--- a/ater/Makefile	Mon Jun 24 18:21:01 2024 +0000
+++ b/ater/Makefile	Mon Jun 24 18:48:36 2024 +0000
@@ -1,6 +1,6 @@
 PROG=	itt-ater-16
-OBJS=	main.o out_frame.o read_file.o read_ts.o record_ctrl.o subslot_rx.o \
-	tx_func.o user_cmd.o
+OBJS=	activate.o main.o out_frame.o read_file.o read_ts.o record_ctrl.o \
+	subslot_rx.o tx_func.o user_cmd.o
 HDRS=	globals.h out_frame.h read_file.h submux.h
 LIBUTIL=../libutil/libutil.a
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ater/activate.c	Mon Jun 24 18:48:36 2024 +0000
@@ -0,0 +1,73 @@
+/*
+ * Here we implement the operation of activating a new TRAU channel
+ * on a sub-timeslot.
+ */
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <osmocom/core/select.h>
+#include <osmocom/isdn/i460_mux.h>
+#include <osmocom/trau/trau_frame.h>
+
+#include "globals.h"
+#include "submux.h"
+#include "read_file.h"
+#include "out_frame.h"
+
+void cmd_activate(int argc, char **argv)
+{
+	int nr, rc;
+	bool is_efr, dtxd;
+	struct ater_subslot *at;
+	uint8_t *init_frame;
+	unsigned init_frame_count;
+
+	if (argc < 4 || argc > 5) {
+usage:		fprintf(stderr,
+			"usage: %s 0|1|2|3 fr|efr initial-frame.tul [dtxd]\n",
+			argv[0]);
+		return;
+	}
+	if (argv[1][0] < '0' || argv[1][0] > '3' || argv[1][1])
+		goto usage;
+	nr = argv[1][0] - '0';
+	if (!strcmp(argv[2], "fr"))
+		is_efr = false;
+	else if (!strcmp(argv[2], "efr"))
+		is_efr = true;
+	else
+		goto usage;
+	if (argv[4]) {
+		if (strcmp(argv[4], "dtxd"))
+			goto usage;
+		dtxd = true;
+	} else
+		dtxd = false;
+
+	at = &subslots[nr];
+	if (at->is_active) {
+		fprintf(stderr, "error: subslot %d is already active\n", nr);
+		return;
+	}
+	rc = read_binary_file(argv[3], is_efr, &init_frame, &init_frame_count);
+	if (rc < 0)
+		return;		/* error msg already printed */
+	if (init_frame_count != 1) {
+		free(init_frame);
+		fprintf(stderr, "error: %s contains more than one frame\n",
+			argv[3]);
+		return;
+	}
+
+	/* good to proceed now */
+	at->is_active = true;
+	at->is_efr = is_efr;
+	init_trau_ul_frame(nr);
+	at->ul_frame.c_bits[16] = dtxd;
+	trau_frame_from_record(init_frame, is_efr, &at->ul_frame);
+	free(init_frame);
+}

--- a/ater/globals.h	Mon Jun 24 18:21:01 2024 +0000
+++ b/ater/globals.h	Mon Jun 24 18:48:36 2024 +0000
@@ -16,3 +16,4 @@
 void cmd_record_start(int argc, char **argv);
 void cmd_record_stop(int argc, char **argv);
 void cmd_print_rx(int argc, char **argv);
+void cmd_activate(int argc, char **argv);

--- a/ater/user_cmd.c	Mon Jun 24 18:21:01 2024 +0000
+++ b/ater/user_cmd.c	Mon Jun 24 18:48:36 2024 +0000
@@ -17,6 +17,7 @@
 	char	*cmd;
 	void	(*func)(int argc, char **argv);
 } cmdtab[] = {
+	{"activ", cmd_activate},
 	{"print-rx", cmd_print_rx},
 	{"record", cmd_record_start},
 	{"record-stop", cmd_record_stop},