diff --git a/mcdp/src/ch/ntb/usb/Device.java b/mcdp/src/ch/ntb/usb/Device.java
index 2d40a02..fa05bb8 100644
--- a/mcdp/src/ch/ntb/usb/Device.java
+++ b/mcdp/src/ch/ntb/usb/Device.java
@@ -5,23 +5,46 @@ import java.util.logging.Level;
 import ch.ntb.usb.logger.LogUtil;
 import ch.ntb.usb.logger.UsbLogger;
 
+/**
+ * This class represents an USB device.<br>
+ * To get an instance of an USB device use <code>USB.getDevice(...)</code>.
+ * 
+ * @author schlaepfer
+ * 
+ */
 public class Device {
 
 	private static UsbLogger logger = LogUtil.ch_ntb_usb;
 
 	private static final int TIMEOUT_ERROR_CODE = -116;
 
-	public int MAX_DATA_SIZE = USB.MAX_DATA_SIZE;
+	private int maxPacketSize;
 
 	private int idVendor, idProduct, configuration, interface_, altinterface;
 
 	private int usb_dev_handle;
 
-	Device(short idVendor, short idProduct) {
+	protected Device(short idVendor, short idProduct) {
+		maxPacketSize = -1;
 		this.idVendor = idVendor;
 		this.idProduct = idProduct;
 	}
 
+	/**
+	 * Opens the device and claims the specified configuration, interface and
+	 * altinterface.<br>
+	 * First the bus is enumerated. If the device is found its descriptors are
+	 * read and the <code>maxPacketSize</code> value is updated. If no
+	 * endpoints are found in the descriptors an exception is thrown.
+	 * 
+	 * @param configuration
+	 *            the desired configuration
+	 * @param interface_
+	 *            the desired interface
+	 * @param altinterface
+	 *            the desired alternative interface
+	 * @throws USBException
+	 */
 	public void open(int configuration, int interface_, int altinterface)
 			throws USBException {
 		this.configuration = configuration;
@@ -44,6 +67,9 @@ public class Device {
 			throw new USBException("LibusbWin.usb_get_busses(): "
 					+ LibusbWin.usb_strerror());
 		}
+
+		maxPacketSize = -1;
+
 		// search for device
 		while (bus != null) {
 			Usb_Device dev = bus.devices;
@@ -59,6 +85,25 @@ public class Device {
 								+ LibusbWin.usb_strerror());
 					} else {
 						usb_dev_handle = res;
+						// get endpoint wMaxPacketSize
+						Usb_Config_Descriptor[] confDesc = dev.config;
+						for (int i = 0; i < confDesc.length; i++) {
+							Usb_Interface[] int_ = confDesc[i].interface_;
+							for (int j = 0; j < int_.length; j++) {
+								Usb_Interface_Descriptor[] intDesc = int_[j].altsetting;
+								for (int k = 0; k < intDesc.length; k++) {
+									Usb_Endpoint_Descriptor[] epDesc = intDesc[k].endpoint;
+									for (int l = 0; l < epDesc.length; l++) {
+										Math.max(epDesc[l].wMaxPacketSize,
+												maxPacketSize);
+									}
+								}
+							}
+						}
+						if (maxPacketSize <= 0) {
+							throw new USBException(
+									"No USB endpoints found. Check the device configuration");
+						}
 					}
 				}
 				dev = dev.next;
@@ -71,21 +116,21 @@ public class Device {
 					+ " and idProduct 0x"
 					+ Integer.toHexString(idProduct & 0xFFFF) + " not found");
 		}
-		USB.claim_interface(usb_dev_handle, configuration, interface_,
-				altinterface);
+		claim_interface(usb_dev_handle, configuration, interface_, altinterface);
 	}
 
 	public void close() throws USBException {
 		if (usb_dev_handle <= 0) {
 			throw new USBException("invalid device handle");
 		}
-		USB.release_interface(usb_dev_handle, interface_);
+		release_interface(usb_dev_handle, interface_);
 		if (LibusbWin.usb_close(usb_dev_handle) < 0) {
 			usb_dev_handle = 0;
 			throw new USBException("LibusbWin.usb_close: "
 					+ LibusbWin.usb_strerror());
 		}
 		usb_dev_handle = 0;
+		maxPacketSize = -1;
 		logger.info("device closed");
 	}
 
@@ -107,8 +152,23 @@ public class Device {
 		logger.info("device reset");
 	}
 
-	public int bulkwrite(int out_ep_address, byte[] data, int length, int timeout)
-			throws USBException {
+	/**
+	 * Write data to the device using a bulk transfer.<br>
+	 * 
+	 * @param out_ep_address
+	 *            endpoint address to write to
+	 * @param data
+	 *            data to write to this endpoint
+	 * @param length
+	 *            length of the data
+	 * @param timeout
+	 *            amount of time in ms the device will try to send the data
+	 *            until a timeout exception is thrown
+	 * @return the actual number of bytes written
+	 * @throws USBException
+	 */
+	public int bulkwrite(int out_ep_address, byte[] data, int length,
+			int timeout) throws USBException {
 		if (usb_dev_handle <= 0) {
 			throw new USBException("invalid device handle");
 		}
@@ -118,8 +178,8 @@ public class Device {
 		if (length <= 0) {
 			throw new USBException("size must be > 0");
 		}
-		int lenWritten = LibusbWin.usb_bulk_write(usb_dev_handle, out_ep_address,
-				data, length, timeout);
+		int lenWritten = LibusbWin.usb_bulk_write(usb_dev_handle,
+				out_ep_address, data, length, timeout);
 		if (lenWritten < 0) {
 			if (lenWritten == TIMEOUT_ERROR_CODE) {
 				throw new USBTimeoutException("LibusbWin.usb_bulk_write: "
@@ -141,6 +201,19 @@ public class Device {
 		return lenWritten;
 	}
 
+	/**
+	 * @param in_ep_address
+	 *            endpoint address to read from
+	 * @param data
+	 *            data buffer for the data to be read
+	 * @param size
+	 *            the maximum requested data size
+	 * @param timeout
+	 *            amount of time in ms the device will try to receive data until
+	 *            a timeout exception is thrown
+	 * @return the actual number of bytes read
+	 * @throws USBException
+	 */
 	public int bulkread(int in_ep_address, byte[] data, int size, int timeout)
 			throws USBException {
 		if (usb_dev_handle <= 0) {
@@ -152,8 +225,8 @@ public class Device {
 		if (size <= 0) {
 			throw new USBException("size must be > 0");
 		}
-		int lenRead = LibusbWin.usb_bulk_read(usb_dev_handle, in_ep_address, data,
-				size, timeout);
+		int lenRead = LibusbWin.usb_bulk_read(usb_dev_handle, in_ep_address,
+				data, size, timeout);
 		if (lenRead < 0) {
 			if (lenRead == TIMEOUT_ERROR_CODE) {
 				throw new USBTimeoutException("LibusbWin.usb_bulk_read: "
@@ -175,28 +248,112 @@ public class Device {
 		return lenRead;
 	}
 
+	/**
+	 * Claim an interface to send and receive USB data.
+	 * 
+	 * @param usb_dev_handle
+	 *            the handle of the device <b>(MUST BE VALID)</b>
+	 * @param configuration
+	 *            the configuration to use
+	 * @param interface_
+	 *            the interface to claim
+	 * @param altinterface
+	 *            the alternative interface to use
+	 * @throws USBException
+	 *             throws an USBException if the action fails
+	 */
+	private void claim_interface(int usb_dev_handle, int configuration,
+			int interface_, int altinterface) throws USBException {
+		if (LibusbWin.usb_set_configuration(usb_dev_handle, configuration) < 0) {
+			throw new USBException("LibusbWin.usb_set_configuration: "
+					+ LibusbWin.usb_strerror());
+		}
+		if (LibusbWin.usb_claim_interface(usb_dev_handle, interface_) < 0) {
+			throw new USBException("LibusbWin.usb_claim_interface: "
+					+ LibusbWin.usb_strerror());
+		}
+		if (LibusbWin.usb_set_altinterface(usb_dev_handle, altinterface) < 0) {
+			throw new USBException("LibusbWin.usb_set_altinterface: "
+					+ LibusbWin.usb_strerror());
+		}
+		logger.info("interface claimed");
+	}
+
+	/**
+	 * Release a previously claimed interface.
+	 * 
+	 * @param dev_handle
+	 *            the handle of the device <b>(MUST BE VALID)</b>
+	 * @param interface_
+	 *            the interface to claim
+	 * @throws USBException
+	 *             throws an USBException if the action fails
+	 */
+	private void release_interface(int dev_handle, int interface_)
+			throws USBException {
+		if (LibusbWin.usb_release_interface(dev_handle, interface_) < 0) {
+			throw new USBException("LibusbWin.usb_release_interface: "
+					+ LibusbWin.usb_strerror());
+		}
+		logger.info("interface released");
+	}
+
+	/**
+	 * @return the product ID of the device.
+	 */
 	public int getIdProduct() {
 		return idProduct;
 	}
 
+	/**
+	 * @return the vendor ID of the device.
+	 */
 	public int getIdVendor() {
 		return idVendor;
 	}
 
+	/**
+	 * @return the alternative interface. This value is only valid after opening
+	 *         the device.
+	 */
 	public int getAltinterface() {
 		return altinterface;
 	}
 
+	/**
+	 * @return the current configuration used. This value is only valid after
+	 *         opening the device.
+	 */
 	public int getConfiguration() {
 		return configuration;
 	}
 
+	/**
+	 * @return the current interface. This value is only valid after opening the
+	 *         device.
+	 */
 	public int getInterface() {
 		return interface_;
 	}
 
+	/**
+	 * @return the current device handle. This value is only valid after opening
+	 *         the device.
+	 */
 	public int getUsb_dev_handle() {
 		return usb_dev_handle;
 	}
 
+	/**
+	 * Returns the maximum packet size in bytes which is allowed to be
+	 * transmitted at once.<br>
+	 * The value is determined by reading the endpoint descriptor(s) when
+	 * opening the device. It is invalid before the device is opened!
+	 * 
+	 * @return the maximum packet size
+	 */
+	public int getMaxPacketSize() {
+		return maxPacketSize;
+	}
+
 }
diff --git a/mcdp/src/ch/ntb/usb/LibusbWin.java b/mcdp/src/ch/ntb/usb/LibusbWin.java
index af174f7..918eddc 100644
--- a/mcdp/src/ch/ntb/usb/LibusbWin.java
+++ b/mcdp/src/ch/ntb/usb/LibusbWin.java
@@ -1,8 +1,6 @@
 package ch.ntb.usb;
 
 public class LibusbWin {
-	
-	private static final String sysDir = "C:/Windows";
 
 	// Core
 	/**
@@ -15,8 +13,8 @@ public class LibusbWin {
 	/**
 	 * <code>usb_find_busses</code> will find all of the busses on the system.
 	 * 
-	 * @return Returns the number of changes since previous call to this
-	 *         function (total of new busses and busses removed).
+	 * @return the number of changes since previous call to this function (total
+	 *         of new busses and busses removed).
 	 */
 	public static native int usb_find_busses();
 
@@ -24,8 +22,8 @@ public class LibusbWin {
 	 * <code>usb_find_devices</code> will find all of the devices on each bus.
 	 * This should be called after <code>usb_find_busses</code>.
 	 * 
-	 * @return Returns the number of changes since the previous call to this
-	 *         function (total of new device and devices removed).
+	 * @return the number of changes since the previous call to this function
+	 *         (total of new device and devices removed).
 	 */
 	public static native int usb_find_devices();
 
@@ -35,7 +33,7 @@ public class LibusbWin {
 	 * support C calling convention and can use shared libraries, but don't
 	 * support C global variables (like Delphi).
 	 * 
-	 * @return The structure of all busses and devices. <b>Note:</b> The java
+	 * @return the structure of all busses and devices. <b>Note:</b> The java
 	 *         objects are copies of the C structs.
 	 */
 	public static native Usb_Bus usb_get_busses();
@@ -48,7 +46,7 @@ public class LibusbWin {
 	 * 
 	 * @param dev
 	 *            The device to open.
-	 * @return Returns a handle used in future communication with the device.
+	 * @return a handle used in future communication with the device.
 	 */
 	public static native int usb_open(Usb_Device dev);
 
@@ -108,7 +106,7 @@ public class LibusbWin {
 	 * 
 	 * @param dev_handle
 	 *            The handle to the device.
-	 * @return Returns 0 on success or < 0 on error.
+	 * @return 0 on success or < 0 on error.
 	 */
 	public static native int usb_reset(int dev_handle);
 
@@ -155,7 +153,7 @@ public class LibusbWin {
 	 * @param bytes
 	 * @param size
 	 * @param timeout
-	 * @return number of bytes written/read or < 0 on error.
+	 * @return the number of bytes written/read or < 0 on error.
 	 */
 	public static native int usb_control_msg(int dev_handle, int requesttype,
 			int request, int value, int index, byte[] bytes, int size,
@@ -171,7 +169,7 @@ public class LibusbWin {
 	 * @param langid
 	 * @param buf
 	 * @param buflen
-	 * @return number of bytes returned in buf or < 0 on error.
+	 * @return the number of bytes returned in buf or < 0 on error.
 	 */
 	public static native int usb_get_string(int dev_handle, int index,
 			int langid, String buf, int buflen);
@@ -186,7 +184,7 @@ public class LibusbWin {
 	 * @param index
 	 * @param buf
 	 * @param buflen
-	 * @return number of bytes returned in buf or < 0 on error.
+	 * @return the number of bytes returned in buf or < 0 on error.
 	 */
 	public static native int usb_get_string_simple(int dev_handle, int index,
 			String buf, int buflen);
@@ -204,7 +202,7 @@ public class LibusbWin {
 	 * @param index
 	 * @param buf
 	 * @param size
-	 * @return number of bytes read for the descriptor or < 0 on error.
+	 * @return the number of bytes read for the descriptor or < 0 on error.
 	 */
 	public static native int usb_get_descriptor(int dev_handle, byte type,
 			byte index, String buf, int size);
@@ -220,7 +218,7 @@ public class LibusbWin {
 	 * @param index
 	 * @param buf
 	 * @param size
-	 * @return number of bytes read for the descriptor or < 0 on error.
+	 * @return the number of bytes read for the descriptor or < 0 on error.
 	 */
 	public static native int usb_get_descriptor_by_endpoint(int dev_handle,
 			int ep, byte type, byte index, String buf, int size);
@@ -235,7 +233,7 @@ public class LibusbWin {
 	 * @param bytes
 	 * @param size
 	 * @param timeout
-	 * @return number of bytes written on success or < 0 on error.
+	 * @return the number of bytes written on success or < 0 on error.
 	 */
 	public static native int usb_bulk_write(int dev_handle, int ep,
 			byte[] bytes, int size, int timeout);
@@ -249,7 +247,7 @@ public class LibusbWin {
 	 * @param bytes
 	 * @param size
 	 * @param timeout
-	 * @return number of bytes read on success or < 0 on error.
+	 * @return the number of bytes read on success or < 0 on error.
 	 */
 	public static native int usb_bulk_read(int dev_handle, int ep,
 			byte[] bytes, int size, int timeout);
@@ -264,7 +262,7 @@ public class LibusbWin {
 	 * @param bytes
 	 * @param size
 	 * @param timeout
-	 * @return number of bytes written on success or < 0 on error.
+	 * @return the number of bytes written on success or < 0 on error.
 	 */
 	public static native int usb_interrupt_write(int dev_handle, int ep,
 			byte[] bytes, int size, int timeout);
@@ -278,7 +276,7 @@ public class LibusbWin {
 	 * @param bytes
 	 * @param size
 	 * @param timeout
-	 * @return number of bytes read on success or < 0 on error.
+	 * @return the number of bytes read on success or < 0 on error.
 	 */
 	public static native int usb_interrupt_read(int dev_handle, int ep,
 			byte[] bytes, int size, int timeout);
@@ -286,13 +284,13 @@ public class LibusbWin {
 	/**
 	 * Returns the error string after an error occured.
 	 * 
-	 * @return error sring.
+	 * @return the last error sring.
 	 */
 	public static native String usb_strerror();
 
-	/*******************************************************************/
+	/** **************************************************************** */
 
 	static {
-		System.load(sysDir + "/system32/LibusbWin.dll");
+		System.loadLibrary("LibusbWin.dll");
 	}
 }
\ No newline at end of file
diff --git a/mcdp/src/ch/ntb/usb/USB.java b/mcdp/src/ch/ntb/usb/USB.java
index 700d104..da726a6 100644
--- a/mcdp/src/ch/ntb/usb/USB.java
+++ b/mcdp/src/ch/ntb/usb/USB.java
@@ -6,13 +6,25 @@ import java.util.LinkedList;
 import ch.ntb.usb.logger.LogUtil;
 import ch.ntb.usb.logger.UsbLogger;
 
+/**
+ * This class manages all USB devices and defines some USB specific constants.
+ * 
+ * @author schlaepfer
+ * 
+ */
 public class USB {
 
 	/**
-	 * The maximal data size in bytes which is allowed to be transmitted at
-	 * once.
+	 * The maximum packet size of a bulk transfer when operation in highspeed
+	 * (480 MB/s) mode.
 	 */
-	public static final int MAX_DATA_SIZE = 512;
+	public static int HIGHSPEED_MAX_BULK_PACKET_SIZE = 512;
+
+	/**
+	 * The maximum packet size of a bulk transfer when operation in fullspeed
+	 * (12 MB/s) mode.
+	 */
+	public static int FULLSPEED_MAX_BULK_PACKET_SIZE = 64;
 
 	private static UsbLogger logger = LogUtil.ch_ntb_usb;
 
@@ -33,9 +45,11 @@ public class USB {
 		// check if this device is already registered
 		Device dev = getRegisteredDevice(idVendor, idProduct);
 		if (dev != null) {
+			logger.info("return already registered device");
 			return dev;
 		}
 		dev = new Device(idVendor, idProduct);
+		logger.info("create new device");
 		devices.add(dev);
 		return dev;
 	}
@@ -59,54 +73,4 @@ public class USB {
 		}
 		return null;
 	}
-
-	/**
-	 * Claim an interface to send and receive USB data.
-	 * 
-	 * @param usb_dev_handle
-	 *            the handle of the device <b>(MUST BE VALID)</b>
-	 * @param configuration
-	 *            the configuration to use
-	 * @param interface_
-	 *            the interface to claim
-	 * @param altinterface
-	 *            the alternative interface to use
-	 * @throws USBException
-	 *             throws an USBException if the action fails
-	 */
-	static void claim_interface(int usb_dev_handle, int configuration,
-			int interface_, int altinterface) throws USBException {
-		if (LibusbWin.usb_set_configuration(usb_dev_handle, configuration) < 0) {
-			throw new USBException("LibusbWin.usb_set_configuration: "
-					+ LibusbWin.usb_strerror());
-		}
-		if (LibusbWin.usb_claim_interface(usb_dev_handle, interface_) < 0) {
-			throw new USBException("LibusbWin.usb_claim_interface: "
-					+ LibusbWin.usb_strerror());
-		}
-		if (LibusbWin.usb_set_altinterface(usb_dev_handle, altinterface) < 0) {
-			throw new USBException("LibusbWin.usb_set_altinterface: "
-					+ LibusbWin.usb_strerror());
-		}
-		logger.info("interface claimed");
-	}
-
-	/**
-	 * Release a previously claimed interface.
-	 * 
-	 * @param dev_handle
-	 *            the handle of the device <b>(MUST BE VALID)</b>
-	 * @param interface_
-	 *            the interface to claim
-	 * @throws USBException
-	 *             throws an USBException if the action fails
-	 */
-	static void release_interface(int dev_handle, int interface_)
-			throws USBException {
-		if (LibusbWin.usb_release_interface(dev_handle, interface_) < 0) {
-			throw new USBException("LibusbWin.usb_release_interface: "
-					+ LibusbWin.usb_strerror());
-		}
-		logger.info("interface released");
-	}
 }
diff --git a/mcdp/src/ch/ntb/usb/Usb_Config_Descriptor.java b/mcdp/src/ch/ntb/usb/Usb_Config_Descriptor.java
index ebe75ca..023fe11 100644
--- a/mcdp/src/ch/ntb/usb/Usb_Config_Descriptor.java
+++ b/mcdp/src/ch/ntb/usb/Usb_Config_Descriptor.java
@@ -17,9 +17,10 @@ public class Usb_Config_Descriptor {
 
 	public byte MaxPower;
 
-	public Usb_Interface []interface_;
+	public Usb_Interface[] interface_;
 
-	// TODO: Extra descriptors are not interpreted because of their unknown structure
+	// TODO: Extra descriptors are not interpreted because of their unknown
+	// structure
 	public Usb_Config_Descriptor extra; /* Extra descriptors */
 
 	public int extralen;
@@ -32,8 +33,9 @@ public class Usb_Config_Descriptor {
 		sb.append("\tbNumInterfaces: " + bNumInterfaces + "\n");
 		sb.append("\tbConfigurationValue: " + bConfigurationValue + "\n");
 		sb.append("\tiConfiguration: " + iConfiguration + "\n");
-		sb.append("\tbmAttributes: " + bmAttributes + "\n");
-		sb.append("\tMaxPower: " + MaxPower + "\n");
+		sb.append("\tbmAttributes: 0x"
+				+ Integer.toHexString(bmAttributes & 0xFF) + "\n");
+		sb.append("\tMaxPower [mA]: " + MaxPower + "\n");
 		return sb.toString();
 	}
 
diff --git a/mcdp/src/ch/ntb/usb/Usb_Device_Descriptor.java b/mcdp/src/ch/ntb/usb/Usb_Device_Descriptor.java
index 45b81b4..b3881b9 100644
--- a/mcdp/src/ch/ntb/usb/Usb_Device_Descriptor.java
+++ b/mcdp/src/ch/ntb/usb/Usb_Device_Descriptor.java
@@ -28,19 +28,21 @@ public class Usb_Device_Descriptor {
 	public byte iSerialNumber;
 
 	public byte bNumConfigurations;
-	
+
 	public String toString() {
 		StringBuffer sb = new StringBuffer();
 		sb.append("** Usb_Device_Descriptor **\n");
 		sb.append("\tblenght: " + bLength + "\n");
 		sb.append("\tbDescriptorType: " + bDescriptorType + "\n");
-		sb.append("\tbcdUSB: " + bcdUSB + "\n");
+		sb.append("\tbcdUSB: 0x" + Integer.toHexString(bcdUSB) + "\n");
 		sb.append("\tbDeviceClass: " + bDeviceClass + "\n");
 		sb.append("\tbDeviceSubClass: " + bDeviceSubClass + "\n");
 		sb.append("\tbDeviceProtocol: " + bDeviceProtocol + "\n");
 		sb.append("\tbMaxPacketSize0: " + bMaxPacketSize0 + "\n");
-		sb.append("\tidVendor: " + idVendor + "\n");
-		sb.append("\tidProduct: " + idProduct + "\n");
+		sb.append("\tidVendor: 0x" + Integer.toHexString(idVendor & 0xFFFF)
+				+ "\n");
+		sb.append("\tidProduct: 0x" + Integer.toHexString(idProduct & 0xFFFF)
+				+ "\n");
 		sb.append("\tbcdDevice: " + bcdDevice + "\n");
 		sb.append("\tiManufacturer: " + iManufacturer + "\n");
 		sb.append("\tiProduct: " + iProduct + "\n");
diff --git a/mcdp/src/ch/ntb/usb/Usb_Endpoint_Descriptor.java b/mcdp/src/ch/ntb/usb/Usb_Endpoint_Descriptor.java
index 2ab7306..f6d3586 100644
--- a/mcdp/src/ch/ntb/usb/Usb_Endpoint_Descriptor.java
+++ b/mcdp/src/ch/ntb/usb/Usb_Endpoint_Descriptor.java
@@ -17,18 +17,21 @@ public class Usb_Endpoint_Descriptor {
 
 	public byte bSynchAddress;
 
-	// TODO: Extra descriptors are not interpreted because of their unknown structure
+	// TODO: Extra descriptors are not interpreted because of their unknown
+	// structure
 	public Usb_Endpoint_Descriptor extra; /* Extra descriptors */
 
 	public int extralen;
-	
+
 	public String toString() {
 		StringBuffer sb = new StringBuffer();
 		sb.append("**Usb_Endpoint_Descriptor**\n");
 		sb.append("\tblenght: " + bLength + "\n");
 		sb.append("\tbDescriptorType: " + bDescriptorType + "\n");
-		sb.append("\tbEndpointAddress: " + bEndpointAddress + "\n");
-		sb.append("\tbmAttributes: " + bmAttributes + "\n");
+		sb.append("\tbEndpointAddress: 0x"
+				+ Integer.toHexString(bEndpointAddress & 0xFF) + "\n");
+		sb.append("\tbmAttributes: 0x"
+				+ Integer.toHexString(bmAttributes & 0xFF) + "\n");
 		sb.append("\twMaxPacketSize: " + wMaxPacketSize + "\n");
 		sb.append("\tbInterval: " + bInterval + "\n");
 		sb.append("\tbRefresh: " + bRefresh + "\n");
diff --git a/mcdp/src/ch/ntb/usb/Usb_Interface_Descriptor.java b/mcdp/src/ch/ntb/usb/Usb_Interface_Descriptor.java
index 354fcd6..205c632 100644
--- a/mcdp/src/ch/ntb/usb/Usb_Interface_Descriptor.java
+++ b/mcdp/src/ch/ntb/usb/Usb_Interface_Descriptor.java
@@ -21,7 +21,8 @@ public class Usb_Interface_Descriptor {
 
 	public Usb_Endpoint_Descriptor[] endpoint;
 
-	// TODO: Extra descriptors are not interpreted because of their unknown structure
+	// TODO: Extra descriptors are not interpreted because of their unknown
+	// structure
 	public Usb_Interface_Descriptor extra; /* Extra descriptors */
 
 	public int extralen;
@@ -34,9 +35,12 @@ public class Usb_Interface_Descriptor {
 		sb.append("\tbInterfaceNumber: " + bInterfaceNumber + "\n");
 		sb.append("\tbAlternateSetting: " + bAlternateSetting + "\n");
 		sb.append("\tbNumEndpoints: " + bNumEndpoints + "\n");
-		sb.append("\tbInterfaceClass: " + bInterfaceClass + "\n");
-		sb.append("\tbInterfaceSubClass: " + bInterfaceSubClass + "\n");
-		sb.append("\tbInterfaceProtocol: " + bInterfaceProtocol + "\n");
+		sb.append("\tbInterfaceClass: 0x"
+				+ Integer.toHexString(bInterfaceClass & 0xFF) + "\n");
+		sb.append("\tbInterfaceSubClass: 0x"
+				+ Integer.toHexString(bInterfaceSubClass & 0xFF) + "\n");
+		sb.append("\tbInterfaceProtocol: 0x"
+				+ Integer.toHexString(bInterfaceProtocol & 0xFF) + "\n");
 		sb.append("\tiInterface: " + iInterface + "\n");
 		return sb.toString();
 	}
diff --git a/mcdp/src/ch/ntb/usb/test/TestImplementation.java b/mcdp/src/ch/ntb/usb/test/TestImplementation.java
index f4e4400..ee8148d 100644
--- a/mcdp/src/ch/ntb/usb/test/TestImplementation.java
+++ b/mcdp/src/ch/ntb/usb/test/TestImplementation.java
@@ -82,11 +82,11 @@ public class TestImplementation {
 	}
 
 	static void read() {
-		byte[] data = new byte[USB.MAX_DATA_SIZE];
+		byte[] data = new byte[dev.getMaxPacketSize()];
 		int lenRead = 0;
 		try {
-			lenRead = dev.bulkread(IN_ENDPOINT, data,
-					USB.MAX_DATA_SIZE, TIMEOUT);
+			lenRead = dev.bulkread(IN_ENDPOINT, data, dev.getMaxPacketSize(),
+					TIMEOUT);
 			StringBuffer sb = new StringBuffer("read_bulkdata: " + lenRead
 					+ " Bytes received: Data: ");
 			for (int i = 0; i < lenRead; i++) {