Adtran Total Access 1500 Quad Line Interface Unit (LIU)
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Product Information for Adtran Total Access 1500 Quad Line Interface Unit (LIU)

Highlights for Adtran Total Access 1500 Quad Line Interface Unit (LIU)

Marketing Information

This Adtran Total Access 1500 Quad LIU is a common module for the ADTRAN standard Total Access 1500 chassis (P/N 1180001L1) or the Total Access 1500 19-inch chassis (P/N 1180019L1). It connects the chassis to a T1 line at the DSX-1 or DS1 level. All data formatting and line encoding as well as backplane timing and control are performed by this Quad LIU. The Quad LIU incorporates SLC Mode II operation, fast failover to the optional redundant offline LIU, and works in conjunction with the SCU to provide for Voice Frequency (VF) Test Access.

General Information

  • Manufacturer: Adtran
  • Manufacturer Part Number: 1180109L2
  • Product Line: Total Access
  • Product Name: Total Access 1500 Quad Line Interface Unit (LIU)
  • Manufacturer Website Address:
  • Product Series: 1500
  • Product Type: Expansion Module
  • Brand Name: Adtran

Media & Performance

Management & Protocols


Additional Information


  • Terminates up to 4 T1 lines providing DSX-1 or DS1 interface to the network
  • Terminates 1 T1 Protect Line for LIU protection
  • Supports up to 96 DS0s
  • SF, ESF, or SLC-96 data framing formats
  • AMI or B8ZS line code formats
  • Local and remote loopbacks
  • Front panel bantam jacks for monitoring T1s
  • Local, loop, or external timing modes
  • Supports ANSI T1.403 in-band payload and line loopback
  • Supports SLC Mode I, II, and III

    Package Contents

  • Total Access 1500 Quad Line Interface Unit (LIU)
  • Quad Line Interface Unit (LIU) Installation and Maintenance Practice


    ADTRAN Total Access 1500 chassis

    Power Description

    Environmental Conditions

    Physical Characteristics

  • Dimensions: 3.12" Height x 1.14" Width x 10.1" Depth
  • Weight: 1 lb


  • Standard Warranty: 10 Year


  • Interfaces/Ports: Not Applicable
  • Interfaces/Ports Details: Not Applicable

I/O Expansions

Processor & Chipset