Akuvox - E21A Vandal Resistant IP Door Intercom Audio Only
- CCTV Lens Guide
- Hard Drive Size Guide
Unless selecting a vari-focal camera (with an adjustable lens) It is important to select the correct camera lens option for where the camera is to be positioned. A smaller lens will give you a wider angle but will be "zoomed out more", while a bigger lens will narrow the angle down and "zoom in more". See below to give you some idea on angles of Megapixel HD Cameras:
| Lens in mm | Approx Viewing Angle (degrees) | Ideal Distance (metres) | Typical usage/notes |
|---|---|---|---|
| 2.8 | 106 | <6 | For seeing as much of the immediate area as possible such as above a doorway/low down/garage soffits (edges can appear slightly warped/distorted) - clearly "zoomed out" |
| 3.6/4 | 83-90 | <12 | A great general purpose option giving great coverage still in the corner of a room or higher up on second floor soffits with less distortion - more of a natural "zoom" |
| 6 | 56 | 6-20 | Narrows down the angle and zooms in to look past the immediate area a little to gain more detail - down a driveway for example from higher up |
| 12 | 24 | 20+ | Zooms in significantly more to look at a gate, entrance or adjascent building |
| 16 | 19 | 24+ | As above but more so |
The amount of hard drive space you require is dictated by how many cameras, as well as their resolution, frame rate settings, and whether you have H.265 encoding enabled or not to save space (We advise turning it on to double the capacity shown below with ease).
Finally, you can often make your storage space last a lot longer by enabling motion-detected recording rather than continuous, especially if there are long periods of no activity (to perhaps double or more these figures again).
|
Resolution (Megapixels) |
Days of storage provided by 1TB per camera (continuous - full 25 frames per second) |
Days of storage provided by 1TB per 4 cameras (continuous - full 25 frames per second) |
Days of storage provided by 1TB per 4 cameras (50% motion- 15 frames per second) |
|---|---|---|---|
| 1 | 44 | 11 | 36 |
| 2 | 22 | 5 | 18 |
| 3 | 17 | 4 | 14 |
| 4 | 11 | 3 | 9 |
| 5 | 9 | 2 | 8 |
| 6 | 8 | 2 | 6 |
| 8 (4K) | 5 | 1 | 4 |
| 12 | 4 | 0.5 | 3 |
As a rule of thumb, we recommend 2 Terabytes for a 4 x 4/5MP HD camera setup, as this should give you approx 2 weeks using H.265 @ 20fps and that is on continuous, not motion-detected recording.
(You may only require the full 25 frames per second on certain cameras if things are fast-moving - ie above a till)
You can also use the Hikvision online calculator to work out what works best for you specifically: https://tools.hikvision.com/ca...
(All of our hard drives come fitted and are CCTV-specific from one of the major brands)
The E21A Vandal-resistant IP Door Intercom from Akuvox combines elegance and simple design with robust material to safeguard this product in public spaces. Audio only, this intercom provides simple and easy use.
The Akuvox E21A robust Intercom features single call-button, audio-only communication (no camera) and high quality IP-rated microphone and loudspeaker.
The E21A provides immediate communication where security is a focus and can be used either indoors or outdoors thanks to an ingress protection rating of IP65.
This IP-connected professional intercom door station allows complete system control and distribution over LAN, WAN and web networks and is PoE (Power over Ethernet) compatible for greater installation flexibility.
Flush or Surface Mountable:
This unit can be flush-mounted (E21XF) or surface-mounted (E21XS Silver or E21XSBLK Black) using back box options sold separately.
Interface Features
• 2xRJ45 10/100 Mbps Ethernet ports
• Input relay: 2 relays for alarm alert
• Output relay: 2 relays for door opener
SIP Features
• SIP v1 (RFC2543), SIP v2 (RFC3261)
• Line: 2 SIP accounts
Audio Features
• 1 built-in microphone with IP67 rating
• 1.5W speaker with IP66 rating
• Codec: G.711a, G.711μ, G.722, G.729 and LPCM
• Speech quality: 7 kHz
• Echo cancellation
• Voice activity detection
• Comfort noise generator
Phone Features
• Auto-answering
• Volume control
• Direct IP calling
Application Scenarios
• Education: campuses
• Healthcare: hospitals, medical centers
• Logistics & Transportation: airports, parking facilities
• Industries: industrial parks of Manufacturing, Energy, Metal & Mining, Chemical industries
- Vandal-resistant body
- 1 call button
- 2 input relays and 2 output relays
- Premium audio quality
- SIP/PoE
- Outdoor-rated with IP67 grade microphone and IP66 grade speaker (overall IP65 rated)
- Vandal resistant all-aluminium body
- Flush or Surface mountable (back boxes sold separately)
Description E21A
- Enclosure Rating IP65
- Button 1 panic button and 1 reset button on board
- Call Indication 1 RGB LED (red, green, blue)
- PoE IEEE802.3af
- Power Consumption 12v DC input
- Flush-mount Installation Requires E21XF Back Box (sold separately)
- Surface-mount Installation Requires E21XS (silver) or E21XSBLK (black) Back Box (sold separately)
- Body Material 316 grade stainless steel
- Dimensions with Flush Mount Kit 210(H) x 120(W) x 61(D) mm
- Weight (Net) 0.85kg
- Weight (Gross) 1.00kg
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