Specifications

4 Message Reference
60
Description
This message is sent to each board that needs to run ATM protocols to initialize all per
module options. It must be the first message sent to the module.
Parameters
The ATM_MSG_CONFIG message includes the following parameters:
options
Bit
Description
0
Use ATM Forum Idle cell format rather than ITU.
1
Use vpi and vci masks supplied rather than default masks of 0x00f (vpi) and 0x01ff 01ff 01ff 01ff
01ff 01ff 01ff 01ff 01ff 01ff 01ff 01ff 01ff 01ff 01ff 01ff (vci)
Others
Reserved for future use. Must be set to 0.
num_streams
The maximum number of cell streams the on-board ATM module is required to
simultaneously support.
Each cell stream is treated independently of the link bandwidth it consumes.
For an IMA bundle, each TDM stream within the bundle is counted separately.
vpi_mask
This bitmask is required when the option bit is set for full configuration via masks,
rather than use the default mask (0x000f), which allows vpi values 0 to 15 inclusive to
be used. The vpi and vci cannot both be 0.
vci_mask
These bitmasks are required when the option bit is set for full configuration via 16 vci
mask - one for each (of up to 16) vpi values configured. The default mask (0x01ff)
allows vci values from 0 to 511 inclusive to be used, although 0, 3, and 4 are reserved.
If fewer ports are being configured, then masks allowing more vpi/vci combinations
may be used.
Note: The number of vpi/vci combinations per cell stream multiplied by the number of cell streams
configured must not exceed 64 kbits/s.
Note: The vpi/vci mask is selected on a per board basis. Different masks may be used for each
board.