background image

VAPIM-31 Specifications

APIM and VAPIM Specifications

B-7

B.6

VAPIM-31 SPECIFICATIONS

Figure B-7

VAPIM-31

Physical Interface:

OC12

Media Type:

Multimode Fiber

Data Rate:

622 Mbps

Connector Type:

SC

Transmit Power:

 -14 db to -22.5 db

Receive Sensitivity:

 -14 db to -26 db

Loss Budget:

 -12 db to -14 db

Wavelength:

 1270 nm to 1380 nm

Typical Link Distance:

500 meters

2825_33

APIM-31

STS
LNK

Содержание VHSIM2-A6DP

Страница 1: ...VHSIM2 A6DP User s Guide VHSIM2 A6DP APIM 1 APIM 2 APIM 21R STS LNK APIM 21R STS LNK 9032825 02...

Страница 2: ......

Страница 3: ...YS NETWORKS AND ITS LICENSORS HAVE BEEN ADVISED OF KNOWN OR SHOULD HAVE KNOWN THE POSSIBILITY OF SUCH DAMAGES Enterasys Networks Inc 35 Industrial Way Rochester NH 03866 5005 Enterasys Networks Inc is...

Страница 4: ...case the user will be required to correct the interference at his own expense WARNING Changes or modifications made to this device which are not expressly approved by the party responsible for complia...

Страница 5: ...mmerce which prohibit export or diversion of certain technical products to certain countries unless a license to export the product is obtained from the U S Government or an exception from obtaining s...

Страница 6: ...cumentation and media ENTERASYS DISCLAIMS ALL WARRANTIES OTHER THAN THOSE SUPPLIED TO YOU BY ENTERASYS IN WRITING EITHER EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTA...

Страница 7: ...ctrotechnical Standardization When operating within their performance limitations laser transceiver output meets the Class 1 accessible emission limit of all three standards Class 1 levels of laser ra...

Страница 8: ...60950 EN 60825 Equipment Type Environment Networking Equipment for use in a Commercial or Light Industrial Environment We the undersigned hereby declare under our sole responsibility that the equipmen...

Страница 9: ...Unpacking the VHSIM2 A6DP 2 1 2 2 Installing APIMs 2 2 2 3 Installing VAPIMs 2 5 2 4 Installing a VHSIM 2 8 2 4 1 Installing a VHSIM2 A6DP in an Interface Module 2 8 2 4 2 Installing a VHSIM2 A6DP in...

Страница 10: ...tion Screen 3 30 3 10 1 Setting the Redundancy Status 3 33 3 10 2 Setting the Primary Port 3 33 3 10 3 Setting the Active Port 3 34 3 10 4 Setting the Activation of Redundant Port Field 3 34 3 10 5 Se...

Страница 11: ...ofile 3 63 3 18 3 Deleting a Descriptor Profile 3 63 3 19 Discovery ELAN Setup Screen 3 64 3 19 1 Assigning the VHSIM2 A6DP to a Discovery ELAN 3 66 4 LANVIEW LEDS 4 1 VHSIM2 A6DP LEDs 4 1 A VHSIM2 A6...

Страница 12: ...n 3 20 3 8 Add Delete Entry Screen 3 21 3 9 ATM Connection Setup By Virtual Interface Screen 3 24 3 10 Physical Port Configuration Menu Screen 3 27 3 11 Port Framer Configuration Screen 3 28 3 12 ATM...

Страница 13: ...Figures xi B 7 VAPIM 31 B 7 B 8 VAPIM 39 B 8 B 9 VAPIM 39LR B 9...

Страница 14: ...xii Tables Tables Table Page 3 1 Event Messages 3 4 3 2 Keyboard Conventions 3 5 4 1 VHSIM2 A6DP LEDs 4 2 4 2 APIM LEDs 4 2...

Страница 15: ...iliar with installing networking systems and have a working knowledge of ATM networks and LAN Emulation and for system managers and others who perform network management tasks STRUCTURE OF THIS GUIDE...

Страница 16: ...to supplement the procedures and other technical data provided in this manual ATM Technology Guide Cabling Guide The manuals referenced above can be obtained on the World Wide Web in Adobe Acrobat Por...

Страница 17: ...er should highlight or input on a screen Bold type is also used for emphasis and cross references to other sections and titles of this manual RETURN Indicates either the ENTER or RETURN key depending...

Страница 18: ...indicates any combination of three alphabetic characters n A lowercase italic n indicates the generic use of a number e g 19nn indicates a four digit number in which the last two digits are unknown I...

Страница 19: ...switched ATM network Enterasys Networks provides a variety of APIMs that allow the user to select the type of configuration that best meets the network requirements If port redundancy is not a require...

Страница 20: ...ide 155 Mbps of bandwidth while the APIM installed in slot 2 could support Coaxial cable and provide 45 Mbps of bandwidth Appendix B details all of the APIMs and VAPIMs available for the VHSIM2 A6DP 1...

Страница 21: ...asys Networks products in the network A description of your network environment layout cable type etc Network load and frame size at the time of trouble if known The device history i e have you return...

Страница 22: ......

Страница 23: ...A6DP 2 Carefully remove the module from the shipping box Leave the module in its non conductive bag until you are ready to install the module 3 Attach the antistatic wrist strap refer to the instructi...

Страница 24: ...he antistatic wrist strap package 2 Remove and save the faceplate screws attaching the faceplate to the VHSIM2 A6DP See Figure 2 1 Remove the VHSIM2 A6DP faceplate 3 Remove and save the three screws f...

Страница 25: ...Installing APIMs Installation 2 3 Figure 2 1 Removing the APIM Coverplate APIM Coverplate 2825_02 VHSIM2 A6DP APIM 1 APIM 2 Faceplate Screws Standoff Screws...

Страница 26: ...igure 2 2 Figure 2 2 Installing an APIM CAUTION Ensure that the APIM connector aligns with the VHSIM2 A6DP connector pins to prevent bending the pins This can damage both the VHSIM2 A6DP and the modul...

Страница 27: ...ional and is not necessary for proper installation Refer to Figure 2 2 7 Reattach the faceplate to the VHSIM2 A6DP using the three screws saved in step 2 2 3 INSTALLING VAPIMs To install a VAPIM into...

Страница 28: ...Installing VAPIMs 2 6 Installation Figure 2 3 Removing the APIM Coverplate APIM Coverplate 2825_02 VHSIM2 A6DP APIM 1 APIM 2 Faceplate Screws Standoff Screws...

Страница 29: ...igure 2 4 Figure 2 4 Installing a VAPIM CAUTION Ensure that the VAPIM connectors align with the VHSIM2 A6DP connectors to prevent bending the pins This can damage both the VHSIM2 A6DP and the module V...

Страница 30: ...supported The following subsections provide generic instructions for installing an VHSIM2 A6DP in a module or in a standalone device 2 4 1 Installing a VHSIM2 A6DP in an Interface Module To install an...

Страница 31: ...Installing a VHSIM Installation 2 9 Figure 2 5 Removing the VHSIM Coverplate 2825_06 Host Device VHSIM2 Coverplate Standoff Screws Faceplate Mounting Screws...

Страница 32: ...e 2 6 Installing the VHSIM2 A6DP 7 Align the connectors of the VHSIM2 A6DP into the host device connector pins on the module as shown in Figure 2 6 VHSIM2 A6DP APIM 1 APIM 2 2825_06 Host Device Facepl...

Страница 33: ...to which these cables attach 3 Attach the antistatic wrist strap refer to the instructions outlined on the antistatic wrist strap package 4 Remove the device chassis cover refer to your specific devi...

Страница 34: ...eplate using the screws saved in step 5 11 Secure the VHSIM2 A6DP to the standoffs using the screws saved in step 6 12 Reattach the chassis cover to the device reconnect the power cord and reconnect t...

Страница 35: ...l Channels SVCs and optional LAN Emulation Services using Local Management Enable and configure LANE Services allowing the VHSIM2 A6DP to perform as a LAN Emulation Configuration Server LECS LAN Emula...

Страница 36: ...agement screens of the VHSIM2 A6DP 3 1 1 Local Management Screen Elements There are five types of screens used in Local Management password menu configuration status and warning screens Each type of s...

Страница 37: ...e XXXXX XX Slot Number X Flash Image Revision XX XX XX BOOTPROM Revision XX XX XX RETURN SAVE EXIT XXXXX XX LOCAL MANAGEMENT Redundancy Status Enabled Primary port 1 Active port 1 Activation of redund...

Страница 38: ...as being modifiable Selection Toggle Fields Selection Toggle fields provide a series of possible values Only applicable values appear in a selection field In the screens shown in this guide the selec...

Страница 39: ...m the same Local Management function For example Press ENTER means that you can press either ENTER or RETURN unless this manual specifically instructs you otherwise SPACE Bar and BACKSPACE Key These k...

Страница 40: ...g steps 1 Use the arrow keys to highlight a menu item 2 Press ENTER The selected Local Management screen displays CONNECTIONS PHYSICAL PORT CONFIGURATION LAN EMULATION CLIENTS SIGNALLING DISCOVERY ELA...

Страница 41: ...mmand 1 Use the arrow keys to highlight the RETURN command at the bottom of the Local Management screen 2 Press ENTER The previous screen in the Local Management hierarchy displays 3 Exit from VHSIM2...

Страница 42: ...n displays up to six menu items for configuration and monitoring of the VHSIM2 A6DP The following list explains each of the VHSIM2 A6DP ATM screen fields CONNECTIONS This menu item opens the ATM Conne...

Страница 43: ...es screen This screen is used to create a new traffic descriptor give it a name select a traffic category and designate the traffic rate for the new traffic descriptor For details refer to Section 3 1...

Страница 44: ...creen This screen is used to view all current ATM connections This screen also provides access to the Traffic Management PVC Priority Assignments and the Add Delete Entry screens which allow the user...

Страница 45: ...ress ENTER The ATM Connection Setup screen Figure 3 5 displays Figure 3 5 ATM Connection Setup Screen NOTE The first two connections shown in Figure 3 5 with VPI VCI values of 0 5 and 0 16 respectivel...

Страница 46: ...message Operational Status for the indicated connection s is down will appear at the bottom of the screen PORT Read Only Displays the application port on which the PVC or SVC resides Once a PVC is cre...

Страница 47: ...modify or delete PVCs If the device is in 802 1Q operational mode the Traffic Management PVC Priority Assignments screen will display when the ADD DELETE key is pressed To access this screen refer to...

Страница 48: ...e board is in 802 1Q SWITCHING MODE Each of the VPI VCI Traffic descriptor groups in the Virtual Port will be assigned to a specific virtual queue If the board is in SecureFast mode the user will be l...

Страница 49: ...layed As the number of virtual queues is increased or decreased it will cause the display in the table below to change accordingly The field is one based for the users ease of reference but the number...

Страница 50: ...le index number is displayed Traffic Category Read Only The traffic category corresponding to the selected profile index number is displayed SAVE Command Used to save a newly configured Virtual Port o...

Страница 51: ...number of queues displayed in the table below to change accordingly The field is one based for the users ease of reference but the number of queues displayed in the table and in the mib are zero base...

Страница 52: ...gured that has a traffic rate of zero an error message will be shown stating the index has a rate of zero and that the Virtual Port was not created 8 Use the arrow keys to highlight the SAVE command P...

Страница 53: ...procedure causes the whole Virtual Port to first be deleted and then re created to the specifications entered on the screen 3 5 3 Deleting an Entry Vport To delete an entry Vport perform the following...

Страница 54: ...ll traverse between the two boards on the PVC 0 50 If the client server traffic had been configured on each board to have a priority of 6 associated with it then all traffic between the client and ser...

Страница 55: ...ins each Add Delete Entry screen field VPI Modifiable Used to enter the Virtual Path Identifier of the PVC The available range for this field is 0 or 1 with a default value of 0 VCI Modifiable Used to...

Страница 56: ...resources the current APIM has available for the assignment of PVCs and their associated traffic descriptors If there are no PVCs configured the maximum bandwidth the active APIM supports is displaye...

Страница 57: ...d and enter the VCI value of the existing PVC to be modified 3 Use the arrow keys to highlight the Encapsulation Type field and press the SPACE bar until the appropriate Encapsulation Type displays 4...

Страница 58: ...S BY VIRTUAL INTERFACE menu item on the ATM Connections screen 2 Press ENTER The ATM Connection Setup By Virtual Interface screen Figure 3 9 displays Figure 3 9 ATM Connection Setup By Virtual Interfa...

Страница 59: ...n is activated by Local Remote Management Section 3 13 provides instructions on creating LECs using Local Management VPI Read only Displays the VPI of each connection that this interface is currently...

Страница 60: ...nformation than will fit on the screen 3 7 1 Selecting a Virtual Interface To specify which virtual interface to jump to proceed as follows 1 Use the arrow keys to highlight the Virtual Interface fiel...

Страница 61: ...n Menu screen Figure 3 10 displays Figure 3 10 Physical Port Configuration Menu Screen The following list explains each of the Physical Port Configuration Menu screen fields PORT FRAMER CONFIGURATION...

Страница 62: ...llowing steps 1 Use the arrow keys to highlight the PORT FRAMER CONFIGURATION menu item from the Physical Port Configuration Menu screen 2 Press ENTER The Port Framer Configuration screen Figure 3 11...

Страница 63: ...connectors to attach the physical cabling For details on the available APIMs refer to Appendix B Statistics Toggle This field toggles between OFF and ON The default setting for this field is OFF Alarm...

Страница 64: ...SAVE command at the bottom of the screen 9 Press ENTER The changes are saved to memory 3 10 ATM PORT REDUNDANCY CONFIGURATION SCREEN The ATM Port Redundancy Configuration screen allows the user to pe...

Страница 65: ...ains each ATM Port Redundancy Configuration screen field Redundancy Status Toggle Used to enable or disable the APIM redundancy feature of the VHSIM2 A6DP This field toggles between Enabled and Disabl...

Страница 66: ...Revert to Primary port Toggle Used to configure how the VHSIM2 A6DP will reactivate the primary port once any problems have been resolved This field toggles between Automatic and Manual The default s...

Страница 67: ...s perform the following steps 1 Use the arrow keys to highlight the Redundancy Status field 2 Press the SPACE bar to toggle between the choices until the appropriate mode displays Enabled or Disabled...

Страница 68: ...the SPACE bar to toggle between the choices until the appropriate mode displays Automatic or Manual 3 Use the arrow keys to highlight the SAVE command at the bottom of the screen and press ENTER The c...

Страница 69: ...0 00 1 00 A M perform the following steps 1 Use the arrow keys to highlight the Periodic test time field 2 Enter the time in this format HH MM SS 3 Press ENTER to set the test time entered in the Peri...

Страница 70: ...tory default values perform the following steps 1 Use the arrow keys to highlight the RESET TO FACTORY DEFAULTS command 2 Press ENTER All configurable options on this screen are reset to their default...

Страница 71: ...allows the user to view current information on multiple LAN Emulation components Refer to Section 3 14 LEC ARP CACHE This menu item opens the LEC ARP Cache screen This screen is used to view the ARP...

Страница 72: ...owing steps 1 Use the arrow keys to highlight the LEC TABLE menu item on the LAN Emulation Clients screen 2 Press ENTER The LEC Table screen Figure 3 14 displays Figure 3 14 LEC Table Screen The follo...

Страница 73: ...State Read Only Displays the current state of the LEC The LEC goes through a series of initialization phases which may result in this field displaying different states as the initialization process pr...

Страница 74: ...lticast Forward VCC with the BUS Once these VCCs have been created the LEC becomes operational on the network Operational The LEC is now fully configured and is switching traffic 3 13 LEC ADMINISTRATI...

Страница 75: ...cast Toggle This field toggles between Disable and Enable with a default value of Disable The Selective Multicast field is specific to LANE 2 0 and is not supported if LANE 1 0 is used LLC Multiplex C...

Страница 76: ...er or automatically by the VHSIM2 A6DP This field toggles between Automatic and Manual For instructions on how to configure the LEC automatically and manually refer to Section 3 13 2 and Section 3 13...

Страница 77: ...VHSIM2 A6DP LEC Index This command is only available if the screen is in MODIFY MODE MODIFY MODE Command Allows the modification of all LECs that have been previously configured by putting the LEC Ad...

Страница 78: ...new LEC Status becomes enabled 3 13 2 Configuring a New LEC Automatically To configure a new LEC automatically perform the following steps 1 Ensure the LEC Administration screen is in CREATE MODE If...

Страница 79: ...13 Use the arrow keys to highlight the LECS ATM Address field Enter the ATM Address of the LECS This step is optional and should be performed only when a specific LECS out of multiple servers is desir...

Страница 80: ...ield 12 Press the SPACE bar to toggle between the options Enable or Disable until the desired option displays 13 Use the arrow keys to highlight the Topology Change Frames field 14 Press the SPACE bar...

Страница 81: ...ons until the appropriate mode displays 8 If the LEC will be configured manually perform the following substeps a Use the arrow keys to highlight the ELAN Name field b Enter a name for the ELAN that i...

Страница 82: ...he modifications 3 13 5 Deleting an Existing LEC To delete an existing LEC perform the following steps 1 Use the arrow keys to highlight the LEC Index field 2 Enter the LEC Index of the LEC that will...

Страница 83: ...Server Actual ELAN Name Read Only Displays the name of the ELAN to which this LEC belongs RETURN 0x00 0000 00 000000 0000 0000 0000 000000000000 00 LEC Index 1 LEC ID 0 LEC STATE InitialState Status n...

Страница 84: ...ng refer to Section 3 17 ELAN ID Read Only Displays the ID that this ELAN was assigned by the LES LANE Version Read Only Displays the LANE version that the LEC is using This field will display 1 0 or...

Страница 85: ...the Multicast Send Virtual Channel Connection VCC that the LEC has with the BUS This connection is used by the LEC and the BUS to send all broadcast transmissions for address resolution This connectio...

Страница 86: ...ARP Cache Screen The following explains each of the LEC ARP Cache screen fields LEC Index Selectable Displays the Index of the LEC to which the information displayed on the screen pertains To select...

Страница 87: ...PI Read Only Displays the VPI being used by this LEC to contact the MAC ATM Address pair displayed in the appropriate row VCI Read Only Displays the VCI being used by this LEC to contact the MAC ATM A...

Страница 88: ...ch method displays 5 Use the arrow keys to move to the field that displays below the Search By field 6 Enter the search term Depending on the setting of the Search By field enter one of the following...

Страница 89: ...er may choose up to 8 virtual queues to be assigned to the Lec Index chosen in the previous field Elan Name Read Only Displays the name of the ELAN associated with the chosen LEC Index Virtual Queue R...

Страница 90: ...Lec Index field 2 Use the SPACE bar to toggle the field to display the desired Lec Index number or type in the desired Lec Index Number Press ENTER 3 Use the arrow keys to highlight the Number of Virt...

Страница 91: ...lains each of the Signalling screen fields ILMI Status Selectable Used to enable or disable the ILMI This field contains the following options Auto Configure Enabled Enabled and Disabled The default f...

Страница 92: ...ead Only This read only field displays the current UNI Q93b status If this field reads Disabled UNI did not start up correctly and some UNI services may not be available If this field remains in a dis...

Страница 93: ...I Status field 2 Press the SPACE bar until the option Disabled displays 3 Use the arrow keys to highlight the SAVE command located at the bottom of the screen and press ENTER The ILMI has been disable...

Страница 94: ...the ILMI To restart the ILMI perform the following steps 1 Use the arrow keys to highlight the RESTART ILMI command located on the bottom of the screen 2 Press ENTER The ILMI is restarted CAUTION Befo...

Страница 95: ...Profiles screen Figure 3 20 displays Figure 3 20 Traffic Management Descriptor Profiles Screen The following list explains each of the Traffic Management Descriptor Profiles screen fields Profile Ind...

Страница 96: ...f measurement for the profile Traffic Parameters Peak Cell Rate PCR Selectable Used to choose the peak cell rate for the profile Sustained Cell Rate SCR Selectable Used to choose the sustained cell ra...

Страница 97: ...Use the arrow keys to highlight the SAVE command Press ENTER to save the new descriptor profile 3 18 2 Modifying a Descriptor Profile A descriptor profile can be modified by performing the following s...

Страница 98: ...LANs and the VHSIM2 A6DP may belong to any number of these 16 ELANs The default ELAN is represented as Index 1 on the ATM Discovery ELAN Setup screen in Figure 3 21 After this default ELAN is created...

Страница 99: ...Slave When the VHSIM2 A6DP is configured to be in Master mode it will accept connections from all other VHSIM2 A6DPs in the Discovery ELANs it belongs to When the VHSIM2 A6DP is configured to be in S...

Страница 100: ...2 Enter the name of the ELAN to which the VHSIM2 A6DP will connect 3 Use the arrow keys to highlight the Mode field 4 Press the SPACE bar to toggle between the options until the desired mode displays...

Страница 101: ...r a description of VHSIM2 A6DP and APIM VAPIM LEDs Figure 4 1 VHSIM2 A6DP and APIM VAPIM LEDs NOTE The terms flashing blinking and solid used in the LED definition tables of this chapter indicate the...

Страница 102: ...ition LNK Link Green Solid Off Have link No link STS Status Green Solid APIM OK Red Solid Fault with media In most cases the APIM automatically corrects this condition without interrupting operations...

Страница 103: ...at any time without notice A 1 SPECIFICATIONS Environment Regulatory Compliance Operating Temperature 5 C to 40 C 41 F to 104 F Storage Temperature 30 C to 73 C 22 F to 164 F Operating Relative Humidi...

Страница 104: ......

Страница 105: ...PIMs and VAPIMs B 1 APIM 21 SPECIFICATIONS Figure B 1 APIM 21 Physical Interface OC3 Media Type Multimode Fiber Data Rate 155 Mbps Connector Type SC Transmit Power 14 db to 18 5 db Receive Sensitivity...

Страница 106: ...Figure B 2 APIM 29 Physical Interface OC3 Media Type Single Mode Fiber Data Rate 155 Mbps Connector Type SC Transmit Power 8 db to 14 db Receive Sensitivity 6 db to 32 5 db Loss Budget 8 db to 24 5 db...

Страница 107: ...ATIONS Figure B 3 APIM 29LR Physical Interface OC3 Media Type Single Mode Fiber Data Rate 155 Mbps Connector Type SC Transmit Power 0 db to 5 db Receive Sensitivity 31 db Loss Budget 26 db to 31 db Wa...

Страница 108: ...t as specified by the ATM Forum User Network Interface UNI specification Figure B 4 shows the pin assignments for the APIM 22R Figure B 4 APIM 22 Pin Assignments Physical Interface STS3 Media Type Cat...

Страница 109: ...nterasys ships the APIM 67R with the following default jumper settings Receive channel jumper grounded Transmit channel jumper not grounded Figure B 5 shows the location and default setting of each ju...

Страница 110: ...cifications B 6 APIM and VAPIM Specifications Figure B 5 APIM 67R Default Jumper Settings Figure B 6 APIM 67 2825_32 APIM 67R STS LNK RECEIVE CHANNEL JUMPER GROUNDED TRANSMIT CHANNEL JUMPER NOT GROUND...

Страница 111: ...igure B 7 VAPIM 31 Physical Interface OC12 Media Type Multimode Fiber Data Rate 622 Mbps Connector Type SC Transmit Power 14 db to 22 5 db Receive Sensitivity 14 db to 26 db Loss Budget 12 db to 14 db...

Страница 112: ...TIONS Figure B 8 VAPIM 39 Physical Interface OC12 Media Type Single Mode Fiber Data Rate 622 Mbps Connector Type SC Transmit Power 8 db to 15 db Receive Sensitivity 28 db Loss Budget 13 db to 20 db Wa...

Страница 113: ...S Figure B 9 VAPIM 39LR Physical Interface OC12 Media Type Single Mode Fiber Data Rate 622 Mbps Connector Type SC Transmit Power 2 db to 3 db Receive Sensitivity 34 db to 36 db Loss Budget 29 db to 38...

Страница 114: ......

Страница 115: ...M Connections Screen 3 10 connection table 3 10 connections by virtual interface 3 11 ATM LEC Screen 3 36 ATM LEC Table Screen viewing active LECs 3 38 ATM Screen discovery ELAN setup 3 9 LAN emulatio...

Страница 116: ...n Elements 3 2 command fields 3 4 event message field 3 3 input fields 3 4 selection toggle fields 3 4 Screens add delete entry 3 21 creating PVCs 3 22 deleting PVCs 3 23 encapsulation type 3 22 modif...

Страница 117: ...nabling disabling LECs 3 44 modifying LECs 3 47 LEC ARP cache 3 52 searching the LEC ARP cache 3 54 signalling enabling disabling the ILMI 3 59 enabling disabling UNI 3 60 restarting the ILMI 3 60 res...

Страница 118: ......

Отзывы: