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Appendix C: Command Line Reference V.120

186

SET V120 MODE {MULTIFRAME | UNACKNOWLEDGED}

Valid context: General

V.120 was designed to allow non-ISDN devices to communicate with the ISDN network. The DIVA LAN

ISDN Modem provides support for V.120, so you can connect with such legacy systems. For example, in many

countries around the world, Compuserve offers access to their network over ISDN, using the V.120 protocol.

SET V120 MAXFRAMESIZE MaxFrameSizeTx MaxFrameSizeRx

Valid context: General

Defines the maximum size of a V.120 information field that the DIVA LAN ISDN will transmit or receive.

Range: 16 to 260 bytes. Default: 260.

Note: If a larger frame needs to be transmitted, the DIVA LAN ISDN segments it into V.120 fragments and

expects the remote device to perform re-assembly.

SET V120 WINDOWSIZE Number

Valid context: General

Applies to Multiframe mode only. Defines the maximum number of sequential data frames that can be

outstanding (not acknowledged) at any given time. Range is 1 to 127. Default: 7

SET V120 MAXRETRY Count

Valid context: General

Applies to Multiframe mode only. Defines the maximum number of retransmissions of an unacknowledged

frame. An frame is considered to be unacknowledged if the remote site does not send an acknowledgement

before the retransmission timer (T200) expires. When the maximum number of retransmissions has been

attempted, a recovery process is started which may cause the connection to be terminated.

Count: Number of retransmissions. Range 1 to10. Default: 3.

SET V120 T200 RetransmissionDelay

Valid context: General

Applies to Multiframe mode only. Defines the maximum time a frame can be outstanding without an

acknowledgement from the remote. When this timer expires, the frame is considered to be lost

and retransmission is attempted. Range 1 to 255 in tenths of a second. Default: 15 (1.5 seconds).

The value specified for this timer must be less than the value specified for the Link Integrity Timer (T203).

Otherwise, default values are used for both.

SET V120 T203 LinkIntegrityDelay

Valid context: General

Applies to Multiframe mode only. Defines the maximum time the connection can remain idle without data or

control frames being exchanged. This enables you to verify that the remote device is still online and

operational, so you do not maintain the link for no reason. When this timer expires, a recovery process is

started which may cause the connection to be terminated. Range: 1 to 255 seconds. Default: 30.

The value specified for this timer must be less than the value specified for the Idle Timer. Otherwise, default

values are used for both.

SET V120 IDLETIME IdleDelay

Valid context: General

Defines the maximum amount of time the line can remain idle without the exchange of data, before the DIVA

LAN ISDN Modem disconnects the link. This enables you to reduce your communications charges by

dropping the link when no data is being transferred. Range: 0 (never disconnect, 1 to 10000 minutes. Default:

1440 minutes (24 hours).

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