DataBand ISU 1024 - I-Mux Service Unit. Up to 1.024Mbps with an ISDN PRI plus up to 4 x BRI ISDN ports


DataBand ISU 1024

The DataBand ISU and CSI range connect high speed serial data devices together using multiple ISDN calls, in effect dialling a high-speed “leased line” between non-ISDN devices. The 1024 version is available with one PRI ISDN plus up to 4 Basic Rate ISDN interfaces and can deliver data rates of up to 1.024Mbps per serial port. Specifying a unit with 1 PRI (user switchable between E1 and T1) plus a mixture of 2-wire “U” BRIs and 4-wire “S” interfaces means users in the field can utilise whatever service is available to them. The “S” BRI interfaces can optionally be individually switched between the standard TE presentation (connects to a carrier-delivered service) and NT presentation (acts like a carrier interface and connects to other  ISDN equipment). This feature gives added flexibility on service types and means other ISDN devices can also share the network resources. Available with 1 or 2 I-Mux serial ports. The ISDN can be partitioned between the 2 ports or access dynamically so 1 port can use all of the ISDN, for example. This gives a great deal of flexibility on potential speeds of different calls.

The ISU 1024 supports a single interface to a DTE plus an RS366 dialling port, or one or two DTE interfaces (using a dialling method other than RS366). All units use high-quality internal PSUs and are available with AC or DC inputs. Ability for I-Mux ports to provide clock or not. This overcomes issues with some attached devices. The key-pad and LCD are designed for fast and simple operation of the device with minimal input required to perform the dialling functions. Detailed configuration is achieved via the GUI, which can be connected via the serial port (can be disabled), an Ethernet port (used only for configuration access and can be disabled) or via a remote ISDN call (can be disabled). Various Password levels are available if required. The GUI (DbLite) is free of charge and provides configuration of one unit at a time. The traffic between the Manager GUI and the device can be optionally encrypted via an AES256bit system with key exchange routines. Unlike most other devices, the DataBand has formal Telecommunications Approvals for direct connection to carrier ISDN services.


  • ISDN inverse multiplexer or I-Mux
  • Single PRI interface to the network
  • Optional BRI ports
  • BRI ports as 2-wire “U” and/or 4-wire “S”
  • Single or dual high speed serial ports
  • V.35, RS530, X.21 interfaces
  • RS366, control lead, front panel or GUI dialling
  • If 2 ports are fitted each can share/contend or all/part of the ISDN
  • Speeds to 1.024Mbps
  • Supports BONDing standard and 64K ‘clear’
  • Option to clock or not clock idle ports
  • Inter-works with other I-Muxes, including Adtran® ISU
  • Interworks with DataBand CSI (Central Site IMux)
  • Intuitive GUI and front panel control
  • Local Management serial port and Ethernet port (can be disabled)
  • Password protected
  • Encrypted Management protocol
  • NV RAM stores configuration
  • Dual FLASH banks for updates
  • New design using latest supportable components
  • Extensive Approvals including Telecoms
  • Low power consumption
  • RoHS compliant

Typical Applications:

  • Video conferencing
  • Inter-connectivity of encryptors
  • High speed file transfer
  • Aggregation of several satellite links
  • Leased line backup

Application Examples:

1. Standalone Use - The I-Mux capability, using industry standard BONDing algorithms, aggregates the separately dialled and routed ISDN channels, re-ordering them and handling the differential delays between all of the ISDN calls.

DataBand ISU 1024 diagram 1

2. Inter-Connection of Encryptors - ISDN on-demand access for V.35, RS530 and V.21 encryptors Stand-alone DataBand ISU to stand-alone ISU.

DataBand ISU 1024 diagram 2

And/or stand-alone to CSI Central Site I-Mux.

DataBand ISU 1024 diagram 3

3. Video-conferencing (VC) - ISDN access for non-ISDN video-conference units. Inter-operates with VCs with internal ISDN ports and BONDing aggregation. Dual-port version gives access to two attached devices, each sharing the ISDN at the same time, or using all the ISDN for one device.

DataBand ISU 1024 diagram 4

4. Share ISDN access - Use ISDN services between data devices using the I-Mux capability and other ISDN equipment. This example shows a PRI to the network and 4 BRI NT ports to local devices, such as STE encrypted telephones, PCs, routers etc. The VC can run at up to 1.024Mbps and the BRIs have access to both “B” channels. For other ISDN switch, conversion and sharing capabilities see our Liberator range.

DataBand ISU 1024 diagram 5

5. High Speed File Transfer - Dial up high speed access when needed.

DataBand ISU 1024 diagram 6

6. Leased Line Backup or Disaster Recovery - Dial backup capacity when needed, via an independent network.

DataBand ISU 1024 diagram 7


A single chassis supports two Interface cards. Two chassis can be inter-linked via the fibre Cascade capability to isolate data ports from ISDN ports.

A. Network Interfaces

  • 1 PRI RJ45 ISDN interface E1/T1
  • Optionally 4 BRI interfaces, RJ45. Available as “S” or “U”.

B. DTE Interfaces - Up to two factory-fit cards available. Any combination:

  • V.35 “MRAC”
  • RS530 25-way “D” – Adtran compatible
  • X.21/V.11 15-way “D”
  • RS366 dialling port 25-way “D” - Adtran compatible
  • Speeds to 512kbps each interface
  • Optionally speeds up to 1.024Mbps each interface

C. LCD/Front Panel

  • 2 x 16 character LCD
  • 16 button key-pad

D. Out-going Dialling Options

  • GUI
  • Control lead - pre-stored
  • RS366
  • Front key-pad/LCD
    • Password protected
    • Pre-stored numbers
    • Manual entry of number(s)

E. In-coming Call Options

  • Accept all
  • Accept authorised (CLI)
  • Manual accept
  • Reject all

F. Data rates: 64kbps to 1024kbps per data port (BONDing). 64kbps 'clear'
G. Inter-operability: BONDing compatible devices, including inverse multiplexers
H. ISDN switch compatibility: National 1 (USA), 5ESS, DMS100, Euro-ISDN
I. Power:


  • Internal switch mode supply
  • Standard IEC connector
  • 96-240VAC auto-sensing
  • Max current consumption 100mA @230VAC


  • Internal supply
  • Standard 4mm Terminal Block
  • -33 to -75 VDC
  • 0.35A max consumption

J. Non-Volatile Memory: Configuration held in non-volatile FLASH memory

K. Physical

  • 292w x 200d x 44h
  • Metal chassis, front & rear panels
  • 1.4Kg/2.4lb
  • Optional 19" Rack Mount Kit

L. Environment

  • Operating 0º to 55ºC
  • Natural convection cooling
  • Humidity 10-90% non-condensing

M. Maintenance: There are no serviceable parts or maintenance required.
N. Approvals

  • CE marked
  • IEC60950-1:2nd Edition
  • ACS/NZS60950:1:2011 (IEC60950 and ETSI telecoms safety standards. Suitability to the latest interim ACMA telecoms safety requirement cannot be guaranteed - external primary surge protection may be required. Check specific local carrier compliance requirements.)


  • FCC Part 15 Class A
  • EN55022:2006 - A1:2007
  • EN55024:1998-A2:2003
  • EN61000-3-2:2006
  • AS/NZS CISPR32:2001


  • TBR3/TBR4
  • AS-ACIF-S031 and S038
  • CS-03 Canada
  • TIA-968-A USA


  • Compliant

Live Demo of FRM220 Chassis

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