BSTU/QSTU - TDM & Ethernet leased lines over SDHSL.BIS

BSTU Family

Product Overview

The BSTU and QSTU product families enable network operators to transport Ethernet and TDM traffic over one or two copper wire-pairs. The termination units can be used in the access network or in any point-to-point application. The underlaying technology is SHDSL.bis and various interfaces for nx64 kbit/s, 2 Mbit/s or Fast Ethernet user traffic are available.

BSTU - SHDSL.bis Termination Units

The BSTU offers professional solutions for the delivery of business voice and data services with bandwidths up to 11,4 Mbit/s by using the SHDSL (Single pair Highspeed Digital Subscriber Line) technology according to ITU-T G.991.2. With its modular design and wide range of interfaces the BSTU is a very flexible solution, that can be used to meet specific customer requirements. The BSTU also includes a self learning Layer-2 switch with VLAN transparency.

QSTU - Quad- SHDSL.bis Termination Units

The QSTU is a SHDSL termination unit equipped with 4 SHDSL interfaces and (depending on the operating mode) up to 4 autonomous G.703 subscriber interfaces, enabling an ULAF+ subrack to host up to 64 2 Mbit/s lines.

  1. Highlight
  2. Features
  3. Data Sheets

  • Simultanous transport of E1 and V.35/V.36/X.21 data
  • Simultanous transport of E1 and Fast Ethernet traffic
  • Integrated Remote Power Supply (RPS) for remote feeding of repeaters or other termination units
  • Integrated clock transport for network synchronisation applications
  • Low power consumption
  • Configurable for one or two wire-pair operation


  • SHDSL.bis over 1, 2 (BSTU) or 4 (QSTU) wire pairs
  • up to 4 E1 systems per unit
  • up to 11.4Mbit/s Ethernet payload
  • add/drop: ‘Fractional E1’ and Eth or nx64kbit/s data into 2Mbit/s G.704
  • add/top: E1 and Eth or nx64kbit/s data over 1 or 2 wire pairs
  • 8 stage repeater support (BSRU/BSRU+)
  • optional integrated remote power supply
  • versatile clocking options
  • units are configurable as LT or NT

Supported Standards

  • ITU-T G.991.2 SHDSL
  • ITU-T G.994.1 Handshake
  • ETSI TS 101 524 SDSL
  • ITU-T G.703 Physical signal characteristics
  • ITU-T G.704 Structured E1
  • ITU-T  I.431 Primary rate ISDN
  • ITU-T V.35
  • ITU-T V.36
  • ITU-T X.21
  • IEEE 802.1D MAC Bridging
  • IEEE 802.3i 10BASE-T
  • IEEE 802.3u 100BASE-TX
  • IEEE 802.3x Flow Control
  • ITU-T G.823 Jitter and Wander
  • ITU-T G.826 Error Performance Parameters

Data Sheets


1 and 2 wire-pairs SHDSL.bis Termination Unit for TDM and Ethernet transport

[ File type: PDF | File size: ca. 375 KB ]


4 wire-pairs SHDSL.bis Termination Unit for 4x E1 transport

[ File type: PDF | File size: ca. 470 KB ]

© 2013 - 2015 Albis Technologies Ltd. All Rights Reserved