User`s guide

6: BSC 2780/3780 Link Configuration Options
DC 900-1340I 179
If this option is set to normal (TTD and WACK), and safe store acknowledge is set to
enable (Section 6.16 and Section 5.4.1.7 on page 123), the BSC 2780/3780 software
transmits a WACK instead of an ACK until the client responds with a safe store
acknowledge. The BSC 2780/3780 software transmits a TTD after it transmits an ETB
block and has no more client data to send.
If this option is set to disable, the BSC 2780/3780 software does not transmit TTDs or
WACKs. This option does not affect the reception of TTDs or WACKs.
If this option is set to TTD only, the BSC 2780/3780 software transmits a TTD after it
transmits an ETB block and has no more client data to send.
If this option is set to WACK only, and safe store acknowledge is set to enable
(Section 6.16 and Section 5.4.1.7 on page 123), the BSC 2780/3780 software transmits a
WACK instead of an ACK until the client responds with a safe store acknowledge.
To set this option using the DLI configuration file, use the ttdWack parameter; for exam-
ple,
ttdWack = “normal”. See Table 7–2 on page 191.
6.25 RVI Handling Option (28)
The RVI handling option affects the course of action that the BSC 2780/3780 software
follows if it receives an RVI during the transmission of a message. See Section 5.4.3.4 on
page 149 regarding priority data.
If the continue option is selected, the BSC 2780/3780 software continues sending the
remaining blocks in a message before turning the line around to receive the priority
message.
If the abort option is selected, the BSC 2780/3780 software immediately turns the line
around after receiving an RVI on an ETB block. The aborted data blocks are returned to
the client with the
dlRead pOptArgs.usProtCommand field set to DLI_PROT_RESP_LOCAL_ACK,
and the
dlRead pOptArgs.iICPStatus field set to DLI_ICP_ERR_RVI_RCV_ABORTED.