Adtran 1202086L1 ISU 512 ISDN Inverse Multiplexer

ISU 512 ISDN Inverse Multiplexer

The ADTRAN ISU 512 is a standalone ISDN Service Unit that connects data terminal equipment (DTE) to the ISDN network. The ISU 512 is specifically designed as a low-cost solution for applications such as video-conferencing, T1 backup, LAN/WAN connectivity, and high-speed file transfer. The ISU 512 is designed as a cost-effective inverse multiplexer for 384 kbps videoconferencing. Some video-conferencing products operate in a dual port mode. The ISU 512 is designed to operate in a dual port mode making it backward compatible with videoconferencing systems utilizing two Switched 56 DSUs or a dual port ISDN terminal adapter. The ISU 512 connects directly to the ISDN network using up to four Basic Rate ISDN (BRI) lines. By terminating four BRI circuits, the ISU 512 can create an aggregate bandwidth of up to 512 kbps which can be used to backup a T1 circuit. Since ISDN is a switched digital service, bandwidth can be established and utilized on an as needed basis.

Product Type: Data Demultiplexer
Number of Data Channels: 8
Maximum Data Transfer Rate: 512 Kbps
Height: 2.5"
Width: 7.9"
Depth: 10.5"
Weight (Approximate): 3.00 lb

This Adtran 1202086L1 ISU 512 ISDN Inverse Multiplexer is in refurbished condition and is fully guaranteed by our 90-day warranty. Please feel free to contact us regarding our inventory of refurbished Adtran networking equipment, or if you have any additional questions regarding this 1202086L1 ISU 512 ISDN Inverse Multiplexer.

United States of America Shipping


Orders for this Adtran 1202086L1 unit which qualify for Free Super-Saver Shipping are shipped at our discretion via the lowest cost method. We use FedEx, UPS, and US Postal Service as shipping carriers. We cannot ship this Adtran 1202086L1 within the USA by billing directly to your shipper account number. All shipping charges must be pre-paid at checkout.


International / Foreign Shipping


Adtran 1202086L1 ISU 512 ISDN Inverse Multiplexer units which are shipped internationally have a mandatory 4-10 business day security holding period between payment being received and shipment processing. This security policy is to allow funds to fully clear our bank account. International transport costs can be charged directly to your FedEx or UPS account number. We cannot ship internationally using your TNT account number; however you can coordinate with TNT to have them pick up the shipment from our location.


Expedited and Rush Shipping can usually provide expedited (1 or 2 day shipping) for Adtran products; however there is an additional rush fee per unique Adtran 1202086L1 ISU 512 ISDN Inverse Multiplexer unit in addition to the product cost and expedited carrier shipping charges. If we can offer expedited shipping for an item, expedited shipping costs will be shown at checkout. If we cannot provide expedited shipping for an item, then you will not be presented with these options during the cart checkout process.

  • Manufacturer: Adtran
  • Part Number: 1202086L1
  • Units in Stock: 5
  • Condition: Refurbished
  • Warranty: 90 Days
  • Description: Adtran 1202086L1 ISU 512 ISDN Inverse Multiplexer

  • Ships next business day.
    Expedited shipping not available.
  • Price: $101.95