diff --git a/drivers/isdn/hisax/lmgr.c b/drivers/isdn/hisax/lmgr.c
new file mode 100644
index 0000000..d4f86d6
--- /dev/null
+++ b/drivers/isdn/hisax/lmgr.c
@@ -0,0 +1,50 @@
+/* $Id: lmgr.c,v 1.7.6.2 2001/09/23 22:24:50 kai Exp $
+ *
+ * Layermanagement module
+ *
+ * Author       Karsten Keil
+ * Copyright    by Karsten Keil      <keil@isdn4linux.de>
+ * 
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ *
+ */
+
+#include "hisax.h"
+
+static void
+error_handling_dchan(struct PStack *st, int Error)
+{
+	switch (Error) {
+		case 'C':
+		case 'D':
+		case 'G':
+		case 'H':
+			st->l2.l2tei(st, MDL_ERROR | REQUEST, NULL);
+			break;
+	}
+}
+
+static void
+hisax_manager(struct PStack *st, int pr, void *arg)
+{
+	long Code;
+
+	switch (pr) {
+		case (MDL_ERROR | INDICATION):
+			Code = (long) arg;
+			HiSax_putstatus(st->l1.hardware, "manager: MDL_ERROR",
+				" %c %s", (char)Code, 
+				test_bit(FLG_LAPD, &st->l2.flag) ?
+				"D-channel" : "B-channel");
+			if (test_bit(FLG_LAPD, &st->l2.flag))
+				error_handling_dchan(st, Code);
+			break;
+	}
+}
+
+void
+setstack_manager(struct PStack *st)
+{
+	st->ma.layer = hisax_manager;
+}