diff --git a/sysmoOCTSIM/usb_descriptors.h b/sysmoOCTSIM/usb_descriptors.h
new file mode 100644
index 0000000..94a4212
--- /dev/null
+++ b/sysmoOCTSIM/usb_descriptors.h
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2019 sysmocom -s.f.m.c. GmbH, Author: Eric Wild <ewild@sysmocom.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+*/
+
+#ifndef USB_DESCRIPTORS_H_
+#define USB_DESCRIPTORS_H_
+
+#define CCID_NUM_CLK_SUPPORTED 4
+
+/* aggregate descriptors for the combined CDC-ACM + CCID device that we expose
+ * from sysmoQMOD */
+
+enum str_desc_num {
+	STR_DESC_MANUF = 1,
+	STR_DESC_PRODUCT,
+	STR_DESC_CONFIG,
+	STR_DESC_INTF_ACM_COMM,
+	STR_DESC_INTF_ACM_DATA,
+	STR_DESC_INTF_CCID,
+	STR_DESC_SERIAL,
+};
+
+/* a struct of structs representing the concatenated collection of USB descriptors */
+struct usb_desc_collection {
+	struct usb_dev_desc dev;
+	struct usb_config_desc cfg;
+
+	/* CDC-ACM: Two interfaces, one with IRQ EP and one with BULK IN + OUT */
+	struct {
+		struct {
+			struct usb_iface_desc iface;
+			struct usb_cdc_hdr_desc cdc_hdr;
+			struct usb_cdc_call_mgmt_desc cdc_call_mgmt;
+			struct usb_cdc_acm_desc cdc_acm;
+			struct usb_cdc_union_desc cdc_union;
+			struct usb_ep_desc ep[1];
+		} comm;
+		struct {
+			struct usb_iface_desc iface;
+			struct usb_ep_desc ep[2];
+		} data;
+	} cdc;
+
+	/* CCID: One interface with CCID class descriptor and three endpoints */
+	struct {
+		struct usb_iface_desc iface;
+		struct usb_ccid_class_descriptor class;
+		struct usb_ep_desc ep[3];
+	} ccid;
+	uint8_t str[116];
+} __attribute__((packed));
+
+#endif /* USB_DESCRIPTORS_H_ */