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Preface
Preface
This manual identifies the tasks involved in maintaining the IBM 3174 Establishment Controller Models 1L,
1R, 2R, 3R, 11L, 11R, 12R, and 13R and provides the information needed to keep these controllers in, or to
restore them to, good working order.
Who This Book Is For
This book is for the product-trained and support-trained IBM service representative who maintains the 3174
Establishment Controller Models 1 L, 1 R, 2R, 3R, 11 L, 11 R, 12R, and 13R
The maintenance procedures described in this manual represent a part of the overall support structure for
the 3174 Establishment Controller. This support structure,which begins at the 3174 operator level, is
described briefly below.
3174 Operator
The 3174 operator performs initial problem isolation and recording of the 3174 failure indications by
following the procedures in the 3174 User's Guide or the 3174 Customer Extended Problem Determination
manual. If the problem is other than a customer operating procedure or customer-supplied power, the
operator requests IBM service.
Product-Trained Service Representative
The product-trained service representative performs the maintenance procedures contained in this manual
to isolate a problem to a field replaceable unit
(FRU),
a communication failure, a data stream problem, an
attached-device failure, or a specific cause, such as a defective cable. If the maintenance package cannot
isolate or correct the fault, the product-trained service representative requests assistance from the next
level of the support structure.
Support-Trained Service Representative and Area-Designated Specialist
The support-trained service representative and the area-designated specialist use their in-depth knowledge
of telecommunication and of the product to continue problem determination beyond the scope of the
maintenance manual.
Preface
vii
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