IBM 3270 Manual page 274

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Appendix K. Response Time Monitor (RTM) Customizing
Information
This appendix provides the background.information needed to answer the
customizing questions for the RTM function (sequence numbers 127 and
128). It also provides descriptions of sequence numbers 127 and 128.
Further description of the RTM function is contained in the 3274 Control
Unit Description and Programmer's Guide, GA23-0061.
RTM Requirements
Host Interface
The RTM function is available on 3274 Models 31A, 31C, 31D, and 51C.
Configuration Support C is required.
An RTM timer card (special feature 6101) must be installed in the control
unit.
Display devices for which response times can be measured are the 6850
Displaywriter, the IBM 3270 Personal Computer, and the 3178, 3179, 3180,
3277, 3278, and 3279 display stations. Distributed function terminals such
as the 3290 Information Panel are also supported through a special
interface.
The RTM function has a host interface for SNA communications. Although
IBM does not provide host support programming at this time, it is IBM's
intent to provide host programming support for the IBM 3274 Response
Time Monitor function. When introduced, the support will be an offering
that will run on the IBM System/370, 4300, 303X, and 308X products. It will
collect response time data from the 3274 in SNA mode and will display that
information to network operations personnel. Further information on the
availability of this package will be provided at a later date.
No host programming is required to use the 3274 RTM function for 3270
subsystem display of response times.
For BSC and non-SNA local channels, no host interface is provided in
RTM, and response time display is available only at the 327 4 subsystem.
Appendix K. Response Time Monitor (RTM) Customizing Information
K-1