Paradyne COMSPHERE 3920PLUS Technical Reference Manual page 132

V22b Guard Tone: Disable
Nxt Disable 550Hz 1800Hz
This configuration option only appears when Dial Line Rate is configured for V.22bis or V.22 data rate, or when
Automode is configured for Enable.
V.22bis Guard Tone. Determines whether the V.22bis guard tone is disabled, set to 550 Hz, or set to 1800 Hz.
Disable – No guard tone.
550 Hz or 1800 Hz – When the modem is in Answer mode, it transmits the guard tone at this frequency.
NOTE: The V.22bis Guard Tone cannot be disabled in some countries.
The AT command for Disable is &G0.
The AT command for 550 Hz is &G1.
The AT command for 1800 Hz is &G2.
Train Time: Long
Nxt Long Short
This configuration option only appears when Dial Line Rate is configured for V.34 and V.32 families.
Train Time. Controls V.34 and V.32 families train time. Determines whether minimum or maximum time durations are
used during the V.34 and V.32 families handshaking sequence for both dial and 4-wire/2-wire leased-line applications.
Long – Selects long train. Use this setting whenever far-end frequency offset (phase roll) may be encountered. This is
usually only required when transmitting over satellite links.
Short – Allows the modem to train-up faster when using the V.34 and V.32 families modulation.
The AT command is S-Register S43 = n, where n is 0 for Long and 1 for Short.
V34 Symbol Rate: Automatic
Nxt Automatic 3429H 3429L 3200L 3200H 3000L 3000H 2800L 2800H 2743L 2743H 2400L 2400H
This configuration option only appears when V.34 is enabled.
V.34 Symbol Rate. Selects the symbol (or baud) rate to be used when operating with V.34 modulation on either dial or
leased lines.
Automatic – The modem automatically determines the top symbol rate that can be supported by the current line
conditions. This is the only setting that is compliant with the V.34 specification, and should not be changed unless
unusual line conditions exist.
3429L, 3200L, 3000L, 2800L, 2743L, 2400L – Fixed symbol rate with low carrier signal.
3429H, 3200H, 3000H, 2800H, 2743H, 2400H – Fixed symbol rate with high carrier signal (100 Hz above low carrier
signal).
The AT command is S-Register S21 = n, where n is:
0 = Automatic 7 = 2800H
1 = 3429L 8 = 2743L
2 = 3200L 9 = 2743H
3 = 3200H 10 = 2400L
4 = 3000L 11 = 2400H
5 = 3000H 12 = 3429H
6 = 2800L
3920-A2-GH30-40
Table 5-10
Dial Line Configuration Options — Singleport Mode A
October 1998
(3 of 4)
Configure Branch
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