ADTRAN INC | 1202029L2
ISU 128 terminates ISDN BRI U-interface and provides V.35 and EIA-530/232 DTE serial interfaces

MFR PART #  1202029L2
PART #  187679
Minimum 1 Each


The ISU Series products are ideal for terminating basic rate service from PBXs and central offices. The ISDN terminal adapters are designed for solutions requiring speeds of 128 kbps. Some models have built-in NT1 functionality. ADTRAN ISDN inverse mul tiplexers provide additional functionality at rates up to 512 kbps.

This part is discontinued by supplier with no suggested replacement.


Expansion Modules/Slots 0
Number of Wan Ports 1-2
Primary WAN Connectivity ISDN BRI
Type of Device ISDN ACCESS
UNSPSC Code 55101515

Spec Sheet

Spec Sheet

Shipping and Fulfillment Policy

When you order products from, the order is processed within one to two business days. Orders received during non-business days are processed on the next business day.

You have several shipping options for parcel shipping: standard ground 5 to 7 business days, 2 to 3 business days, or next business day. orders ship to addresses within the United States. orders do not currently ship to addresses outside the United States or military/government APO/FPO locations. We are also not able to ship to Post Office Box addresses. If you wish to ship to an address outside the United States or a military/government location, please contact your local Anixter sales representative to discuss your options.

In addition, offers Less-Than-A-Truckload “LTL” option for products that cannot be shipped via parcel shipping. For products that will be shipped via LTL, you will be provided with a set of Accessorials to select from to provide Anixter with additional shipping considerations, such as residential delivery, inside delivery, liftgate or limited access.

  • Residential Delivery - A residential delivery charge applies to shipments to a home or private residence, including locations where a business is operated from a home, or to any shipment in which the shipper has designated the delivery address as a residence.
  • Inside Delivery - When requested, freight carrier unloads shipments from or to areas that are not next to the trailer, such as shopping malls or office buildings. An elevator must be available to provide service to floors above or below the trailer.
  • Liftgate - Freight carrier provides liftgate service, if needed, to load and unload a shipment when loading/unloading docks are not available.
  • Limited Access Locations - A limited access location is a site where pickup or delivery is restricted or limited.

Shipping charges are calculated based on the shipping option you select, and is prepaid by you at the time of shipment.