Performance data
2.3 SEND/RECEIVE interface
CP 443-1 Advanced
24 Equipment Manual, 03/2023, C79000-G8976-C256-07
• UDP frame buffering
Length of the frame buffer with buffering enabled:
2 KB
Note:
Following a buffer overflow, newly arriving frames are discarded.
2.3.2 Number of simultaneous SEND/RECEIVE calls
The number of SEND/RECEIVE calls that can be used at the same time is limited both by the
CPU and by the CP.
If the maximum number of simultaneous SEND/RECEIVE calls is exceeded, the value 8302H
(no receive resources) is indicated in the STATUS of the surplus SEND functions. This can, for
example, happen when too many SEND/RECEIVE calls are sent at the same time in OB1.
Limitation by the CPU
In productive operation, the number of SEND/RECEIVE calls that can be used at one time
depends on the CPU resources being used. Note the information on the available CPU
resources in section System environment (Page 31). The following CPU resources are
required:
• Per SEND job short (AG_SEND) or long (AG_LSEND): 1 send resource
• Per RECEIVE job short (AG_RECV): 1 receive resource
• Per RECEIVE job long (AG_LRECV): 1 send resource, 1 receive resource
• Per SPEED SEND/RECV job (AG_SSEND, AG_SRECV): 0 resources
Limitation by the CP
A maximum of 64 SEND/RECEIVE connections can be operated by the CP. At an assignment of
1 CP per CPU, the maximum number of SEND/RECEIVE calls that can be used at one time is
limited as follows:
• SEND calls short (AG_SEND):
CPU 416/417: max. 64 calls per CPU
CPU 412/414: max. 24 calls per CPU
• SEND calls long (AG_LSEND):
CPU 416/417: max. 32 calls per CPU
CPU 412/414: max. 12 calls per CPU
• RECEIVE calls short (AG_RECV):
CPU 416/417: max. 64 calls per CPU
CPU 412/414: max. 24 calls per CPU
• RECEIVE calls long (AG_LRECV): variable
The number of AG_LRECV program blocks that can be used at the same time depends on
the number of SEND calls active at the same time (see tables below).
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