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6. Data Structure Reference
305
6.7. L2_BLK
The L2_BLK structure is used to send and receive layer 2 information to an ISDN
interface using the cc_GetFrame( ) and cc_SndFrame( ) functions.
The structure is defined as follows:
#define MAXLEN_IEDATA 254
typedef struct
{
char sapi;
char ces;
short length;
char data[MAXLEN_DATA];
} L2_BLK, *L2_BLK_PTR;
Table 36. L2_BLK Field Descriptions
Field Description
sapi The Service Access Point Identifier (applies to BRI only, set to 0
for PRI).
ces The Connection Endpoint Suffix (applies to BRI only, set to 0 for
PRI).
length The total bytes of the following data field.
data This field contains the received frame.
6.8. MAKECALL_BLK
The MAKECALL_BLK structure contains the parameters used to specify an
outgoing call. Outgoing calls are made using the cc_MakeCall( ) function. The
parameters for outgoing calls are set when the MAKECALL Block function is
initialized. For information on initializing the MAKECALL Block, see Section
6.8.1. MAKECALL_BLK Initialization.
The structure is defined as follows:
struct is {
unsigned char BC_xfer_cap;
unsigned char BC_xfer_mode;