Extron electronic 300 manuale d’uso

User Guide VN-Matrix 300 Matrix Systems 68-1995-01 Rev. A 12 10[...]

ii This symbol is intended to alert the user of important operating and mainte- nance (servicing) instructions in the literature provided with the equipment. This symbol is intended to alert the user of the presence of uninsulated dangerous voltage within the product’ s enclosure that may present a risk of electric shock. Caution Read Instruction[...]

iii Notational Conventions Used in this Guide TIP: A tip provides a suggestion to make setting up or working with the device easier . NOTE: A note draws attention to important information. CAUTION: A caution warns of things or actions that might damage the equipment. WARNING: A warning war ns of things or actions that might cause injury , death, or[...]

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VN-Matrix 300 • Contents v Contents Introduction ......................................................... 1 About the VN-Matrix 300 ..................................... 1 Functional Overview ............................................. 1 Signal Compatibility — Video ............................ 2 Signal Compatibility — Audio ..............[...]

VN-Matrix 300 • Contents vi Device Page — Peripherals ................................. 49 Serial Port Control ............................................ 49 Pass-through Control Mode ............................ 49 Configuring a Serial Pass-through Group ....... 50 Firmware, Licensing Upgrades and User Accounts ..............................[...]

VN-Matrix 300 • Introduction 1 Intr oduction This section describes: z About the VN-Matrix 300 z Functional Overview z Setup and Configuration z System Control z Front Panel Featur es z Rear Panel Features About the VN-Matrix 300 The Extron ® range of VN-Matrix™ 300 video encoders/decoders (VNC 300 codecs) distribute digital SD and HDTV broad[...]

VN-Matrix 300 • Introduction 2 Signal Compatibility — Video The VN-Matrix 300 is supplied in one of three options, based on the type of digital video transport and video resolutions that it is intended to support. Digital Video T ransport Model Number SMPTE424/425M SMPT292 SMPTE 259M VN-Matrix 300 SD Not supported Not supported 525i/59.94 Hz; 6[...]

VN-Matrix 300 • Introduction 3 System Contr ol Integrated Web Management System The VN-Matrix 300 incorporates an integrated web management system (referr ed to in this manual as the web interface). This allows any VN-Matrix 300 unit on a network to be congured via a Windows ® -based PC (on the same network), using a standard web br owser (su[...]

VN-Matrix 300 • Introduction 4 VN-Matrix 300 System Overview In this example either of the two encoder streams may be r outed to any of the three decoder units. The VN-Matrix 300 labelled IP Rx is the controller for the system. Netw ork VN-MATRIX 300 SERIES SERIAL DIGI TA L VIDEO OVER IP LAN-1 LAN-2 ST AT US ALARM TEST VN-MATRIX 300 SERIES SERIAL[...]

VN-Matrix 300 • Introduction 5 Multicast RTP This transport method uses a real-time variation of UDP (User Datagram Pr otocol), called RTP (Real T ime Protocol). Multicast RTP allows a sour ce to be displayed on any number of displays. Netw ork VN-MATRIX 300 SERIES SERIAL DIGI TA L VIDEO OVER IP LAN-1 LAN-2 ST AT US ALARM TEST VN-MATRIX 300 SERIE[...]

VN-Matrix 300 • Introduction 6 Unicast RTP Like Multicast RTP , this method uses a r eal-time variation of UDP protocol, called RTP . This method can be used where the network infrastructur e does not support multicast traffic. T ypically this should be used as a point-to-point configuration (that is: single sour ce to single display) but it ca[...]

VN-Matrix 300 • Introduction 7 Unicast TCP This method transports data using standard TCP (T ransport Contr ol Protocol) and should only ever be used for single point-to-point transfer of data. Netw ork VN-MATRIX 300 SERIES SERIAL DIGI TA L VIDEO OVER IP LAN-1 LAN-2 ST AT US ALARM TEST VN-MATRIX 300 SERIES SERIAL DIGI TA L VIDEO OVER IP LAN-1 LAN[...]

VN-Matrix 300 • Introduction 8 Fr ont Panel Features Figure 5. VN-Matrix 300 Front Panel Indicators The following indicators are visible on the fr ont of the VN-Matrix 300: Name Color Function Power Green z Fully Lit – when the unit is receiving power fr om the 12V supply input. z Flashing – an over temperature condition has occurred or there[...]

VN-Matrix 300 • Introduction 9 T est Button The test button on the front panel pr ovides the following functionality . Encoder Decoder Action Display the test pattern on the SDI-OUT connector . Display the test pattern on the SDI-OUT connector Active stream Suspended Not displayed Output format HD 1280 x 720, pr ogressive SD 720 x 576 / 720 x 480[...]

VN-Matrix 300 • Introduction 10 Digital Video Connectors The VN-Matrix 300 provides 3 BNC connectors for the connection of digital video sour ces. The function of the connectors may change dependant on the configuration of the unit (encoder or decoder mode). Connector Mode SDI – IN SDI - OUT SDI - LOOP Encoder (IP TX) Digital Video input This [...]

VN-Matrix 300 • Installation and Basic Setup Procedur es 11 Installation and Basic Setup Pr ocedur es This section describes basic installation and setup procedur es, including: z Choosing a Suitable Location z Environmental Requir ements z Rack Mount Requirements z Mains Power Connection z Mains Power Cord z Accessories z Setup Procedur e z Netw[...]

VN-Matrix 300 • Installation and Basic Setup Procedur es 12 T emperature DO NOT install or operate the VN-Matrix 300 in an area wher e the ambient temperature exceeds 35°C (95°F) or falls below 5°C (35°F). Remember that, as with all electronic equipment, the VN-Matrix 300 and its associated PSU also produces heat which may af fect the ambient[...]

VN-Matrix 300 • Installation and Basic Setup Procedur es 13 Mains Power Connection (via PSU) The VN-Matrix 300 must be powered fr om a 12 V olt DC regulated supply . A suitable mains-operated power supply unit (PSU) is provided. The mains connection details that follow relate to the PSU. CAUTION: Never connect the VN-Matrix 300 directly to the ma[...]

VN-Matrix 300 • Installation and Basic Setup Procedur es 14 Fitting a Mains Plug If you are fitting a plug to the unterminated power cor d (or replacing an existing plug), you must fit a plug that: z Is rated for use with mains voltage z Is equipped with a grounding pin/connection z Complies with any applicable National or Local electrical regu[...]

VN-Matrix 300 • Installation and Basic Setup Procedur es 15 Unfused Plugs or Hard-wir ed If the power cord is fitted with an unfused plug, or is har d-wired into a power strip (mains distribution batten), then the power cord must be pr otected by an external fuse or circuit breaker of a rating shown in the table below: Supply V oltage 110V nomin[...]

VN-Matrix 300 • Installation and Basic Setup Procedur es 16 Rack Mounting Figure 9. VNM Quad RMK – 2U High for 4 VN-Matrix 300 Units Figure 10. VNM Dual RMK – 1U High for 2 VN-Matrix 300 Units Full details of the VNM Dual RMK and VNM Quad RMK rack trays are available on r equest from your Extr on dealer . Redundant PSU A 12 way redundant powe[...]

VN-Matrix 300 • Installation and Basic Setup Procedur es 17 Basic Setup Pr ocedure Configuring a VN-Matrix 300 System Setting up and connecting a VN-Matrix 300 system is best undertaken in three stages. z Stage 1: Network Communications Setup Configure the network settings for each device using a PC and serial data link, ensuring that one devic[...]

VN-Matrix 300 • Installation and Basic Setup Procedur es 18 z On the PC run a terminal emulation program such as HyperT erminal, with the following comms settings: Baud rate: 115200 Data bits: 8 Parity: None Stop bits: 1 Flow control: None Low level configuration z Connect the power to the VN-Matrix 300 (or , if already connected, cycle the powe[...]

VN-Matrix 300 • Installation and Basic Setup Procedur es 19 Network Port Specific Options Option Function Comment 0 and 10 Network port link speed z Option 0 allows the speed of the RJ45 network port to be set manually . z Option 10 reports the speed of the SFP port; this is xed at 1Gbs 1 and 11 Set ST A TIC or DHCP Entering 1 (11) will toggl[...]

VN-Matrix 300 • Installation and Basic Setup Procedur es 20 Network Port Specific Options Option Function Comment Unit Specific Options 8 Set the number of the port that is used for communications with the system controller . By default this is set to 5432, this may be changed if requir ed. Note that all VN-Matrix 300 units MUST have the same p[...]

VN-Matrix 300 • Installation and Basic Setup Procedur es 21 Video and Audio Data Video and audio data may be transported over either of the NICs on the VN-Matrix 300 unit and are independent of the system contr ol data. NOTE: The browser is accessible via either network port on the unit that is configur ed as the controller . Switched Network Co[...]

VN-Matrix 300 • Installation and Basic Setup Procedur es 22 Unit 2 Network Port 1 (RJ45) Network Port 2 (SFP) 0 Speed/Duplex:auto_10_100_1000 10 Speed/Duplex:Fiber_fixed_1000 1 Boot method: static [dhcp] 11 Boot method: static [dhcp] 2 Address: 172.28.0.2 12 Address: 192.168.0.2 3 Netmask: 255.255.0.0 13 Netmask: 255.255.255.0 4 Gateway: 14 Gatew[...]

VN-Matrix 300 • Installation and Basic Setup Procedur es 23 Unit 1 Network Port 1 (RJ45) Network Port 2 (SFP) 0 Speed/Duplex:auto_10_100_1000 10 Speed/Duplex:Fiber_fixed_1000 1 Boot method: static [dhcp] 11 Boot method: static [dhcp] 2 Address: 172.28.0.1 12 Address: 192.168.0.1 3 Netmask: 255.255.0.0 13 Netmask: 255.255.255.0 4 Gateway: 14 Gatew[...]

VN-Matrix 300 • Installation and Basic Setup Procedur es 24 Routed Network Configuration Example NOTES: This is an example of a routed network configuration. • Unit 1 is congur ed as the controller , on IP addr ess 192.168.0.1. The two VN-Matrix 300 units are connected across a W AN via an external router . • A gateway IP address is now [...]

VN-Matrix 300 • Installation and Basic Setup Procedur es 25 Unit 2 Network Port 1 (RJ45) Network Port 2 (SFP) 1 Boot method: static dhcp] 11 Boot method: static [dhcp] 2 Address: 172.29.1.1 12 Address: 192.168.1.1 3 Netmask: 255.255.0.0 13 Netmask: 255.255.255.0 14 Gateway: 192.168.1.250 5 Broadcast: 15 Broadcast: 6 Mtu: 1500 16 Mtu: 1500 17 Cont[...]

VN-Matrix 300 • System Conguration 26 System Configuration This section describes: z VN-Matrix 300 Web Interface z Start Up and Login Procedur e z Device List Page z Device Page z Configuration Page — Videoport (Encoder) z Bandwidth Management Page — Videoport (Encoder) z Configuration Page — Videoport (Decoder) z Device Page Peripher[...]

VN-Matrix 300 • System Conguration 27 Start Up and Login Pr ocedure The IP address of the contr oller is entered into the addr ess bar of the browser in the normal way . Figure 13. Entering the IP Addr ess In the example above, the IP address of the contr oller is 192.168.0.101. NOTE: The IP address of the contr oller in your system will be di[...]

VN-Matrix 300 • System Conguration 28 Device List Page The Device List page will display . This page lists all of the VN-Matrix 300 codecs and decoders that are pr esent on the network. Device T ype Three types of device may appear in the list z 3G-SDI — A codec that is licensed to operate at all resolutions up to and including the 3G-SDI st[...]

VN-Matrix 300 • System Conguration 29 Device Page Select a device from the device list: z Double click the mouse pointer on any of the entries for a device in the list (see figure 15 ). The Device page of the chosen unit will be displayed. The example below shows the Device page for an encoder . Figure 16. Device Page is Divided into Four Inf[...]

VN-Matrix 300 • System Conguration 30 Device Setup ( c ) The Device setup area allows a VN-Matrix 300 device to be congur ed as either an encoder or as a decoder . NOTE: The VN-Matrix 300 is available as a decoder (VND 300) only . In this case it is not possible to configure the unit as an encoder . Create Sour ce (Encoder) Select this opt[...]

VN-Matrix 300 • System Conguration 31 Create Display (Decoder) Select this option to create a Display ( Decoder). z Display will be shown adjacent to a change device type button. z A display icon will be created in the Configuration window . Figure 18. Source (Decoder) Configuration and Setup The Device Setup area pr ovides access the followi[...]

VN-Matrix 300 • System Conguration 32 Configuration Page — V ideoport (Encoder) The encoder Configure page provides: z Status information for the encoder z Access to the Bandwidth Management page z Stream statistics and multicast configuration Figure 19. Configuration Page Encoder Videoport Panel The top panel of the videoport (Encoder) C[...]

VN-Matrix 300 • System Conguration 33 Encoder Streams Panel The Streams panel of the Configure page for an encoder provides information on any active streams that ar e configured on the encoder . z Stream definition — Pr ovides information on any active streams fr om the Encoder . z Streams ar e provisioned at the display (decoder) device. [...]

VN-Matrix 300 • System Conguration 34 Bandwidth Management Page — V ideoport (Encoder) Click the Bandwidth tab on the Configure page. The Bandwidth (see figure 20) page opens. Figure 20. Bandwidth Page The Bandwidth page provides for the contr ol of the spatial and temporal compression settings for the encoded source. The available controls[...]

VN-Matrix 300 • System Conguration 35 Bandwidth Management — Standard Contr ol Figure 21. Standar d Contr ol Area The Standard control area pr ovides a user with a quick configuration method for the VN-Matrix 300 encoder . Statistics for any active streams curr ently running from the encoder ar e provided in the Streams information area. Co[...]

VN-Matrix 300 • System Conguration 36 Image Quality The Image Quality controls the spatial compr ession. A setting of 4 provides a visually lossless image. A higher setting results in higher compr ession whilst a lower setting applies a lower level of compression. Changes made to this setting will result in a corr esponding change in the bit r[...]

VN-Matrix 300 • System Conguration 37 Video Quality Management Spatial Compression settings Figure 23. Spatial Compr ession Settings The level of spatial compression is set using the Luminance and Chr ominance control. These controls ar e normally locked, with an optimal offset of 2 units between them. A Luminance value of 0 provides the minim[...]

VN-Matrix 300 • System Conguration 38 Bandwidth Management The Bandwidth management section provides a method to set a maximum bit rate for the encoded stream. It duplicates the Contr ol mode settings already described in the Standard Control area (alr eady described above) but includes two additional modes of control. Figure 24. Bandwidth Man[...]

VN-Matrix 300 • System Conguration 39 Configuration Page — Ancport (Encoder) The AncPort configuration is accessed from the icon in the device, configuration page and provides access to settings r elating to the Ancillary data that is present in the video transport connection. Primarily , this data relates to the embedded audio. Figure 26[...]

VN-Matrix 300 • System Conguration 40 ANC Panel Provides for contr ol and configuration of the ancillary data channels. Selecting the Audio group There ar e 16 audio channels present in the SDI/HDSDI/3G SDI video transport. These ar e arranged in 4 groups each of 4 channels. The VN-Matrix 300 units can transport 1 gr oup (4 audio channels). T[...]

VN-Matrix 300 • System Conguration 41 By using both FEC methods together , 2 dimensional FEC, the combined effect can pr otect against more loss permutations than either scheme used in isolation. FEC works by adding additional data to the stream. Using this data it is possible for the decoder to detect and reconstruct any lost packets. P1 P2 P[...]

VN-Matrix 300 • System Conguration 42 Streams Panel (ANC) The Streams panel of the Configure page for an encoder pr ovides information on any active streams (audio) that ar e configured on the encoder . z Stream definition — Pr ovides information on any active streams fr om the encoder . z Streams ar e provisioned at the display (decoder) d[...]

VN-Matrix 300 • System Conguration 43 The format of the FEC stream is set via the appr opriate icon (either colefec or rowfec) in the Configure dialog of the Device page. Figure 29. Device Page, Configuration Dialog z Multicast Enable — Allows the user to select the multicast option. If selected: z The user is prompted to enter a multicast [...]

VN-Matrix 300 • System Conguration 44 T ypical Application Bit Rates T ypical bit rates — V ideo Application z Broadcast Contribution z Camera Panning z Sports/Nature z Lifestyle z Broadcast News Media Gathering z Static Camera Frame z Interviews z Static Camera Frame z Surveillance z T elepresence z Collaboration z V ideo Phone Profile z H[...]

VN-Matrix 300 • System Conguration 45 T ypical Bit Rates (HD and 3G Sour ces) — Audio The total bit rate for each group is appr oximately 16 Mbs. 1 group (4 channels) 2 group (8 Channels) 3 group (12 channels) 4 group (16 Channels) Audio Bit rate 16 Mbs 32 Mbs 48 Mbs 64 Mbs FEC overhead (Example @ 40%) 6 Mbs 12 Mbs 18 Mbs 24 Mbs T otal audio[...]

VN-Matrix 300 • System Conguration 46 Decoder Videoport Panel The top panel of the videoport (decoder) configuration page provides access to the following features: z Name — This may be changed to a user specific value. This is the name that is displayed in the device list page. z Nodata splash — Enables the display of a splash screen wh[...]

VN-Matrix 300 • System Conguration 47 Stream T ype —_rtp MUL TICAST A multicast UDP stream, used for best ef fort point to multi point delivery . Note that this stream type is only available when a multicast str eam has been configured at the corresponding encoder . Decoder — Enabling audio streams T ransport of the audio content (the aud[...]

VN-Matrix 300 • System Conguration 48 Decoder — Bit Rate and Stream Statistics The bit rate and statistics for each of the stream types (video, audio and FEC) may be monitored. NOTE: The bit rate statistic reported her e applies to whichever stream type is being monitored. This is dif ferent to the bit rate statistics r eported by the encode[...]

VN-Matrix 300 • System Conguration 49 Bit rate and network statistics for the current str eam are r eported in a tabular form. z The total column contains counts for the history of the stream. z The window1 and window2 columns contain counts over user programmable intervals. z Megabits/sec — The bit rate received fr om the current data sour [...]

VN-Matrix 300 • System Conguration 50 Data input to the server is sent to all clients simultaneously . Data received at a client is sent to the server . Simultaneous data transfers are pr ocessed on a first in first out basis. Any number of pass-through gr oups may exist on the same network. Communication may only take place between a client[...]

VN-Matrix 300 • System Conguration 51 Client Mode From the Devicepage, Peripherals tab of each device in the client gr oup, configure the client devices. 1. On the Device page, click on the device you want to configure as a client. 2. Select the Peripherals tab. 3. Set the mode a to client. This reveals the destination listbox. 4. In the des[...]

VN-Matrix 300 • Firmware, License Upgrades, and User Accounts 52 Firmwar e, Licensing Upgrades and User Accounts This section describes upgrading device firmware and clock management . Upgrading Device Firmwar e From time to time Extr on may issue rmware upgrades for VN-Matrix 300 in or der to make new functionality available. Details of the [...]

VN-Matrix 300 • Firmware, License Upgrades, and User Accounts 53 NOTES: z Performing the Activate function on the controller will cause the device to reboot and as a r esult the upgrade file (in the temporary storage are) will be erased. It is recommended, ther efore, that you PREP ARE all devices first, after which the upgrade file will no lo[...]

VN-Matrix 300 • Firmware, License Upgrades, and User Accounts 54 Device Upgrade status messages Device Upgrade Status Description Action W ait This is the normal state when the unit is running with the current version of firmware. z Browse to and load a new version of firmware. The new file is held in the controller . z Select the firmware ve[...]

VN-Matrix 300 • Firmware, License Upgrades, and User Accounts 55 2. Click the Upload button to begin uploading the le to the VN-Matrix 300 controller . This may take a few minutes. Once the file is uploaded, you can begin installing it into each unit , starting with the controller unit. 1. From the Device List page, click on the VN-Matrix 300[...]

VN-Matrix 300 • Firmware, License Upgrades, and User Accounts 56 Licensing Each VN-Matrix 300 unit is supplied with a feature set that is dened by a license key and a structure. This is not intended to be changed as part of normal operation and this section is provided for information only . Figure 41. License Page License structure The licens[...]

VN-Matrix 300 • Firmware, License Upgrades, and User Accounts 57 User Accounts Changing User Login Passwords From the Device List page click the Accounts tab. Figure 42. Accounts Page The VN-Matrix 300 has three user accounts: z Administrator — which allows full read/write access to all setup parameters, z Public Account — which allows read o[...]

VN-Matrix 300 • Firmware, License Upgrades, and User Accounts 58 Clock Management Figure 43. Accounts Page The system clock is generated by the unit that is acting as the controller . All units in the system receive their time stamps fr om the system controller . The clock for all VN Matrix 300 series units is set in production and may be changed[...]

VN-Matrix 300 • Alarms and SNMP 59 Alarms and SNMP This section provide the following: z Overview — Alarms z Alarms Page z Overview — SNMP z SNMP T rap Destinations Overview — Alarms The VN-Matrix 300 is congured to generate alarms for range of err or conditions. A list of these error conditions and their meanings ar e presented on the f[...]

VN-Matrix 300 • Alarms and SNMP 60 Alarms Page Figure 45. The Alarms scr een enables a user to define and monitor system alarms. Filter Settings Figure 46. Filter Settings Section The Filter Settings section allows the default settings for each alarm type to be modified. a Alarm T ype — Select the particular alarm that is to have its default [...]

VN-Matrix 300 • Alarms and SNMP 61 Alarm T ype This drop down lists the available alarm err or conditions for all units. Alarm error conditions are divided into two br oad categories z Alarm errors that occur on an Encoder z Alarm errors that occur on a Decoder In addition there is one alarm err or that only occurs on the device that is configur[...]

VN-Matrix 300 • Alarms and SNMP 62 Alarm Logs A historical list of the last 200 alarm events is provided in the Alarm Logs page. Figure 48. Alarm Log Page Showing Err or Conditions The log provides data on when an alarm err or condition was raised and cleared. Each event is paired in the log so a raise and clear event is listed together . The log[...]

VN-Matrix 300 • Alarms and SNMP 63 Alarm T ype Description — Encoder Alarm T ype Description Action Default Settings Encoder Alarm No source No source pr esent at the input. Check input connections; is there an output on the loop through connector? Critical, reporting Bad source syncs Source is present, unr ecognized due to bad sync measurement[...]

VN-Matrix 300 • Alarms and SNMP 64 Alarm T ype Description — Decoder Alarm T ype Description Action Default Settings Decoder Alarm No decoder video data Indicates that there is a valid connection, no video data present. Usually accompanied by no source data stream message in the WEB interface. W arning, reporting No decoder mode No matching dec[...]

VN-Matrix 300 • Alarms and SNMP 65 Overview — SNMP The VN-Matrix 300 system has the ability to report alarm events via an SNMP trap, pr oviding simple integration with Network management systems (NMS). When communicating using SNMP the VN-Matrix 300 complies with the requir ements of SNMP v3. When generating SNMP traps the VN-Matrix 300 complie[...]

VN-Matrix 300 • T echnical Data 66 Refer ence Information This sections covers specifications and hardwar e information. Specifications Video Signal type ..................................... SDI, HD-SDI, 3G-SDI digital video Resolution ...................................... 8 or 10 bits, automatic Data rates ...................................[...]

VN-Matrix 300 • T echnical Data 67 Output impedance ......................... 75 ohms V ertical frequency ........................... 23.97 Hz to 60 Hz, depending on signal format Audio input and output Number/signal type ........................ 4 groups of 4 channels, embedded with video signal Source formats ............................... SMP[...]

VN-Matrix 300 • T echnical Data 68 Regulatory compliance Safety ...................................... CE, UL EMI/EMC ................................. CE, EN60950-1 W arranty ........................................ 3 years parts and labor NOTE: All nominal levels are at ±10%. NOTE: Specifications are subject to change without notice. Har dwar[...]

VN-Matrix 300 • T echnical Data 69 Network Port 2: SFP Function: Port 2 is used for network connectivity and supports 10/100/1000BASE-LX (Gigabit Ethernet) optical and 10/100/1000BASE-TX (Gigabit Ethernet) copper connections. Connector type: SFP (mini-GBIC) GIGABIT slot for copper or Optical SFP compatible transceivers. Optical SFP compatible tra[...]

VN-Matrix 300 • T echnical Data 70 RS-232 Serial I/O (COM1 and COM2) Function: COM1 – used for low level setup or system recovery . COM2 – used for cross-network serial communications and alarm relay . Connector type: 9-pin D-type (male) Pin-out details: View into chassis plug Connector Shell = Screen COM 1 connector pin out Pin Function Pin [...]

Extr on ® W arranty Extron Electr onics warrants this product against defects in materials and workmanship for a period of thr ee years from the date of pur chase. In the event of malfunction during the warranty period attributable directly to faulty workmanship and/or materials, Extron Electr onics will, at its option, repair or r eplace said pro[...]