Digicom COMSPHERE 3911 User Manual

3910-A2-GN32-40

September 1998

V27bis Train:  Short
Nxt   Short   Long

V.27bis Train. Controls the train time for V.27bis operation.

The AT command is S-Register S70=n, where n is 0 for Short and 1 for Long.

V29 TrainOnData:  Disable
Nxt   Disable   Enable

V.29 Train On Data. When enabled, the modem receiver can train based upon the incoming data or a
training sequence from the distant modem. This function is necessary for a remote (tributary) modem in a
V.29 multipoint network and is recommended for a control modem as well.

The AT command is S-Register S92=n, where n is 0 for Disable and 1 for Enable.

V29 Retrain:  Enable
Nxt   Disable   Enable

V.29 Retrain. When enabled, the modem transmits a training sequence whenever it receives one. This
configuration option should normally be disabled for control modems.

The AT command is S-Register S93=n, where n is 0 for Enable and 1 for Disable.

V29 Link Config:  PointToPoint
Nxt   PointToPoint   Multipoint

V.29 Link Configuration. Selects point-to-point or multipoint operation.

NOTE: Remote mode and the Cloning function are not available when configured for V.29 Multipoint.

The AT command is S-Register S94=n, where n is 0 for PointToPoint and 1 for Multipoint.

TMp Train Time:  50
Nxt   50   10   20   100   200   300

Trellis Multipoint (TMp) Train Time. Defines the length of time energy is sent from the tributary modem to the
control modem. More severe line conditions require longer time selections.

The AT command is S-Register S95=n, where n is 0 for 10 milliseconds, 1 for 20 milliseconds, 2 for 50
milliseconds, 3 for 100 milliseconds, 4 for 200 milliseconds, and 5 for 300 milliseconds.

TMp TxPreemphasis:  Disable
Nxt   Disable   Enable

Trellis Multipoint (TMp) Transmit Preemphasis. Provides amplification for frequencies above the carrier
frequency to compensate for high frequency line attenuation.

The AT command is S-Register S96=n, where n is 0 for Disable and 1 for Enable.