Cabletron Systems CSMIM-T1 manual T4=n Timer for Line Turnaround Delay Carrier On

Chapter 7: AT Commands and Registers

When the originating modem is set for V.21 or V.23 operation, :T3 determines how long the modem waits after detecting answer tone before proceeding with the connection. When :T3 is set to 0, the originating modem does not wait for answer tone.

:T4=n Timer for Line Turnaround Delay - Carrier On

Where n is an integer from 0 to 255 (in increments of 12.5 milliseconds). Default is 20 (250 milliseconds).

This command takes effect only during normal mode V.23 half-duplex connections.

After the modem turns carrier off, determines the minimum time the modem waits for the remote modem to respond before turning carrier back on again to resume sending data.

:T5=n Timer for V.23 Half-Duplex Intercharacter Delay

Where n is an integer from 0 to 255 (in increments of 12.5 milliseconds). Default is 7 (87.5 milliseconds).

This command takes effect only during normal mode V.23 half-duplex connections.

Sets the length of time the modem waits after transmitting the last data character in the transmit buffer before turning carrier off. :T5 may need to be adjusted if the local computer intercharacter time causes excessive line turnarounds.

:T6=n Timer for DCD Turn On Delay

Where n is an integer from 0 to 255, representing milliseconds. Default is 200 milliseconds (2 tenths of a second).

This command takes effect during only normal mode V.23 half-duplex connections.

Sets how long the modem waits after carrier goes on before it starts looking for data. This command may be set to exclude the turn on noise that occurs when DCD turns On during V.23 half-duplex connections.

If :T6 is set to 0, the modem waits 256 milliseconds before looking for data.

7-52 CSMIM-T1 Hardware Installation Guide