Visara LINCS Features - Manual (Page 61)

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Chapter 5. Host Connectivity
707021-001
Host Support for RTM
For SNA host circuits, host support is available to set RTM parameters, and to collect and
display RTM information at a Network Communication Control Facility (NCCF) operator
station.
An SNA application program can communicate with LINCS to solicit RTM information from
one logical unit (LU), or from all LUs with non-zero RTM data. When the host requests non-
zero RTM data from all LUs, only LUs with non-zero data respond, or if no LUs have collected
data, the last configured LU responds.
LINCS can be configured to transmit unsolicited RTM information when an LU-LU session is
unbound, or when an RTM counter overflows. Anytime an unsolicited RTM request is sent
inbound from an LU, RTM data for that LU is reset.
Distributed Function Terminal (DFT) Interface
LINCS can enable distributed function terminals (DFTs) to support RTM. However, because
DFTs perform their own keystroke and datastream processing, RTM support is also required
within the DFT. Before you attempt to use RTM with a DFT within your network, check to see
if RTM support is available within the device.
LINCS and an attached DFT communicate in the following manner to accomplish the
RTM function:
• When the DFT is powered on (or the host changes RTM parameters), LINCS notifies the
DFT of the RTM configuration parameters.
• When an AID key is pressed, the DFT tells LINCS to start the RTM timer.
• After the host has appropriately responded to the AID operation (based on the current RTM
end of transaction definition), the DFT tells LINCS to stop the RTM timer.
• If it is authorized to do so, LINCS updates the RTM log and the LTTI for the device. If it is
authorized to do so, the DFT displays the LTTI.
Network Asset Management
The Network Asset Management function provides product identification information for the
LINCS node and its attached devices. This information may be returned to the host when the
host solicits it using a Network Management Vector Transport (NMVT) request, called Request
Product Set ID (PSID). It may also be sent to the host in an unsolicited manner if the host
supports the Dynamic Definition of Dependent LUs (DDDLU).
The information which sent to the host is referred to as Vital Product Data (VPD) and Extended
Vital Product Data (XVPD).
Vital Product Data (VPD)
Vital Product Data (VPD) is product identification information for the LINCS node and it’s
attached devices. This data includes information such as machine type, model number, sequence
number, and plant of manufacture.
When a PSID request is received from the host, LINCS returns a PSID reply for the LINCS
node, followed by a reply for each attached device. The reply for the attached devices includes
information such as Primary LU address, port number, device type, model number, serial