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COMSPHERE 3900 Series Modems
4-46 November 1996 3910-A2-GN32-30
Table 4-6
(8 of 8)
V.42/MNP/Buffer Configuration Options
RdcdAsyncBufSiz: Disable
End Disable Enable
This configuration option is only available if Async/Sync Mode is configured for Async, and Error
Control Mode is configured for BufferMode, V42MNPorBuf, MNP_or_Buffr, and LAPM_or_Bufr mode.
Reduced Asynchronous Buffer Size. When enabled, the modem’s buffer size is limited to a maximum of
20 characters.
The AT command is S-Register S97=
n
, where
n
is 0 for Disable and 1 for Enable.
Test
The Test configuration options determine specifics, such as the duration of a test, for the various
diagnostic tests available to the modem.
T
able 4-7 shows each T
est configuration option as it appears on the LCD, with the Sync Leased
factory default setting (the default value if the modem is just being installed) shown following the
colon ( : ) on the first line and with all available selections listed on the second line. Following this
is a description of the configuration option. Factory default settings are listed in Appendix F.
Table 4-7
(1 of 2)
Test Configuration Options
DTE RL (CT140): Disable
Nxt Disable Enable
DTE Remote Loopback. Controls the use of Pin 21 of the EIA-232-D/CCITT V.24 interface by the DTE to
initiate a remote loopback. An Abort command or test time-out ends this test.
This configuration option is not available if the LeasedLine Rate is configured for TMp.
H Enable
The DTE forces the modem into remote loopback when the signal on Pin 21 (CCITT 140) is turned
ON. Remote Loop ends when the signal is dropped.
H Disable
The DTE does not initiate remote loopback in response to the signal on Pin 21.
The AT command is S-Register S51=
n
, where
n
is 0 for Disable and 1 for Enable.
DTE LL (CT141): Disable
Nxt Disable Enable
DTE Local Loopback. Controls the use of Pin 18 of the EIA-232-D/CCITT V.24 interface by the DTE to
initiate a local loopback. An Abort command or test time-out ends this test.
H Enable
The DTE forces the modem into local loopback when the signal on Pin 18 (CCITT 141) is turned
ON. Local loopback ends when the signal is dropped.
H Disable
The DTE will not initiate local loopback in response to the signal on Pin 18.
The AT command is S-Register S52=
n
, where
n
is 0 for Disable and 1 for Enable.