z/OS Communications Server: ACF/TAP Trace Analysis Handbook
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SNA summary reports

z/OS Communications Server: ACF/TAP Trace Analysis Handbook
GC27-3645-00

The selection parameter is SSPRT.

This topic contains SNA summary reports. See the following figures:

ACF/TAP formats the report in a compact one-line-per-message format but still contains the essential SNA and SDLC protocol information. The information about this report is presented in a vertical format so changes in a bit setting, from transmission to transmission can be easily detected.

The report title lines identify the definition of each column; single characters or blanks identify the setting of each field.

Table 1 describes the column headers and the trace data contained in this report type. To locate this information about the sample reports, reference the numbers (n) listed in this table to the corresponding numbers (n) shown in the sample reports.

Table 1. SNA summary report description
Reference number (n) Report column headers and the trace data
1 The page heading contains the report name, report parameter, and the date the report was printed or displayed.
2
MESSAGE NUMBER
The ACF/TAP-assigned number for this message.
3
TYPE
This field indicates the trace type:
B
Buffer or PIU
G
GPT
L
Line
N
NTO trace
T
TG trace
4
DIRECTION
Direction pertains to the host for buffer trace and to NCP for line trace.
I
Inbound
O
Outbound
5
SDLC ADDRESS
(TIME/SDLC: Alternate (ALT) report)
TIME (Alternate report only)
Timestamp for the entry.
SDLC ADDRESS
The A field of the SDLC F-A-C-BCC-F frame.
CMND/RESP
SDLC frame type.
C
Command
R
Response
POLL/FINAL
Setting of SDLC poll/final bit in the SDLC "C" (command) field.
S
Bit is set.
Blank
Bit is not set.
RECEIVE
The receive count in decimal from the SDLC "C" field for information and supervisory frames
SEND
Send count in decimal from the SDLC "C" field for information and supervisory frames.
TYPE CMD
SDLC command type.
I
Information frame.
S
Supervisory frame.
N
Nonsequenced frame.
6
TRANSMISSION HEADER
This header includes the following fields:
FORMAT IDENTIFIER (FID)
Transmission header type.
0
FIDO
1
FID1
2
FID2
3
FID3
4
FID4
C
NLP (HPR)
F/M/L/ ( =ENTIRE) SEGMENT
Mapping indicator.
F
First segment
M
Middle segment
L
Last segment
Blank
Entire segment
EXPEDITED
E
Expedited
Blank
Not expedited
NETWORK NAMES (Alternate report only)
This is the network name associated with the network address.
NETWORK ADDRESSES
  • 2-byte (FID0 and FID1) network addresses
  • 1-byte (FID2) network addresses (or 17-bit FID2 LFSID)
  • 4-byte subarea fields and the 2-byte element addresses (FID4) in the TH.
The origin address always precedes the destination address (FID2).
SEQNO
Transmission header sequence number in hexadecimal.
COUNT
Transmission header data count field converted to decimal.
FROM/TO PU (FID3)
Local session identifier.
FID3 LSID
SSCP/LU identifier.
S
SSCP
Blank
Logical unit
FROM/TO SSCP (FID0):
PU/LU indicator
P
Physical unit
Blank
Logical unit
7
REQUEST HEADER
This header includes the following fields:
REQUEST(Q)/RESPONSE(S)
Setting of request or response indicator in the request header of a data entry. This can be one of the following values:
Q
Request
S
Response
+
Positive response
-
Negative response
SC/DFC/NC/ ( =FMDATA) RU
Request or response unit category. This can be one of the following values:
S
Session control
D
Data flow control
N
Network control
Blank
FM data
FORMATTED
Format indicator. This can be one of the following values:
F
Formatted.
Blank
Unformatted
F/M/L( =ONLY) CHAIN
Chaining control. It can have one of the following values:
F
First request or response unit in chain.
M
Middle request or response unit in chain.
L
Last request or response unit in chain.
Blank
Only request or response unit in chain.
REQUEST/RESPONSES
Response bits settings. It can have one of the following values:
DR1
FME bit is set.
DR2
RN bit is set.
EXCEPTION
Exception bit is set.
Blank
No bits are set.
PACING INDICATOR
P
Bit is set.
Blank
Bit is not set.
7 (Continued)
BEGIN BRACKET INDICATOR
B
Bit is set.
Blank
Bit is not set.
END BRACKET INDICATOR
E
Bit is set.
C
Conditional end bracket is set.
Blank
Neither bit is set.
CHANGE DIRECTION IND (Indicator):
S
bit is not set.
Blank
Bit is not set.
ALT CODE
Code selection indicator. It can have the following values:
A
Bit is set.
Blank
Bit is not set.
COMMAND
The abbreviation of the network control, session control, or data flow control command or response, or the abbreviation of the FM data of an SSCP network services command or response, or the BTU command of a BSC device.
SENSE
The 4 bytes of sense data if the sense data bit is set in the request header.

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