gtps4m2h | System Generation |
The BBSAT macro must be coded if there are any BSC multipoint lines directly connected to the system being generated. Otherwise it should be omitted.
The BBSAT macro is used to specify valid sets of polling and selection characters in the BSC multipoint network. They will eventually be related to specific lines in the SCK and 3745 PEP generations.
One BBSAT macro should be coded for each unique set of poll and selection characters in the network. A maximum of 64 BBSAT macros may be coded. The minimum number of BBSAT macros is equal to the maximum number of drops on any one BSC multipoint line. This is because each drop on a BSC multipoint line must be assigned a unique poll and selection sequence (i.e., one BBSAT macro). There is no requirement, however, for uniqueness of poll and selection characters across BSC multipoint lines.
This macro is used to create the BSC station address table (BSAT, segment CRS0).
The BBSAT macro is only to be coded when generating a base only system or when generating the basic subsystem in a multiple database function (MDBF) environment.
Format
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If the characters are EBCDIC, then the following hexadecimal characters are not valid:
01, 02, 03, 10, 1F, 26, 2D, 32, 37, 3D
If the characters are UASCII, then the following hexadecimal characters are not valid:
01, 02, 03, 04, 05, 10, 15, 16, 17, 1F
For a tributary station on a BSC multipoint line, the first character of the poll and selection addresses must be the same except for bit 2 of the Hex byte. Bit 2 must be 0 in the poll character and 1 in the selection character. In addition, for a tributary station, a TADDR parameter in the 3745P EP generation must be consistent with one of the BBSAT macro definitions.
Examples
Example 1: A BSC multipoint station having a poll address character of B in EBCDIC and a selection address character of X'E1' would be coded as follows:
BBSAT POLCH=C2,SELCH=E1
Example 2: A BSC multipoint station having poll address characters of A and B in ASCII format and selection address characters of a and b, also in ASCII, would be coded as follows:
BBSAT POLCH=4142,SELCH=6162,CHTYP=A
References