MT3334HD8 User Guide
36 CommPlete Communications Server

L8 List Online Diagnostics

Default: none
The L8 command displays the modem’s online status. You can print this display and use it as a modem
status report or as diagnostic information (such as when calling Technical Sup port).
If you type +++ATL8 with the modem online, the current online status will be displayed. If you type
ATL8 with the modem in command mode, the most recent online status will be displayed. If you type
ATL8 immediately after modem power-up, the message NO INFORMATION AVAILABLE will be
displayed.
To enter this command while online, type +++ATL8<CR>. Your modem’s online status will be
displayed, listing current operating conditions such as link type, line speed, serial speed, line quality, and
reason for last disconnect.

&RN Rate Renegotiation

Default: none
The &RN command forces the modem to perform a rate renegotiation while online. To issue it, you must
first escape to command mode by issuing the +++AT<CR> command.

&RR Retrain

Default: None
The &RR command forces the modem to perform an immediate retrain while online. To issue it, you must
first escape to command mode by issuing the +++AT<CR> command.
Flow Control Commands
Flow control refers to the techniques used by data terminal equipm ent and the MT3334HD8 to pause and
resume the flow of information between them. It prevents a device from accepting more data than it can
handle. The MT3334HD8 implements flow control in both directio ns. When the MT3334HD8 halts the
flow of data, it is called flow control, and when the computer halts the flow, it is called pacing.

&BSnMaximum Reliable Block Size

n
= 0 or 1
Default: &BS1
When the modem is in reliable mode, use the &BS command to set the maximum size of a data block.
MNP Class 3 sends a 64-character block, while Classes 4 and 5 normally send blocks of 256 char acters or
less. Reducing the block size for MNP 4 and 5 may improve overall throughput when phone lines are noisy;
however, it also could slow data transfer if line quality is good.
&BS0 sets the maximum transmit block size to 64 characters.
&BS1 sets the maximum transmit block size to 256 characters.

$EBnAsynchronous Word Length

n
= 0 or 1
Default: $EB0
The MT3334HD8 can operate with either a 10-bit format (one start bit, seve n data bits, one parity bit, and
one stop bit) or an 11-bit format (one start bit, eight data bits, one parity bit, and one stop bit) in both
command and online modes.