Frequently Asked Questions
Applications
1. Do changes in the ozone levels affect the transmission of SENCITY®LINK?
2. How hot can the case of SENCITY®LINK be?
3. Does SENCITY®LINK work as a DHCP Relay agent?
4. Does SENCITY®Link support VLAN tags?
5. Can the SENCITY®LINK be operated at a distance below 25m (80ft)?
6. Is there an ability to do “bandwidth-choking”? Can the throughput of the link be forced to a lower datarate?
Installation
7. Does the SENCITY®LINK support CAT-5 cable crossover feature?
8. How hot can the case of SENCITY®LINK be?
9. What is the maximum distance that can be achieved on the Power-over-Ethernet cable?
10. What is Power over Ethernet (PoE)?
Questions to Environmental Impact
11. The operation of the Sencity®Link 60 generates radiation. Could these harm people?
12. Could it be harmful stand in the line between transmitter and receiver?
13. What is meant by penetration in this context?
14. How do you ensure the electric smog at workplaces does not increase further, with the application of Sencity®Link 60?
15. Are there any differences in the radiation loading compared to cellular operation resp. GSM antennas?
16. Does the higher data rate in the 60-GHz-frequency-band therefore require more power and detach more and dangerous radiation?
17. Can the Sencity®Link 60 be switched off in order to decrease irradiation? Is it transmitting permanently or just on demand?
18. How much power does the Sencity®Link 60 require? Is it a power eater?
1. Do changes in the ozone levels affect the transmission of SENCITY®LINK?
The ozone level in the atmosphere does not affect the transmission of SENCITY®LINK system. At 60GHz the O3 (ozone) absorption is negligible.
The ozone absorption peak lines are at 101, 110 and 165 GHz.
2. How hot can the case of SENCITY®LINK be?
The case of the terminal is 15°C hotter than the ambient temperature. This means at an ambient temperature of 30°C (86°F) the case of the terminal can have 45°C (113°F).
3. Does SENCITY®LINK work as a DHCP Relay agent?
The SENCITY®LINK system does not support DHCP Relay (RFC3046).
The system is working as a bridge and will foreward any DHCP communication.
4. Does SENCITY®Link support VLAN tags?
The SENCITY®Link System supports VLAN tags.
VLAN tags are defined into IEEE 802.1Q. This standard defines the operation of Virtual LAN (VLAN) bridges that permit the definition, operation and administration of Virtual LAN topologies within a bridged LAN infrastructure.
5. Can the SENCITY®LINK be operated at a distance below 25m (80ft)?
The SENCITY®LINK (SL60-100-57/64-38-E-O) can operate at distances below 25m (80ft) without any damage of the unit.
The major difficulty by deploying the link is to avoid the saturation of the receiver module. This can be done by intentional misalignment or by intentionally attenuate the signal.
Please contact the technical service for specific support for your application.
6. Is there an ability to do “bandwidth-choking”? Can the throughput of the link be force to a lower datarate?
The SENCITY®Link is transparent for the network and behaves like an ethernet cable. For that reason there is no way to reduce the datarate or to influence or control the data stream.
To do "bandwidth-choking" an external network equipment, e.g. managed switch, is needed.
7. Does the SENCITY®LINK support CAT-5 cable crossover feature?
The SENCITY®LINK terminal supports CAT-5 cable crossover feature.
The implemented auto-sense function will detect remote transmit and receive pairs of the Ethernet cable, and correctly assign the transmit and receive pairs from the SENCITY®LINK terminal.
8. How hot can the case of SENCITY®LINK be?
The case of the terminal is 15°C hotter than the ambient temperature. This means at an ambient temperature of 30°C (86°F) the case of the terminal can have 45°C (113°F).
9. What is the maximum distance that can be achieved on the Power-over-Ethernet cable?
PoE is in accordance with the standard 802.3af limited to the maximum distance of the Ethernet cable which is 100m.
10. What is Power over Ethernet (PoE)?
Power over Ethernet refers to the ability to power network devices directly over the existing data connection, eliminating the need for an external power supply for each device.
With Power over Ethernet, devices as SENCITY®Link can safely receive power over LAN cabling without the need of an additional power infrastructure.
Power over Ethernet is a necessity for the SENCITY®Link system and is compliant to IEEE 802.3af resp. 802.3at.
11. The operation of the Sencity®Link 60 generates radiation. Could these harm people?
In contrast to other devices on lower frequency bands, the 60 GHz radiation is attenuated by bare oxygen and loses its energy (resp. penetration) quickly. Therefore at this frequency transmitter and receiver have to be in “line of sight” and distances of a maximum of 1’600 are possible. Corresponding the radiation is not representing a danger to men and animals.
12. Could it be harmful stand in the line between transmitter and receiver?
Because transmitter and receiver of the Sencity®Link 60 have to be in “line of site”, there must not be any obstacle between them to spoil the line. Therefore transmitter and receiver are usually installed on rooftops or house fronts. Nevertheless, if a person should appear between transmitter and receiver the penetration of the impact (resp. the so called radiates) on this frequency band as low as they are would decrease heavily in impinging on an obstacle and not be able to intrude into it.
13. What is meant by penetration in this context?
In wireless connection technologies penetration means the impact on an obstacle. At lower frequencies the radiation have higher penetration and can therefore – e.g. FM radio transmitter – also be received inside buildings. At higher frequencies the penetration decreases. Therefore in 60-GHz-radio-technology transmitter and receiver have to be in “line of sight”, because the radiation cannot penetrate through obstacles.
14. How do you ensure the electric smog at workplaces does not increase further, with the application of Sencity®Link 60?
On the one hand transmitter and receiver are usually installed on rooftop or house fronts, because they have to be in “line of sight” and therefore workplaces are prevented. On the other hand the radiation from the transmitter is strongly focussed on the receiver, so the radiation loading is heavily decreased.
15. Are there any differences in the radiation loading compared to cellular operation resp. GSM antennas?
There are two major differences in this context: First a cell phone in order to gain maximum receiving radiates almost in a radius of 360° and irradiates everything within this range. The directivity of the Sencity®Link 60 transmitter is focussed on only 2° - comparable to a laser beam – in order to reach a distance of up to 1’600m. Outside of this radius there is hardly any radiation. The second difference is that cell phones operate on lower frequencies and therefore require a lot more power – especially inside buildings – in order to be reached by the antenna. In the 60-GHz-frequency-band transmission requires much less power wherefore transmitter and receiver have to be in “line of sight” and there must not be any obstacles between.
16. Does the higher data rate in the 60-GHz-frequency-band therefore require more power and detach more and dangerous radiation?
No, the data rate in units of Kbit and Mbit are not in a linear relation to the required power in the transmission. The higher frequency needs less power to attain an unequally higher data rate. In lower frequency bands that are used for cellular phones, the effect is not decreasing as quickly as in higher frequency bands. Therefore a better accessibility between transmitter and receiver is possible.
17. Can the Sencity®Link 60 be switched off in order to decrease irradiation? Is it transmitting permanently or just on demand?
It is possible to switch it off but it makes no sense because mostly the links are part of a data network. Although it could be done by coupling a timer to the injector or connect it to the network resp. switch it off manually. After reconnecting the Link, the two terminals will synchronise automatically within seconds.
18. How much power does the Sencity®Link 60 require? Is it a power eater?
No, absolutely not. The device only needs 18W. Similar devices in the market need 5-10 times as much power. Additionally the device can be operated over a standardised “Power over Ethernet” injection, which is already integrated in most network components. With this data plug also the power injection is connected. Another advantage of the device (plug&play.)