Software release

• JUNOS 9.5 and later (Type 1)

Description

• Ten E1/T1 ports
• DS1 and E1 are selectable on a per-port granularity

• E1 channelization per PIC:
  • 10 E1 channels
  • 310 DS0 channels
• T1 channelization per PIC:
  • 10 T1 channels
  • 240 DS0 channels
• Power requirement: 0.52 A @ 48 V (24.73 W)

Hardware features

• Port numbering starts at 0

Software features

• 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.
• Support sending and receiving in-band loopback codes in both framed and unframed mode:
  • Framed in-band loopback at CSU
  • Framed in-band loopback at Smartjack (ANSI)
  • Unframed in-band loopback at CSU
  • Unframed in-band loopback at Smartjack (ANSI)
• You can configure the following framing modes using the CLI:
  • T1—SF (D4/superframe), ESF (extended superframe)
  • E1—G704, G704–no-crc4, unframed
• Packet buffering, Layer 2 parsing
• Local line, remote line, and remote payload loopback testing; each channel can be looped individually and independently of other channels
• Simple Network Management Protocol (SNMP): T1 MIB (RFC 1406)
• Dynamic, arbitrary channel configuration
• Full bit error rate test (BERT)
• Clocking: internal and loop (clock recovered from network and use for transmit). Internal timing is the default for channelized T1 ports. The external master clock can be a multiple of 2.048 MHz or 1.544 MHz for E1 or T1 operation.
• Line coding:
  • T1—CLI configurable as AMI or B8ZS
  • E1—HDB3

• 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
  • Point-to-Point Protocol (PPP)
  • PPP for CCC
  • PPP for TCC
• Encapsulations available only for DS0 and DS1:
  • Multilink Frame Relay end-to-end (MLFR FRF.15)
  • Multilink Frame Relay (MLFR) UNI NNI (MFR FRF.16)
  • Multilink PPP (MLPPP)

• Encapsulations available only for DS1:

  • PPP over Frame Relay

Cables and connectors

• 120–ohm RJ-48C connector (female)

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

• DS1 alarms:

  • Alarm indication signal (AIS)
  • Loss of frame (LOF)
  • Remote alarm indication signal (RAIS)
  • 24-hour alarm reporting history maintained for error statistics and failure counts, 15-minute intervals on all errors

• DS1 error detection:

  • Bursty errored seconds (BES)
  • CRC errors
  • Errored seconds (ES)
  • Line errored seconds (LES)
  • Loss of framing seconds (LOFS)
  • Loss of signal seconds (LOS)
  • Severely errored seconds (SES)
  • Severely errored framing seconds (SEFS)
  • Unavailable seconds (UAS)

Instrumentation (counters)

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