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COMSPHERE 392xPlus Modems
4-64 November 1996 3920-A2-GN31-30
Test — Singleport Mode A
The Test configuration options determine specifics, such as the duration of a test, for the various
diagnostic tests available to the modem.
T
able 4-13 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 4-13
(1 of 2)
Test Configuration Options — Singleport Mode A
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.
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.
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.
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.
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.
Test Timeout: Disable
Nxt Disable 30sec 60sec 240sec
Test Time-out. Determines how long a test runs before aborting.
Disable – Allows a test to run indefinitely.
30, 60, or 240 seconds – Allows the test to run for 30 seconds, 60 seconds, or 240 seconds.
The AT command is S-Register S18=
n
, where
n
is 0 for Disable and 1 to 255 seconds.
Rcv Remote Loop: Enable
Nxt Enable Disable
Receive Remote Loopback Response. Determines if the modem responds to a request for a remote loopback issued
from a remote modem.
The AT command for Enable is &T4.
The AT command for Disable is &T5.