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REQMS
RECFMS
Shutdown
The Request Maintenance Statistics (REQMS) command is sent by the SSCP to a
3708 when the Network Determination Aid Processor (NDAP) requests PU
performance statistics. Three types of requests can be made:
• Type 1 Link Test Statistics
• Type 2 Summary Counters
• Type 3 Communication Adapter Data Error Counts.
The state of the RESET/NO-RESET indicator in the REQMS request determines
whether the 3708 clears the log area where the transmitted maintenance statistics are
stored.
An REQMS request that cannot be executed by the 3708 is rejected with a negative
response. An accepted REQMS request receives a positive response and the
requested statistics (formatted as RECFMS) as an inbound message.
Record Formatted Maintenance Statistics (RECFMS) is sent by the 3708 to the
SSCP in response to an REQMS command. The 3708 does not send unsolicited
RECFMS requests to the host. The RECFMS maintenance statistics are recorded at
the host by the Network Communications Control Facility (NCCF).
When the 3708 accepts an REQMS request, it transmits the maintenance statistics
requested.
If
the REQMS specified RESET, the 3708 resets the error log area
referred to by the REQMS after the RECFMS is transmitted. Otherwise, the error
log area is not reset.
The PLU sends the Shutdown command. Receipt of this command directs the 3708
SLU to prepare for a session termination sequence. The 3708 returns a positive
response to the PLU, but data-transfer sequences are not inhibited.
The Shutdown command causes the session to enter shutdown-complete-pending
state. The pending state is maintained until the SLU completes normal flow
processing and goes between bracket (BETB). The SLU then sends the Shutdown
Complete command to the PLU.
Shutdown Complete
This command is sent by the 3708 after the Shutdown command has been received
from the host program and an end-bracket has caused the SLU to go to BETB state.
When the Shutdown Complete command is sent to the PLU, the session enters
shutdown state. When shutdown state is active, no data transmissions can be sent to
the PLU. The PLU, however, may continue to send data to the 3708.
The PLU may either terminate the session using UNBIND when the Shutdown
Complete command is received from the 3708 or use shutdown as a means of
quiescing traffic. Leaving the Shutdown Complete state requires a clear and SDT
command if the command is used to quiesce traffic.
Chapter 3. SDLC and SNA Communication
3-33
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