Black Box 32144, Manual

Page: 184 / 195

32
MODEM 32144
2.8.2 V.32/208 A
UTO
-S
ELECT
M
ODE
The Quick Setup identified on the
LCD as 2-W DIAL V32/208 (shown
above) configures the modem for
V.32/208 auto-detect mode. This
means the modem will automati-
cally select V.32 or Bell 208 mode,
depending on the mode of the
originating modem. Note that the
modem will not handshake in V.22
bis, Bell 212/103, or V.21/V.22/
V.23 mode when it is configured
for V.32/208 auto-detect mode.
2.9 4-Wire Leased Line V.29 Mode
(Quick Setup 13)
The following information applies
to 4-wire leased line V.29 operation:
• The modem must be
configured for use with a 4-wire
line. If you have selected the
4-Wire Leased Line V.29 Quick
Setup, the line type will be set
automatically to the correct
setting.
• Operation is restricted to data
rates of 4800, 7200, and 9600
bps.
• Lines can be conditioned
or unconditioned.
After you select the 4-Wire
Leased Line V.29 Quick Setup,
the modem will send a training
sequence and wait for a training
response from the remote modem.
The modem will repeat the train-
ing sequence every 1.2 seconds
until the remote modem responds.
When the local modem has
established a connection with the
remote unit, the TIA/EIA status
screen will be present. Typically,
this screen will look like this:
TR MR RS CS TD
9600
CD RD
NOTE
For point-to-point 4-wire
leased line V.29 operation,
the Auto-Retrain option
should be enabled on both
modems. (Auto-Retrain is
enabled by default if you
select the 4-Wire Leased
Line V.29 Quick Setup.) If
the Auto-Retrain option is
disabled, the modem will not
transmit a training sequence
and will instead train on the
data stream from the remote
modem. Disabling Auto-
Retrain in 4-wire leased line
V.29 mode is recommended
for test purposes only. If
Auto-Retrain is disabled, it
should be disabled on both
modems.