Black Box 32144, Руководство пользователя

Страница: 115 / 195

81
CHAPTER 4: General Operation and Special Features
Answering a Data Call Manually
An incoming call may be answered
manually or automatically,
although to answer a data call
manually, the Auto-Answer option
must be disabled. Before the call is
received, the modem must be set to
TALK, as explained in the previous
section. The unit that will be
switched to DATA mode first must
be set for answer mode (using the
answer/originate option). The
other unit must be set for originate
mode.
NOTE
If you set the modem to talk
mode, the phone will ring,
but the modem will not
answer, even if the Auto-
Answer option is enabled.
After the phone has rung, and
you have answered it, the modem
must be set for data mode: With
the MANUAL-DIAL screen still
displayed, select DATA. This puts
the modem in data mode.
The first person to go to data
mode will hear his telephone
disconnect as his modem connects.
The other person must wait until
he hears an answer tone, and then
switch to data mode (select DATA).
When both modems are in data
mode, the data communication will
begin. The LCD will display the
status of the connection.
Terminating a Data Call
There are several ways a data call
can be terminated. One way is
through communication
software—by following the software
manufacturer’s instructions. An
alternate method is to switch to the
TALK option (talk mode) on the
MANUAL-DIAL screen, as
described in the previous section.
Another method is to drop the
DTR signal from the DTE (by
software control or by turning the
DTE off).
4.5 V.32/208 Auto-Detect Mode
When V.32/208 auto-detect mode
is enabled, the modem will
automatically select either V.32
(V.32/V.32 bis) or Bell 208
operation. These two types of
operation are described below.
4.5.1 V.32/V.32
BIS
O
PERATION
In V.32/208 auto-detect mode, an
answering modem will, upon
detection of a V.32 handshake,
operate with the following options
set as shown:
• Data format—synchronous
• V.13 operation—TX and RX
• Carrier type—constant
• CTS to EIA—RTS (CTS follows
RTS)