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2.0 Quick Start
2.4.7 4-W
IRE
L
EASED
L
INE
V.29 M
ODE
(Q
UICK
S
ETUP
13)
The 4-Wire Leased Line V.29 Mode configures the modem for V.29
operation, for compatibility with V.29 modems. Keep these guidelines
in mind when using this mode:
• The modem must be configured for use with a 4-wire line.
• Operation is restricted to data rates of 4800, 7200, and 9600 bps.
• Lines can be conditioned or unconditioned.
After you select this Quick Setup mode, the modem will send a training
sequence and wait for a training response from the remote modem. The
modem will repeat the training sequence every 1.2 seconds until the remote
modem responds.
When the local modem has established a connection with the remote unit,
the TIE/EIA status screen will appear.
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.
V.34/V.32 Dial Backup
NOTE
Dial backup can only be used in point-to-point applications.
To prevent service interruption in the event of poor leased line conditions,
the modem can be configured for V.29 leased line operation with V.34/V.32
dial backup. This means the modem will use dial lines to automatically restore
operation when conditions on the leased lines deteriorate. (Use V.34 or V.32
modulation for dial backup.) To set up the Modem for V.29 leased line
operation with dial backup, follow these steps:
1) Select the 4-wire leased line V.29 (4-WLL V.29) Quick Setup on both the
local and remote modem.
2) One modem must be set to originate mode and the other to answer mode.
To make this selection, use the ANS/ORG DEFAULT screen on the front
panel LCD.
3) Configure the modems for leased line auto-recovery.