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EIA-530 PIC (M7i Router)

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Software release

  • JUNOS 6.0 and later


  • Two EIA-530, X.21 or V.35 serial ports
  • Power requirement: 0.07 A @ 48 V (3.4 W)

Hardware features

  • Configured as data terminal equipment (DTE) ports
  • Resynchronization signal
  • Receives clock rates up to 16 Mbps
  • Local, data communications equipment (DCE) local, and DTE remote loopbacks

Software features

  • Supports four queues per port
  • Random early detection (RED)
  • Transmitter Signal Element Timing is looped from the timing received on the Transmitted Signal Element DCE. EIA-530 ports support the ability to invert the Transmit Data Element. The EIA-530 ports support the following rates:
    • 2.048 Mbps
    • 2.341 Mbps
    • 2.731 Mbps
    • 3.277 Mbps
    • 4.09 Mbps
    • 5.461 Mbps
    • 8.192 Mbps
    • 16.384 Mbps
  • V.35 ports support up to 2.048 Mbps
  • X.21 ports support up to 10 Mbps
  • 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

  • Two DB-25 male connectors (one per port, included with PIC)
  • V.35 requires an EIA-530 to V.35 cable and connects to a V.35 DTE 34-pin Winchester type male cable (one per port)
  • X.21 requires an EIA-530 to X.21 cable and connects to a X.21 DTE DB-15 male cable


Three bicolor per port:

  • Data set ready (DSR):
    • Green—DSR is detected or ignored
    • Red—DSR expected but not present
  • Data carrier detect (DCD):
    • Green—DCD is detected or ignored
    • Red—DCD expected but not present
  • Resynchronization:
    • Green—Keepalives are being received
    • Red—Data terminal ready (DTR) toggled from low to high (resynchronization pulses are being sent)

Instrumentation (counters)

  • Per-port packet and byte counters
  • Resynchronization counters:
    • Number of resynchronizations initiated
    • Time of last resynchronization

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