Paradyne COMSPHERE 3920PLUS Series, Technical Reference Manual

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COMSPHERE 392xPlus Modems
5-60 October 1998 3920-A2-GH30-40
Table 5-11
(4 of 7)
Leased Line Configuration Options — Singleport Mode
A
2W SQ Retrain: Disable
Nxt
Disable 1 2 3 4 5
This configuration option is available only if Leased Mode is 2WLL-Orig or 2WLL-Ans and affects only V.34, V.32bis, and
V.32 modulations.
2-Wire Leased Line Signal Quality Retrain. Forces the modem to retrain if the SQ (Signal Quality) LED is on for more
than the specified number of seconds (1–5).
2W SQ Retrain reduces the amount of bad data sent to the DTE when no error control is used, but greatly increases the
likelihood of retrains on impaired lines, especially when Autorate is disabled.
The factory default is Disable.
AT command is S-register S81 = n where n is 0 for Disable or 1 to 5 for 1 to 5 seconds.
Auto Dial Back: Disable
Nxt Disable Enable Circular
Automatic Dial Backup. Allows the modem to dial the number stored in directory location 1 to restore communications
with the remote modem when the leased lines fail.
Enable – The modem dials the first number in directory location one (1). If the call fails, the modem continues to dial the
number in directory one every two minutes. For example, the limitation is a ten-call attempt to the same number, with a
two-minute delay between calls. If the call is not successful after the tenth attempt, the modem waits two hours, then
resumes calling.
NOTE: Regulations for the Auto Dial Back operation varies based on the country.
Circular – The modem dials the number in directory one (1). If the call fails, the modem dials the number in the next
directory location until it is successful. The modem returns to directory one when it encounters an empty directory or the
last directory (24).
NOTE: In point-to-point applications, this configuration option must be set to Enable in both the local and remote
modems. The answering modem must have its Auto-Answer Ring Number configuration option enabled. Refer
to the Line Dialer configuration option group for information on Auto-Answer.
NOTE: When this configuration option is enabled, the originating modem attempts a dial backup for a limited number of
calls (regulations vary, based on the country). The call-limiting function resets upon completion of a manual dial
backup, a power cycle, or when using the Reset command from NMS.
The AT command is S-Register S46 = n, where n is 0 for Disable, 1 for Enable, and 2 for Circular.
Rate Auto Orig: Disable
Nxt Disable 33.6 Kbps 31.2 Kbps 28.8 Kbps 26.4 Kbps 24.0 Kbps 21.6 Kbps 19.2 Kbps 16.8 Kbps
14.4 Kbps 12.0 Kbps 9.6 Kbps 7.2 Kbps 4.8 Kbps 2.4 Kbps
Rate Auto Originate. Selects the maximum leased-line rate at which the modem will run before a rate fallback causes an
automatic dial backup.
Disable – Rate fallbacks will not cause an automatic dial backup origination.
The AT command is S-Register S24 = n, where n is:
0 = Disable
1 = 33.6 Kbps
8 = 16.8 Kbps
2 = 31.2 Kbps 9 = 14.4 Kbps
3 = 28.8 Kbps 10 = 12.0 Kbps
4 = 26.4 Kbps 11 = 9.6 Kbps
5 = 24.0 Kbps 12 = 7.2 Kbps
6 = 21.6 Kbps 13 = 4.8 Kbps
7 = 19.2 Kbps 14 = 2.4 Kbps