Software release

• Junos OS Release 9.3R2 and later (Type 1)

Description

• Four DS3 or E3 ports
• DS3 or E3 is configurable on a per-port granularity
• Power requirement: 0.51 A @ 48 V (24.7 W)

Hardware features

• Ports are numbered 0 through 3 top to bottom

Software features

• Maximum transmission units (MTUs) of up to 9192 bytes
• Subrate and scrambling:

  Note: Only DS3 interfaces support subrate and scrambling.

  • Digital Link/Quick Eagle
  • Kentrox
  • Larscom
  • ADTRAN
  • Verilink (subrate: only port A mode)

    Note: For DS3 interfaces, Verilink does not function if an IQE interface is paired with an IQ interface.

• Data service unit (DSU) functionality
• B3ZS line encoding
• Framing: M13, C-bit parity, framed clear channel
• Full bit error rate test (BERT)
• ANSI T1.403 FDL
• Internal and loop clocking
• DS3 far end alarm and control (FEAC) channel
• Local line, remote line, and remote playback loopback testing
• Simple Network Management Protocol (SNMP): DS3 MIB
• Quality of service (QoS) per channel: weighted round-robin (WRR), random early detection (RED), weighted random early detection (WRED)
• Enhanced fine-grained queuing per logical interface. See the Junos Class of Service Configuration Guide for more information about class of service features.

• Encapsulations:

  • Circuit cross-connect (CCC)
  • Translational cross-connect (TCC)
  • Extended Frame Relay for CCC and TCC
  • Flexible Frame Relay
  • Frame Relay
  • Frame Relay for CCC
  • Frame Relay for TCC
  • Frame Relay port CCC
  • High-Level Data Link Control (HDLC)
  • HDLC framing for CCC
  • HDLC framing for TCC
  • MPLS CCC
  • MPLS TCC
  • Multilink Frame Relay (MLFR) UNI NNI (MFR FRF.16)
  • Point-to-Point Protocol (PPP)
  • PPP for CCC
  • PPP for TCC

Cables and connectors

• Standard DS3 BNC coaxial cable interfaces

LEDs

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

• DS3 alarms:

  • Alarm indication signal (AIS)
  • Loss of frame (LOF)
  • Loss of signal (LOS)
  • Phase lock loop (PLL)

• DS3 error detection:

  • C-bit code violations (CCV)
  • C-bit errored seconds (CES)
  • C-bit severely errored framing seconds (CEFS)
  • 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)

Instrumentation (counters)

• Layer 2 per-queue and per-channel packet and byte counters