One SKLNG macro should be coded for each remote SLN attached to a 3705/EP
or 3745/PEP; and one should be coded for each 3270 local terminal.
The SKLNG macro is used to specify information required to initialize the
SCK. For all line types it defines the symbolic line number and the
physical paths through which the line may be attached to the system.
Other parameters should be coded depending on the line type.
- LNSY=x
- The hexadecimal symbolic line number. The SCK macros should be
coded in line number sequence, and this parameter will be used for sequence
checking. Symbolic line numbers 0 and 1 should never be coded, because
they are reserved for the RO and PRC. The first non-CRAS line number
(for example, SLC, BSC, etc.) must be equal to that specified in the
MINLS parameter of the SIP LINES macro. The symbolic line number is
used to determine the line type by reference to the SIP output. If the
user is in any doubt as to which line numbers represent which line types, he
should refer to a listing of SYSETK which defines line number ranges for each
line type.
For local 3270, each 3277 or 3284/3286 terminal is represented by a
symbolic line number. These line numbers must be consecutive and
therefore must be specified by consecutive SKLNG macros.
- PATH1
- Specifies the first or only physical path through which the line is
attached to the system. For local 3270 lines, only one path can be
defined.
- a
- One to three hex digits defining the subchannel address of the
path.
- b
- A decimal symbolic control unit number to which the line a, is
attached. The control unit type is determined from the control unit
number by reference to the SIP output. If the user has any doubt as to
which control unit numbers represent which control unit types he should refer
to a listing of SYSETK which defines control unit number ranges for EP control
units. This parameter should not be coded for local 3270s.
- c
- Code L
- d
- Indicates the switching status for each path.
- M
- Manually switchable (requiring operator command).
- A
- Automatically switchable (e.g., TPF automatically activates
an alternate path or subchannel when the line error threshold is
exceeded). Default is M.
- e
- Indicates the type of path (must be P for local 3270's)
- P
- Prime path (active subchannel for this line).
- A
- Alternate path (back up or alternate subchannel). Default is
A. If only one path is specified it must be the prime path.
- PATH2
- These parameters specify up to three more physical paths.
- PATH3
- They have the same format as the PATH1 parameter.
- PATH4
- The number of paths specified must not exceed the value defined by the
NPATH parameter of the SIP NETWK macro.
- SL=1|n
- For a BSC line: this parameter defines the number of messages that
will be sent before line turnaround occurs and messages will be
received.
- BTYPE
- For a BSC line: this parameter defines the type of line and
station.
- BSPP
- Line is a point to point line.
- BSMP
- Line is a multipoint line.
- PRIM
- Station is the primary station. (TPF wins when contention occurs in
bidding for the line). This parameter is only valid for BSC point to
point lines.
- SECD
- Station is the secondary station (TPF yields to the primary station when
contention occurs). This parameter is only valid for BSC point to point
lines.
- MAST
- Defines type of station for a multipoint line. MAST is the only
valid parameter. (TPF is responsible for polling the line.) This
parameter is only valid for BSC multipoint lines.
- YBLK
- Line uses blocked message transmission.
- NBLK
- Line does not have blocking.
- BCODE
- For a BSC line: this parameter defines type of code used on
line.
- EBCDIC
- Line uses EBCDIC codes.
- ASCII
- Line uses ASCII codes.
- YTRAN
- Line has data transparency. This parameter is valid only if EBCDIC
is specified, since TPF only supports USASCII in nontransparent mode.
- NTRAN
- Line does not have data transparency. This parameter is valid only
if EBCDIC is specified, since TPF only supports USASCII in nontransparent
mode.
- YRCPL
- Line sends and receives RCPL as a message header. This parameters
is valid only if EBCDIC is specified. YRCPL is valid only if YTRAN is
also specified since transparency is required to transmit binary data in the
RCPL.
- NRCPL
- Line does not use RCPLs. This parameters is valid only if EBCDIC is
specified.
Default values depend upon the type of BSC line. If the line is a
point to point line (BTYPE=BSPP), then the defaults are EBCDIC, YTRAN,
YRCPL. If the line is a multipoint line (BTYPE=BSMP), then the defaults
are EBCDIC, NTRAN, NRCPL.
- BSTOV=n
- For multipoint BSC lines: this parameter defines the time-out value
in seconds.
For Master stations, this value is the slow poll interval. For
tributary stations, this value is the time-out value. If no poll is
received and time out value elapses, then messages on the output queue are
returned to originator.
The value can be from 0 to 255. If the station is a tributary
station (BTYPE=(BSMP,TRIB)), then a value of 0 can not be specified.
The default value depends upon the type of station. If the station is a
master (BTYPE=(BSMP,MAST)), then the default value is 15. If the
station is a tributary (BTYPE=(BSMP,TRIB)), then the default is 5.
- BST00...
- For BSC line: these parameters define entries in the TITB table for
the line. One parameter (BST00 thru BST63) is coded for each station on
the line. The numerical part of the BSTnn parameter is the station
number and relates to the STANO parameter in the BSNCT SIP macro.
- polch
- This subparameter defines the station poll characters.
- selch
- This subparameter defines the station select characters.
- stanm
- This subparameter defines the station name.
For a point to point BSC line, only BST00 is valid. The polch and
selch parameters have no meaning and should not be specified. BST00
should be specified when station name message routing is going to be used on a
point to point line.
For a tributary station on a multipoint line, only BST00 is valid.
For a master station on a multipoint line, all BST parameters are
valid. The BST parameters should have consecutive numbers starting at
00.
The polch and selch subparameters are used to generate pointers to entries
in the BSAT table. The polch and sel characters must match an entry in
the BSAT table.
The BST parameter numbers are used to create pointers to entries in the
SNCT table (generated by SIP). Each BST parameter generates a TITB
entry. The TITB entry points to the entry in the SNCT table which has a
matching line and station number. Note, the BST parameters specified
here are numbered in decimal and the station numbers specified in SIP (BSNCT
macro, STANO parameter) are numbered in hexadecimal.