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61202.029L2-1 ISU 128 User Manual 11
Chapter 3
Installation
After unpacking the unit, immediately inspect it for possible shipping dam-
age. If damage is discovered, file a claim immediately with the shipping car-
rier, then contact ADTRAN Repair and Return Department (see the end of this
manual).
Ensure that a grounded, 115 VAC, 60 Hz receptacle is used to provide power.
NETWORK CONNECTION
The ISU 128 supports either dial or leased operation. An eight-pin RJ-45 mod-
ular jack labelled ISDN IFC on the rear panel allows connection to ISDN Basic
Rate Service provided by the telephone company or to a leased type of service.
Dial operation uses the ISDN Basic Rate U-interface and allows the ISU 128 to
dial out over the ISDN network. The Leased Line Service can be dedicated
2B1Q data service or a nailed-up circuit (twisted pair) that provides a dedicat-
ed connection between end points such as a limited distance modem or point-
to-point connection. When using the ISU 128 in either of these types of service,
connect the network interface to the RJ-45 connector labelled ISDN IFC.
See the appendix Connector Pinouts for network connection pin assignments.