Akuvox - E20S Push Button Audio Intercom Emergency Station
- 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 E20S from Akuvox is a IP Vandal Resistant Door Intercom with 316-grade stainless steel housing. It is audio only, making this intercom simple and easy use.
The Akuvox E20S robust Intercom features single call-button, audio-only communication (no camera) and high quality microphone and loudspeaker.
The E20S provides immediate communication where security is a focus and is able to withstand deliberate acts of vandalism in high-traffic public areas such as train stations and ATM machines thanks to it having the highest impact protection rating of IK10.
The E20s Vandal Resistant Door Intercom is PoE (Power over Ethernet) compatible for greater installation flexibility.
Flush Mountable Only:
This unit can be flush-mounted and is compatible with UK single in-wall backboxes.
- Vandal resistant body, with a panic button
- PoE (IEEE802.3af, Power-over-Ethernet)
- Two-way audio communication over IP networks with Echo Cancellation feature
- Support advanced group conference call features
- Complies with SIP standard for easy integration in every SIP capable PBXes
- For indoor use only
Description E20S
Front Panel 316 grade stainless steel
SIP Protocol SIP v1 (RFC2543), SIP v2 (RF3261)
SIP Account 1 SIP account
Button 1 panic button
Ethernet Port RJ45, 10/100Mbps adaptive
Audio Codecs G.711a, G.711μ, G.722
Power Supply PoE (IEEE802.3af) only
QoS support Yes
Auto Answer support Yes
Indicator 1
Microphone / Speaker 1/1
Network Mode DHCP or Static IP
System Time NTP for auto time setting
Working Humidity 10~90%
Working Temperature -20°C ~ +55°C
Storage Temperature -25°C ~ +60°C
Installation Flush-mounted
Protocols Support : IPv4, HTTP, HTTPS, FTP, SNMP, DNS, NTP, RTP, TCP, UDP, ICMP, DHCP, ARP
Dimensions 100(W) x 100(H) x 38(D) mm
Weight (Net) 0.85kg
Weight (Gross) 0.60kg
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