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Configuration Support A
Configuration Support B (#9111)
Configuration Support C (#9112)
This configuration support is shipped with all 3274s unless configuration support
B
or C
is specified. It is the base level of 3274 support including base color on attached
terminals,plus support of solicitation of summary maintenance statistics from a 3274
ModellC or 5lC with SNA/SDLC IML.
(Models lA, lC, lD, 5lC only). This support provides support for all 3270 functions
included in configuration support A, plus the ability to attach 3278 Display Station
Model 5's, and support for the following functions:
• Pacing of inbound message traffic (Models lA, IC/SNA, 5IC/SNA)
• Automatic session recovery in both single and multidomain networks (Modell C/SNA)
• Host notification of changes in the power on/off status at attached terminals (Models
IA and lC/SNA, 51C/SNA)
This support provides support for all 3270 functions included in configuration B plus
support for the following additional functions: .
• Structured field and attribute processing (SF
AP)
• Programmed symbols (PS) on attached terminals
• Extended color on attached terminals
• Extended highlighting
• Decompression of
PS
load data
• Switched network operation (SNA/SDLC)
• BSC text blocking
• BSC transparency
Encrypt/Decrypt Feature (3274 Models lC and SIC)
It is the customer's responsibility to install a copy of the secondary logical unit (LU) key
(the terminal master key) in the 3274 Control Unit Model IC or 51 C equipped with the
Encrypt/Decrypt feature (#3680). This should be done by someone in a position of trust,
such as a security officer. Once the terminal master key has been installed in the 3274,
the 3274 generates a verification pattern based on the terminal master key. A master-key
verfication procedure can be performed by any operator without compromising the
security of the Encrypt/Decrypt feature. A mercury battery, IBM Part 1743456, is
installed in the 3274 to sustain the terminal master key when the 3274 power is off.
Replacing this battery, or its equivalent, is also a customer responsibility. Procedures to
install and verify the terminal master key, and to replace the mercury battery, are
described in IBM 3274 Control Unit Operator's Guide, GA23-0023.
The Encrypt/Decrypt feature should be installed on a new 3274 before the initial
customizing is performed. If it is installed on a customized 3274, recustomizing is
necessary after installation.
~1he
response to sequence number 352 (Encrypt/Decrypt)
must be changed to a I . '
Refer also to IBM Cryptographic Subsystem Concepts and Facilities, GA22-9063, for
background information, and to IBM 3270 Information Display System: Component
Description, GA27-2749, for programming information.
Chapter 1. Planning and Setup
1-5
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