// Start up L1 on the given span. It defaults to E1/doubleframe. We
// disable the TX pins since we're only listening.
static void enable_l1(GTH_api *api, const char* span)
{
int result;
char pcm_name[20];
// E1s carring ISDN LAPD normally use multiframe
GTH_attribute attributes[] = { {"status", "enabled"},
{"framing", "multiframe"}
};
assert(sizeof(pcm_name) > (strlen(span) + strlen("pcm")));
strncpy(pcm_name, "pcm", sizeof pcm_name);
strncat(pcm_name, span, sizeof pcm_name);
result = gth_set(api, pcm_name, attributes, 2);
if (result != 0) {
die("<set> command failed (-v shows more information)");
}
// give L1 a chance to settle down
sleep_seconds(1);
}
// Electrical E1: disable TX pins and possibly enable -20dB monitoring
static void
enable_electrical_l1(GTH_api *api,
const char* span,
const int monitoring)
{
int result;
char span_name[20];
int n_attributes = (monitoring)?3:2;
GTH_attribute attributes[] = { {"status", "enabled"},
{"tx_enabled", "false"},
{"monitoring", "true"}
};
assert(sizeof(span_name) > (strlen(span) + strlen("pcm")));
strncpy_s(span_name, sizeof span_name, "pcm", sizeof span_name - 1);
strncat(span_name, span, sizeof span_name);
// Use <set> here: <enable> isn't supported until gth2_system_37a.
result = gth_set(api, span_name, attributes, n_attributes);
if (result != 0)
die("Setting up L1 failed. (-v switch gives more information)");
}
