Black Box 32144 Manual page 116

MODEM 32144
4.5.2 B 208 O
ELL
In V.32/208 auto-detect mode, an
answering modem will, upon
detection of an originating Bell
208B modem, operate with the
following options set as shown:
• Data format—synchronous
• V.13 operation—off
• Carrier type—switched
The originating Bell 208 modem
must be configured to detect the
Bell 208 answer tone before it goes
to data mode. (Some 208 modems
may not have this option.)
4.5.3 A
UTOMATIC
When the modem is configured for
V.32/208 auto-select mode and in
answer mode, it will not handshake
in V.22 bis, Bell 212/103 or
V.21/V.22, V.23 mode.
4.6 V.13 Operation
The modem can be configured for
CCITT V.13 operation (which
emulates half duplex operation)
for either point-to-point or
multidrop applications. (The
correct options for these
applications are identified in
Chapter 3.) The modem normally
operates in full duplex; however,
some applications (such as certain
network environments) may
require control of a remote CD
signal by a local Request to Send
(RTS) signal. V.13 operation allows
82
PERATION
F
ALLBACK
local RTS control of a remote CD
signal without actual ON-OFF
switching of the modem carrier.
The following explains how the
modem will respond to RTS signals
when it is configured for V.13
operation:
When RTS is raised high by the
terminal, the V.13 ON PATTERN
will be sent. The modem will then
raise CTS (and data can be sent).
When RTS is brought low, the V.13
IDLE PATTERN will be sent, and
the modem will drop CTS. (If V.13
TX is enabled but the modem data
pump is not ready to send, for
example, if it is training or
retraining, raising RTS will cause
CTS to be raised, but the V.13 ON
PATTERN will not be sent.) When
V.13 RX is enabled, CD will turn
ON if the V.13 ON PATTERN is
detected; CD will turn OFF if the
V.13 IDLE PATTERN is detected or
if the modem retrains, loses carrier,
or is reset.
4.7 DTR Dialing
NOTE
To use DTR dialing in V.25
bis or Penril mode, you must
use the Summary Setup
feature, as explained in
Chapters 6 (V.25 bis) and 7
(Penril).