Hayes Microcomputer Products PC Card - Manual (Page 42)

DIVA T/A PC Card Reference Guide 42
V.120 Configuration Commands
This section describes the V.120 Configuration commands.
Command Description
AT!E0=n V.120 N201 Tx (Maximum Transmit Frame Size):
N201 Tx (Maximum Transmit Frame Size) determines
the maximum number of octets in an information field
to be transmitted to the remote V.120 device. Valid
range is 16-260. Default: 260.
Note: If a larger frame needs to be transmitted, the
DIVA T/A segments it into V.120 fragments and expects
the remote device to perform reassembly.
AT!E1=n V.120 N201 Rx (Maximum Receive Frame Size):
N201 Rx (Maximum Receive Frame Size) determines
the maximum number of octets in an information field
to be received from the remote V.120 device. Valid
range is 16-260. Default: 260.
AT!E2=n V.120 Multiframe Mode: The V.120 protocol supports
two different transfer modes described below:
n=E
Multiframe mode is enabled (default). This mode
provides acknowledged transfers by using Information
(I) and acknowledgment (RR/RNR) frames, and
provides error correction and recovery procedures. The
link verification procedure is provided by exchanging
SABME and UA frames.
n=D
Unacknowledged mode is enabled. This mode uses
Unnumbered Information (UI) frames. The link
verification procedure is provided by exchanging XID
frames. The unacknowledged mode is less robust than
multiframe mode.
Note: The DIVA T/A may automatically switch to the
other mode if the link verification frames issued from
the remote device do not match the configured mode on
the local device. The DIVA T/A always prefers the
multiframe mode