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4 Message Reference

options

Bit

Mnemonic

Description

ATM_CFG_OPTIONS_SCRAMBLE

Enable payload scrambling

ATM_CFG_OPTIONS_COSET

Use ATM coset in HEC calculation

ATM_CFG_OPTIONS_AUTOCORRECT

Autocorrect invalid cells if possible

ATM_CFG_OPTIONS_IMA_BUNDLE

Configuration describes an IMA bundle

Note: Either Payload Scrambling or ATM Coset mode, or both, must be enabled for correct

operation. Configurations which disable both options will be rejected.

ima_frame_len

The length of the IMA frame.

Value

Mnemonic

Description

ATM_CFG_IMA_FRAME_32

32 cells per IMA frame

ATM_CFG_IMA_FRAME_64

64 cells per IMA frame

ATM_CFG_IMA_FRAME_128

128 cells per IMA frame

ATM_CFG_IMA_FRAME_256

256 cells per IMA frame

Note: For non IMA streams this field is reserved and should be set to zero.

max_frame_len

The maximum length of a reassembled (AAL) frame. Frames longer than this will be

discarded by the ATM layer.

Note: The maximum AAL frame length accepted at the ATM layer is determined by the

requirements of the full protocol stack. At present, the requirements of the MTP3 layer and

above are support for signaling units with a SIF length of less than or equal to 272 octets.

MTP3-b (and subsequently Q.2140 / Q.2110) allow frames of up to 4K octets. If a peer

sends a data frame longer than the maximum frame length parameter, the ATM layer will

discard the frame and all retransmissions resulting in the Q.SAAL link being taken out of

service.

default_vpi

A default AAL5 link will be configured for the cell stream to signal incoming active

connections. This is the vpi that will be used for this connection. The vpi must be

available in the mask configured in the ATM_MSG_CONFIG message.

default_vci

A default AAL5 link will be configured for the cell stream to signal incoming active

connections. This is the vci that will be used for this connection. Values 0, 3, and 4 are

reserved and should not be used and the vci value must be viable in the mask

specified in the ATM_MSG_CONFIG message.

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