|
AID |
Attention Identifier. |
||||
|
BB,EB |
Begin Bracket, End Bracket. SNA Brackets are used to delimit transactions. In the HSM environment they can be used to carry-out a change of direction (CD) on the link. Bracketing is only of limited use with HSMs. |
||||
|
BC,EC |
Beginning of Chain and End of Chain Bits: |
||||
|
|
00 |
: |
Middle in Chain |
: |
MIC. |
|
|
01 |
: |
End of Chain |
: |
LIC. |
|
|
10 |
: |
Beginning of Chain |
: |
FIC. |
|
|
11 |
: |
Only in Chain |
: |
OIC. |
|
BETB |
3274 "Between Bracket" State. After EB and before BB (i.e., ]..here..[ ). |
||||
|
CD |
Change Direction so that the other LU has control. |
||||
|
CSI |
Bit in RH defining "Code Selection Indicator". |
||||
|
DFC |
Data Flow Control command. SNA command to control the flow of data in LU-LU sessions. |
||||
|
FIC |
First in Chain. Position of a request (RU) in an SNA Chain. |
||||
|
FMD |
Function Management Data command. SNA Command for Data transfer between LUs (LU-LU). |
||||
|
INB |
3274 "In Bracket" State. After BB and before EB (i.e., [..here..] ). |
||||
|
IPR |
Isolated Pacing Response. |
||||
|
LIC |
Last in Chain. Position of a request (RU) in an SNA Chain. |
||||
|
LU |
SNA Logical Unit, entity which partakes in SNA sessions. |
||||
|
MIC |
Middle in Chain. Position of a request (RU) in an SNA Chain. |
||||
|
OIC |
Only in Chain. |
||||
|
PEND.BB |
3274 "Pending Begin Bracket" State. A 3270 Terminal user has started to type but has not yet pressed <Enter>. |
||||
|
PLU |
SNA Primary Logical Unit; normally the application program in the Host computer. |
||||
|
PU |
SNA Physical Unit, can contain several LUs (e.g., a 3274 Cluster Controller). |
||||
|
RCV |
Receive state. |
||||
|
RH |
Request/Response Header (3 bytes). |
||||
|
RQD |
Definite Request/Response. The recipient must reply to this message. |
||||
|
RQE |
Exception Request/Response. The sender does not expect a reply unless there is a problem. |
||||
|
+RSP |
A positive (affirmative) response to an SNA request. |
||||
|
RU |
Request/Response Unit. |
||||
|
SBA |
Set Buffer Address. |
||||
|
SDT |
Start Data Traffic. |
||||
|
SLU |
SNA Secondary Logical Unit; normally a terminal or the HSM. |
||||
|
SSCP |
SNA System Services Control Point; normally resides in the Communications Controller (37x5) and responsible for controlling access to the PU and SLU. |
||||
|
TH |
Transmission Header (6 bytes). |
||||
|
WCC |
Write Control Character (3270). |
||||
|
WSF |
Write Structured Field. |
||||
|
X'NNNN |
A 4-digit hexadecimal value. |
||||