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Dahua Technology VTH2421FW-P User Manual Download Page 32

1.3  Alarm Port

Figure 1-28 Alarm port

1.4  Function

Wi-Fi Networking

Connect to Wi-Fi networks.

The Wi-Fi function is available on select models.

Video/Voice Call

Make video or voice call to other VTOs and VTHs.

Monitoring

Monitor fence station, VTO and IPC devices (only supported by certain models).

Concierge

Make calls to the Management Center.

Auto Snapshot

Take snapshots when calling or monitoring, and store them in the SD card.

The SD card is available on select models.

DND (Do Not Disturb)

Mute all message and call notifications.

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Summary of Contents for VTH2421FW-P

Page 1: ...V1 0 2 Digital VTH Version 4 7 User s Manual...

Page 2: ...ion History Version Revision Content Release Time V1 0 2 Added new model November 2023 V1 0 1 Added new model September 2023 V1 0 0 First release August 2023 Privacy Protection Notice As the device us...

Page 3: ...nual Please contact customer service for the latest program and supplementary documentation There might be errors in the print or deviations in the description of the functions operations and technica...

Page 4: ...while the adapter is powered on Strictly comply with the local electric safety code and standards Make sure the ambient voltage is stable and meets the power supply requirements of the device Do not...

Page 5: ...2 Rear Panel 10 1 2 1 VTH2421F Series 11 1 2 2 VTH2611L 2612L Series 12 1 2 3 VTH2621G Series 13 1 2 4 VTH2622G Series 14 1 2 5 VTH2624G Series 15 1 2 6 VTH5221D Series 17 1 2 7 VTH5241D Series 18 1 2...

Page 6: ...ng 60 3 6 3 Card Management 64 3 6 4 WLAN 65 3 6 5 Mode Setting 66 3 6 6 General Setting 67 3 6 7 System Information 74 3 7 Project Settings 76 3 7 1 Forget Password 76 3 7 2 Network Settings 76 3 7 3...

Page 7: ...isit Records 106 4 8 Setting 107 5 DMSS App 109 5 1 Downloading DMSS 109 5 2 Registration and Login 109 5 3 Adding VTH to DMSS 111 5 4 Configuring Arm and Disarm 113 5 5 DMSS Calling VTH 115 5 6 DMSS...

Page 8: ...1 Product Overview The following front and rear panel figures are for reference only 1 1 Front Panel 1 1 1 VTH2421F Series Figure 1 1 Front panel 1...

Page 9: ...1 1 2 VTH2611L 2612L Series Figure 1 2 Front panel 2...

Page 10: ...1 1 3 VTH2621G VTH2622G Series Figure 1 3 Front panel 3...

Page 11: ...1 1 4 VTH2624G Series Figure 1 4 Front panel 4...

Page 12: ...o hang up During monitoring press to speak to unit VTO villa VTO fence station and verifying VTO During speaking press to exit speaking Menu Go to main menu Monitor In standby mode press to monitor th...

Page 13: ...o hang up During monitoring press to speak to unit VTO villa VTO fence station and verifying VTO During speaking press to exit speaking Menu Go to main menu Monitor In standby mode press to monitor th...

Page 14: ...1 1 7 VTH5421E Series Figure 1 7 Front panel 7...

Page 15: ...1 1 8 VTH5421H VTH5422H Series Figure 1 8 Front panel 8...

Page 16: ...1 1 9 VTH5441G Series Figure 1 9 Front panel 9...

Page 17: ...8621K VTH8622K VTH8641K VTH8642K Series Figure 1 10 Front panel 1 2 Rear Panel Port positions at the rear panel may differ depending on the actual product For details about the alarm port see 1 3 Alar...

Page 18: ...1 2 1 VTH2421F Series Figure 1 11 Rear panel Table 1 3 Rear panel description No Port 1 Power port 2 Network port 3 Alarm port 11...

Page 19: ...1 2 2 VTH2611L 2612L Series Figure 1 12 Rear panel Table 1 4 Rear panel description No Port 1 Alarm port 2 2611L Power input port 2612L 2 wire port 3 Network port 12...

Page 20: ...1 2 3 VTH2621G Series Figure 1 13 Rear panel non 2 wire Table 1 5 Rear panel description No Port 1 Alarm port 2 Power input port 3 Network port 13...

Page 21: ...1 2 4 VTH2622G Series Figure 1 14 Rear panel 2 wire Table 1 6 Rear panel description No Port 1 Alarm port 2 Power port 3 Network port 14...

Page 22: ...1 2 5 VTH2624G Series Figure 1 15 Rear panel Table 1 7 Rear panel description No Port 1 RS 485 port 2 Power port 3 Alarm port 4 4 wire port 5 Network port 15...

Page 23: ...16 4 wire port of VTH Table 1 8 Port description Port Description G Connect to the GND port of VTO A Connect to the audio port of VTO V Connect to the video port of VTO P Connect to the power port of...

Page 24: ...1 2 6 VTH5221D Series Figure 1 17 Rear panel Table 1 9 Rear panel description No Port 1 Reset button 2 Network port 3 RS 485 extended port 4 Alarm port 5 SD card slot 17...

Page 25: ...Figure 1 18 RS 485 extended port 1 2 7 VTH5241D Series Figure 1 19 Rear panel Table 1 10 Rear panel description No Port 1 Network port 2 RS 485 extended port 3 Alarm port 18...

Page 26: ...Figure 1 20 RS 485 extended port 1 2 8 VTH5421E Series Figure 1 21 Rear panel Table 1 11 Rear panel description No Port 1 RS 485 extended port 19...

Page 27: ...No Port 2 Power port 3 Network port 4 Alarm port Figure 1 22 RS 485 extended port 1 2 9 VTH5421H VTH5422H Series Figure 1 23 Rear panel 20...

Page 28: ...Table 1 12 Rear panel description No Port 1 Alarm port 2 RS 485 and power output port 3 5421H Power input port 5422H 2 wire port 4 Network port Figure 1 24 RS 485 port 21...

Page 29: ...1 2 10 VTH5441G Series Figure 1 25 Rear panel Table 1 13 Rear panel description No Port 1 Network port 2 Alarm port 22...

Page 30: ...2 11 VTH8621K VTH8622K Series Figure 1 26 Rear panel Table 1 14 Rear panel description No Port 1 Alarm port 2 RS 485 and power output port 3 8621K Power input port 8622K 2 wire port 4 Network port 23...

Page 31: ...2 12 VTH8641K VTH8642K Series Figure 1 27 Rear panel Table 1 15 Rear panel description No Port 1 RS 485 and power output port 2 Alarm port 3 8641K Power input port 8642K 2 wire port 4 Network port 24...

Page 32: ...video or voice call to other VTOs and VTHs Monitoring Monitor fence station VTO and IPC devices only supported by certain models Concierge Make calls to the Management Center Auto Snapshot Take snapsh...

Page 33: ...p to 8 alarm devices Playback Play back videos and pictures in the SD card The SD card is available on select models Alarm Alarms will trigger linkage and be sent to the Call Center Record View call a...

Page 34: ...the snapshots from 7 inch device as the example The interfaces on 4 3 inch device is the similar with that on 7 inch device The snapshots are for reference only Procedure Step 1 Select a region and th...

Page 35: ...Figure 2 2 Language Step 3 Select Apartment or Villa and then tap Next This section takes Villa as an example Figure 2 3 Scene Step 4 Select First time Config and tap Next 28...

Page 36: ...le DHCP and then tap Next Figure 2 5 IP settings Step 6 Set a password for the VTH and then tap Next You can select the Email and then enter the email address for resetting the password The password i...

Page 37: ...ll If there are many devices tap to initialize all devices that are displayed in the list Step 8 After initialization tap Edit to configure the detailed information of the device The device you are us...

Page 38: ...information Step 9 Configure the parameters and then tap OK Configure the network parameters if you want to configure the VTH Figure 2 8 Configure the VTH Configure the network parameters if you want...

Page 39: ...configure the main VTO Figure 2 10 Configure the main VTO Step 10 Tap Configure to finish the initialization Log out Tap to directly go to the home screen If you edit the parameters and tap Log out th...

Page 40: ...e 2 11 Configure the device 2 2 Initialization through the ConfigTool You can initialize the VTH and configure the building parameters through the ConfigTool For details see the ConfigTool user s manu...

Page 41: ...and date 3 Call Call other VTOs and VTHs View and manage the contacts and call records Call the DMSS app 4 Info View delete and clear announcements or security alarm information When the VTH does not...

Page 42: ...ce 11 Scene Tap to select one of the following arming modes Sleep Away Home or Custom 12 View the other main functions including restarting the system and calling the Management Center Edit the home s...

Page 43: ...Select the functions that you want to be displayed on the home screen and then tap to save the configuration and are displayed by default 3 functions can be displayed or modified on the home screen Fi...

Page 44: ...back Tap a call record to call back Delete Tap select the record and then tap to delete a record Clear Tap to clear all record in the current tab All or Missed Call If storage is full the oldest reco...

Page 45: ...Figure 3 5 Contacts Adding the User 1 Tap Figure 3 6 User information 2 Enter the information 3 Tap 38...

Page 46: ...ake sure that resident to resident call function has been enabled Call function is used by VTH to call VTH VTO VTS and the platform If both VTHs have a camera bilateral video call can be provided 3 3...

Page 47: ...dd the building number For example dial 1 1 101 to call Building 1 Unit 1 Room 101 If main VTH 101 0 calls extension 101 1 please enter room no 1 if the extension calls main VTH please enter room numb...

Page 48: ...3 9 Call answered 3 3 3 2 From Contact Procedure Step 1 Select Call Step 2 Tap next to the user to call 3 3 4 Call from User When receiving calls from other VTHs the following interface will be displa...

Page 49: ...he voice 3 3 5 Call from VTO Procedure Step 1 Dial VTH room number such as 9901 at VTO to call VTH Step 2 On the VTH screen tap Answer If the network connection is bad the device will adjust the video...

Page 50: ...nel unlock If the icon is gray it means that the unlock function of this channel is not available The microphone can be used Tap the icon and the microphone cannot be used Tap to switch the IPC that i...

Page 51: ...stalled Videos are stored in SD card of this VTH If SD card is full the earlier videos will be covered The SD card is available on select models Reduce volume Increase volume Answer calls Hang up 3 3...

Page 52: ...D card for these two functions Only certain models support SD card If the storage in the Device or SD card is full the oldest records will be overwritten Back up the records as needed 3 4 1 Security A...

Page 53: ...Figure 3 14 Security alarm 3 4 2 Publish Information Select Info and then you can view and manage all messages Figure 3 15 Publish information 46...

Page 54: ...est Message Select Info and then you can view and manage all messages Figure 3 16 Guest message 3 4 4 Video Pictures Select Info and then you can view and manage the pictures and videos Figure 3 17 Re...

Page 55: ...O When adding VTOs make sure that the username and password of each device is consistent with the web login username and password Otherwise monitoring will not work properly Procedure Step 1 Select Mo...

Page 56: ...ction of this channel is not available Take snapshot An SD card is needed to use this function The SD card is available on select models Tap to start recording and it will stop when the call is comple...

Page 57: ...ng image from this IPC Display the serial number of the VTO or fence station in QR code Scan the QR code in the app to add it to the app and then you can monitor the VTO from your smart phone 3 5 2 Mo...

Page 58: ...Figure 3 20 IPC Step 2 Tap Add IPC or Figure 3 21 Add IPC Step 3 Configure the parameters Table 3 4 Parameter description Parameter Description Device Type Select IPC or NVR 51...

Page 59: ...nected device Encryption Enable it if the IPC to be added is encrypted Network Config IP IP address of the IPC NVR Username The login username of the webpage of the IPC NVR Password The login password...

Page 60: ...PCs All the IPCs will be deleted in this way Be careful 3 5 2 4 Monitoring Monitor the IPC Procedure Step 1 Select Monitor Step 2 Tap to monitor the IPC Figure 3 22 Monitoring IPC 3 5 3 Favorites Disp...

Page 61: ...g and other rings There is an SD card on the VTH and users can import ring tones to the SD card Ring tones must be stored in the Ring folder at the root directory of the SD card The SD card is availab...

Page 62: ...6 1 1 VTH Ring Set the ring for this VTH Procedure Step 1 Select Setting Figure 3 24 Call setting Step 2 Tap VTH Incoming Call Config and then configure the parameters Figure 3 25 VTH ring setting 55...

Page 63: ...VTO Ring Set a ring for the connected VTO and the device supports to set maximum 20 VTOs Procedure Step 1 Select Setting Step 2 Tap VTO Incoming Call Config and then configure parameters Figure 3 26 V...

Page 64: ...only and extension VTH synchronizes with the main VTH Procedure Step 1 Select Setting Step 2 Tap Call Forwarding Config Figure 3 27 Call forwarding Step 3 Enter the VTH number in the corresponding for...

Page 65: ...ig screen To forward to a user of another building or unit the forward number is Building Unit VTH room number For example input 1 1 101 for 101 of Unit 1 Building 1 To forward to a user of the same u...

Page 66: ...ng 2 Step 2 Configure the parameters Table 3 8 Description of call setting parameters Parameter Description Mute Ring Tap to enable Mute Ring Microphone Volume Tap and to adjust the microphone volume...

Page 67: ...en the VTO calls the VTH Tap Info to view them An SD card is needed for this function After enabling auto capture Auto Delete Snapshots after Call Answered will be displayed which when turned on snaps...

Page 68: ...ector type It must be the same as the detector type Alarm Status Instant Alarm When armed if an alarm is triggered the device produces a siren at once and enters the alarm status Delay Alarm When arme...

Page 69: ...ter configuring the Delay Alarm status for the area if the delay time comes to an end the area will enter the arming status The configured time is only effective in areas with Delay Alarm If multiple...

Page 70: ...ee wireless device user s manual for details After coding is successful the area information will be displayed Step 5 Tap the wireless zone name to configure the zone The Instant Alarm status cannot b...

Page 71: ...tion Configure the alarm duration from 5 to 120 seconds Ringtone Select the ringtone Volume Tap and to adjust the call volume 3 6 3 Card Management Issue and manage card information This function is o...

Page 72: ...IP cannot be set in the same segment WLAN 1 Select Setting and then tap WLAN 2 Tap select a Wi Fi and then enter the password to connect to the network Figure 3 34 Wi Fi Wireless IP 1 Select Setting...

Page 73: ...zed needs Step 3 Turn on or turn off the area you selected to enable or disable the arm mode Multiple areas can be added into one arm mode at the same time One area can be added into different modes F...

Page 74: ...VTH time display password and others 3 6 6 1 Time Setting and DND Set VTH system time time zone and DND Parameters at this screen are set on main VTH only and extension VTH synchronizes with main VTH...

Page 75: ...Tap DND If enabled configure the start and end time and then select the days that you want to repeat the DND mode You will not receive any call or message during this period You can directly enable D...

Page 76: ...ff after a define time of inactivity Adjust the time by taping or Tap to Clean Tap it and then the screen will be turned off and locked for 30 seconds During the period clean the screen 3 6 6 3 User P...

Page 77: ...Figure 3 39 Password Step 3 Tap Change User Password and then enter the old password new password and then confirm password Figure 3 40 User password Step 4 Tap to save the configuration 70...

Page 78: ...ned and then confirm it The username is user by default The password must consist of 8 to 16 characters Figure 3 41 Network password Step 5 Tap Results The VTH would automatically generate a QR code t...

Page 79: ...MSS QR code 3 6 6 4 2 Changing Network Password Change your current network password Procedure Step 1 On the home screen select Setting Password Step 2 Tap Change Network Password Step 3 Enter the old...

Page 80: ...rk Password Step 3 Tap Forgot Password enter the password that you configure during the initialization in the Password Verification window and then enter the new password and confirm it Step 4 Tap 3 6...

Page 81: ...cording at the end of recording time Configure the time The Record duration can be configured from 15 s to 300 s Touch Sound After enabling touch sound there will be a ring when touching the screen Ta...

Page 82: ...erver parameters and other information For details see 3 7 Project Settings Language Select the language of the device SD Card View the SD card status including the used capacity and the total capacit...

Page 83: ...QR code with any code scanning app bind your email box send it by email to the specified email address on the screen to obtain a security code Step 4 Tap Next Step 5 Enter the password and confirm it...

Page 84: ...re 3 48 Network settings 1 Figure 3 49 Network settings 2 3 7 3 Configuring VTH Procedure Step 1 On the main screen select Setting Project Settings Step 2 Enter the password and then tap OK Step 3 Tap...

Page 85: ...101 1 IP address username and password of the main VTH Default username is admin and the password is the one set during initialization Step 5 Turn on the following functions as needed SSH The debuggi...

Page 86: ...ns to bind them with the VTH Procedure Step 1 On the main screen select Setting Project Settings Step 2 Enter the password and then tap OK Step 3 Tap Figure 3 51 VTO configuration Step 4 Add a VTO or...

Page 87: ...figuration Add a sub VTO or fence station 1 Tap next to the sub VTO and then enter the sub VTO or fence station name IP address username and password 2 Tap Tap or to turn page and add more sub VTOs or...

Page 88: ...figuration 3 7 5 Searching Devices Procedure Step 1 On the main screen select Setting Project Settings Step 2 Enter the password and then tap OK Step 3 Tap The device searches for the devices in the s...

Page 89: ...gure 3 54 Search devices 3 7 6 Configuring SIP Server Procedure Step 1 On the main screen select Setting Project Settings Step 2 Enter the password and then tap OK Step 3 Tap Figure 3 55 SIP server 1...

Page 90: ...dress of the VTO Network Port 5080 when a platform works as the SIP server 5060 when a VTO works as the SIP server Username Keep it default or turn on Custom Name and then you can edit the username Re...

Page 91: ...3 Tap Table 3 14 Description of reset parameters Parameter Description Reset Password Tap to enable this function If turned off you cannot reset the password Bound Email Enter the email address that...

Page 92: ...using the DMSS function For details see 3 6 6 4 1 Creating Network Password Figure 3 58 Onscreen prompt Step 2 After you create a user account tap DSS or DMSS tab to view the QR code Scan the DMSS QR...

Page 93: ...Figure 3 59 DSS QR code Figure 3 60 DMSS QR code 86...

Page 94: ...Home An arming mode that allows you to arm the system when inside the area of the alarm system Away Arm the system when you leave the area of the alarm system Sleep An alarming mode that allows you to...

Page 95: ...If you enable Property Management when editing the home screen tap on the home screen to call management center If you do not enable it tap on the home screen and then tap to call management center Pl...

Page 96: ...Figure 3 62 Cloud update 89...

Page 97: ...takes Android OS as an example 4 1 Downloading the App Prerequisites Before you start make sure the VTO VTH and DSS server are properly connected Procedure Step 1 On the VTH main screen tap Step 2 Sc...

Page 98: ...Figure 4 2 Registration interface Step 2 Tap and then scan the Register code on the VTH See Step 2 in 4 1 Downloading the App 91...

Page 99: ...3 Confirm IP address and port number Step 3 Verify the IP address and port number and then tap Confirm Step 4 Enter the username and password and then tap Registration You can add 5 users to one VTH a...

Page 100: ...sh notifications of call messages on the mobile phone make sure that notifications of the app are enabled on your smart phone and you are logged in to the app 4 3 1 Forwarding Calls Confirm your SIP I...

Page 101: ...ap Forward Select forwarding type as needed Always Forward All calls to this VTH will be forwarded Forward when Busy If the VTH is busy the call will be forwarded Forward when Not Answered Any call th...

Page 102: ...of the SIP ID to 100 1 1 8001 100 and then all users linked to this VTH will receive the call on their smart phones at the same time Step 5 Tap to enable the forwarding type you selected and then tap...

Page 103: ...VTO 4 4 Monitoring Background Information After a VTO is added you can view its live video have two way audio talk call management center and remotely unlock the door Procedure Step 1 Log in to the ap...

Page 104: ...Figure 4 8 Monitor screen Step 2 Tap select the VTO from the channel list as needed 97...

Page 105: ...Figure 4 9 Live video Switch to another VTO Unlock the door remotely Have a two way audio talk with the VTO Call management center 98...

Page 106: ...e APP and then tap Records Figure 4 10 Call records Red phone icon The call is missed or not answered Green phone icon The call is answered Not Opened Opened Indicates whether the door is unlocked Edi...

Page 107: ...f the App first To receive messages on your smart phone make sure that notifications of the app are enabled on your smart phone and the you are logged in to the app Viewing Messages Log in to the app...

Page 108: ...Figure 4 11 Access messages Log in to the App tap Messages Alarm and then you can view alarm messages 101...

Page 109: ...Figure 4 12 Alarm messages Searching for History Messages Tap History set the start and end time and then tap SEARCH You search for messages within up to 7 days 102...

Page 110: ...essages 4 7 Visitor You can create a pass for a visitor to have access permission The pass is invalid after it is manually invalidated the visiting period expires or the visit is ended You can also vi...

Page 111: ...Pass Procedure Step 1 Log in to the APP and then tap Visitor Figure 4 14 Visitor information Step 2 Enter the information of the visitor and then tap Generate Pass Each visitor can only register one p...

Page 112: ...o send the QR code to the visitor Tap Save to save the QR code to your smartphone Step 4 Optional Tap Invalidate to cancel the appointment and then the QR code will not have access permissions Tap Inv...

Page 113: ...sit and cancelling the appointment You can also view and modify the pass View visitor status Log in to the APP tap Visitor Record View and modify a pass Tap a visitor in the list and then you can view...

Page 114: ...Figure 4 17 Visitor records 4 8 Setting You can view SIP ID and enable message subscription stream encryption message sound login by pattern and more Log in to the app and then tap Setting 107...

Page 115: ...messages See 4 6 Message for details Stream Encryption Enable it to enhance security but stream acquisition speed might slow down Gesture Draw a pattern and then you can log in by that pattern About V...

Page 116: ...view call records and messages 5 1 Downloading DMSS iOS users Search for DMSS in the App store and then download the App Android users Search for DMSS in Google Play to download the App 5 2 Registrat...

Page 117: ...Read the User Agreement and Privacy Policy and then select the I have read and agree to checkbox 4 Tap Get verification code check your email box for the verification code and then enter the code Use...

Page 118: ...Me Account Management Modify Password 5 3 Adding VTH to DMSS Procedure Step 1 Power on the VTH Step 2 On the Home screen of the app tap and then select SN Scan Step 3 Scan the QR code at the rear pane...

Page 119: ...ode screen for the first time the DMSS OR code would not appear Only after you set the network password this module would be displayed For the detailed operation see 3 6 6 4 Network Password Setting F...

Page 120: ...configured in 3 6 6 4 1 Creating Network Password Figure 5 6 Add device Step 5 Configure the time zone and then tap Done You have completed the device adding steps 5 4 Configuring Arm and Disarm Make...

Page 121: ...p An alarming mode that allows you to arm the system in the sleep time Home Mode An arming mode that allows you to arm the system when inside the area of the alarm system Always Mode Arm the system wh...

Page 122: ...e sure that the VTH and VTO are properly connected Procedure Step 1 On the Home screen tap select the VTH you have just added and then tap Device Details to go to the function screen Step 2 Tap Call V...

Page 123: ...p 1 On the Home screen tap select the VTH you have just added and then tap Device Details to go to the function screen Step 2 Tap to call the VTO you added to the DMSS If there are more than one VTO y...

Page 124: ...e 5 10 Call VTO 5 7 DMSS Unlocking Door Procedure Step 1 On the Home screen tap select the VTH you have just added and then tap Device Details to go to the function screen Step 2 Tap to unlock the doo...

Page 125: ...hat the VTH and VTO are properly connected Procedure Step 1 On the Home screen tap select the VTH you have just added and then tap Device Details to go to the function screen Step 2 Tap to view the mo...

Page 126: ...s Function Description Play Pause Mute Unmute Change the image orientation to landscape Favorites Select a video tap and then select an existing file that you want to save the video to Video stream Ta...

Page 127: ...Message screen tap Alarm Message to view the alarm recorded reported from the VTOs and VTHs Figure 5 14 Viewing alarm records 5 10 Device Sharing Once one user has added the VTH the user can share the...

Page 128: ...Step 2 Select Device Sharing Figure 5 15 Device sharing 1 Step 3 On the Device Sharing screen tap to scan the QR code of the users you want to share the device Figure 5 16 Device sharing 2 121...

Page 129: ...at receives the sharing has to refresh the Home screen to update the sharing information Related Operations To Obtain the QR Code of the User that Receives the Sharing 1 Log in to the DMSS account of...

Page 130: ...Figure 5 18 Obtain the QR code 123...

Page 131: ...Figure 5 19 Obtain the QR code 2 124...

Page 132: ...control permission and key management to prevent unauthorized personnel from carrying out physical contacts such as damaging hardware unauthorized connection of removable device such as USB flash disk...

Page 133: ...s regularly to see if the device is logged in without authorization Check device log By viewing the logs you can know the IP addresses that were used to log in to your devices and their key operations...

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