Specifications

4 Message Reference
62
options
Bit
Mnemonic
Description
0
ATM_CFG_OPTIONS_SCRAMBLE
Enable payload scrambling
1
ATM_CFG_OPTIONS_COSET
Use ATM coset in HEC calculation
2
ATM_CFG_OPTIONS_AUTOCORRECT
Autocorrect invalid cells if possible
3
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
1
ATM_CFG_IMA_FRAME_32
32 cells per IMA frame
2
ATM_CFG_IMA_FRAME_64
64 cells per IMA frame
3
ATM_CFG_IMA_FRAME_128
128 cells per IMA frame
4
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.