Envoy ACP/XF Configuration and Management Manual

WAN Subsystem Profiles and Modifiers for

EnvoyACP/XF

EnvoyACP/XF Configuration and Management Manual—429232-003

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Optional Modifier Descriptions

If NOSENDRNRRETRY is specified, the local station does not send RNRs when it is in

a buffer-depletion RNR state. Instead, the following actions occur (see Figure 3-9):

1. If the local station is a primary station, it sends DISC upon entering the local RNR

state. If the local station is a secondary station, it sends DM to any received frame

that is not a mode-setting command.

2. All pending application WRITE requests for the station are completed with

Guardian file-system error 163 (RNR sent).

3. Any further WRITE requests for the transmission of numbered frames received

from the application for the station are completed with Guardian file-system error

164 (Disconnected).

4. The remote station is disconnected.

5. The local station enters LDS.

Note. If the local RNR state has been set by the application, the NOSENDRNRRETRY/

NOSENDRNRRETRY modifier setting and the RNRTIMER are not processed. When this

happens, the station remains in the local send RNR state. If an application forces the local

station into RNR state when NOSENDRNRRETRY is in effect, the remote station’s RNR timer

might elapse—which would disconnect the line.

Figure 3-9. NOSENDRNRRETRY

VST021.vsd

* Upon entering RNR state, a primary station transmits DISC; whereas, a secondary station

transmits DM. Except for this minor difference, the effect of NOSENDRNRRETRY is the same

for both primary and secondary stations. The error messages returned to the application are the

same for primary and secondary stations.

Error 164

WRITE

Error 163

Buffers Are Full

DISC or DM

WRITE

Application

EnvoyACP/XF

Local Station Remote Station