Eicon Networks DIVA T/A ISDN Modem manual Configuration Commands

Page 42

V.120 Configuration Commands

The following AT commands pertain to V.120 configuration on your DIVA T/A.

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.

 

Range: 16 to 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.

 

Range: 16 to 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.

 

 

AT!E3=n

V.120 K Window Size. Applicable to the multiframe mode only. K (Window Size)

 

determines the maximum number of sequential data frames that may be outstanding

 

(not acknowledged) at any given time.

 

Range: 1 to 127 frames.

 

Default: 7.

 

 

AT!E4=n

V.120 T200 (Retransmission Timer). Applicable to the multiframe mode only. T200

 

(Retransmission Timer) is the maximum time allowed to determine if a transmitted

 

frame was received by the remote device, prior to its retransmission. The unit of

 

measurement is 1/10 of a second.

 

Range: 1 to 255.

 

Default: 15 (equal to 1.5 seconds).

 

The value specified for T200 (Retransmission Timer) must be less than the value

 

specified for T203 (Link Integrity Timer) (see “AT!E6=n” on page 43). Otherwise, the

 

default values are used.

 

 

 

DIVA T/A ISDN Modem Reference Guide ◆ Page 42

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Contents Diva T/A Isdn Modem Reference Guide Eight Edition July 206-193-08 Contents What is ISDN? Diva T/A Isdn Modem Reference GuideWhat is ISDN? Isdn Communication Channels ChannelChannel Connecting to Isdn BRI and PRI Basic Rate AccessWhat is Multilink PPP? What is BACP/BOD? What is DBA? What is Always On / Dynamic Isdn AO/DI? What is Data Compression? Locating AT Commands Locating AT Commands AT Command Groups Alphabetical List of Supported AT Commands AT! Commands Alphabetical List of Supported AT CommandsAlphabetical List of Supported AT Commands AT% Commands AT& Commands AT* Commands AT Commands AT@ Commands Other AT Commands Registers AT$ Utility Commands Mini-monitor Commands General AT Commands General AT Commands Isdn Configuration Commands DefaultsValues for n Isdn Configuration Commands INS-Net64, NI-1, or 5ESS, µ law will be used default None defaultDefault1 AT!D3=nNumber. Numbers are separated by a semicolon Default null string this is an optional valueAT!N2=n AT!N3=nFor more details, refer to the Rvscom documentation AT!X56=nOn region 255 do not attempt 56k data call retry COM Port Configuration Commands COM Port Configuration Commands RingFor example, Connect Upon connection, the Diva T/A reports the DCE speedCall Control Commands Call Control Commands ATAATH Configuration Commands Configuration Commands Use the default settings AT!V0=nProfile Commands Multilink PPP Commands Multilink PPP Commands Endpoint Discriminator Class/Address AT%M3=b3c665ac11Internet Protocol IP Always On / Dynamic Isdn AT Commands Always On / Dynamic Isdn AT Commands Default 1000 bytes AT!X13=n when Bacp is disabled, seeWill be opened after the delay specified by AT!X10 AT!X14=nAT!X18 Default values for each setting, and is defined as followsDefault AT!X22=n Defined as followsConnection numbers affects the range ofAT!X21. SeeAT!X21 Default CF PPP overAT!X25=n AT!X26=nUtility Commands Start or display the Result of a Lapd trace Utility CommandsInternal TA access command reserved for VU Start or Display the Result of a PPP traceEnter the monitor on the next reset Soft reset the unit and enter the monitorStart an AO/DI X.25 Trace Register Commands AT?Register Commands Analog Device Commands Analog Device Commands AT*FnEnable with default values default To be disabledDisable. Recommended for modem/fax calls Enable using same terminal endpoint identifier as data portMini-monitor Commands AT Command Result Codes AT Command Result Codes ConnectCarrier Connect Connect 1200T/75R Protocol Transparent ModeConnect 75T/1200R Protocol NoneIndex BACP/BOD
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