RDI)

Error detection:

  • Error seconds (ES)
  • Severely errored seconds (SES)
  • Severely errored frames (SEF)
  • Bit error event (BEE)

Instrumentation (counters)

  • Layer 2 per-queue and per-channel packet and byte counters
  • 24–hour history or error counter updated at 15–minute intervals

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