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.
Table 4-13 shows each Test 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.
