ADTRAN Express 3000 SP, Руководство пользователя

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Chapter 3. Using the Express Configuration Program
61203153L3-20 Express 3000 SP User Manual 3-11
Flow Control
Allows communication devices (for example, the Express 3000 SP
and a PC) to deal with one device sending data at a rate higher
than the other device.
Data Call Type
Selects the Call Type according to the ISDN line configuration.
Hardware Controls the data transmission between the terminal
(PC) and the Express 3000 SP (via EIA-232 pins). Rec-
ommended for high-speed data transmission.
Software Uses characters embedded in the communication soft-
ware to control the data transmission. The control
characters are known as XON/XOFF. Typically used
in slower transmission of data.
No Control Disables any type of flow control.
Speech Directs call control software to request a Speech circuit
as the bearer capability for outgoing calls. Use with
ISDN lines configured for voice service. In some areas
voice service is less expensive than data service. A
Speech call type does not guarantee an end-to-end
digital connection with some local and long distance
carriers.
Audio Directs call control software to request a 3.1 kHz Au-
dio circuit as the bearer capability for outgoing calls.
Used with an ISDN line configured for voice service.
In some areas audio service is less expensive than data
service. An Audio call type does not guarantee an end-
to-end digital connection with some local and long
distance carriers.
Data 56kbps Directs call control software to request a 6 4kbps data
circuit that is rate-adapted down to 56 kbps.
Data 64kbps Instructs call control software to request an unrestrict-
ed 64 kbps data circuit. (Default for the Express 3000
SP.)