Most questions proposed by our customers can find answers in this section. If you need further assistance you can contact us directly by completing the following information
The best coaxial cable should have both its inner conductor and its braid made of copper.
The cables with higher diameter will have smaller losses in signal distribution. Occasionally, it could be impossible to install coaxial cables with an excessive diameter; in this case, adapting and selecting cables with a smaller diameter would be required, even if they would produce higher losses, especially at high frequencies. Line amplifiers are usually introduced to compensate for this.
Return loss and NEXT are statistically the most common parameters in CAT-6 networks' certification. The first is related to the alteration of the cable's characteristic impedance due to constriction, twisting or exceeding the minimum bending radius. The second has to do with an excessive unwinding of the cable when it was connected to the outlets or to the connectors.
Channel Mode (CH) and Permanent link (PL). In CH mode, the patch cords the user will need at both ends of the link are provided. In PL mode the end patch cords are not provided (this is the most common form of measurement).
It is the cable's nominal propagation speed (Nominal Velocity of Propagation). This value is specified by the manufacturer for each cable. It has to be introduced in the measuring equipment so that it can display both the correct measured length of the data cable and the exact point of failure when applicable.
The most common errors we can find in twisted pair cabling are: - Installation errors, Inadequate connections, Distorted twisting index for each pair, Connectors that do not meet the required transmission quality level, Incorrect certifier configuration, Manufacturing defects or damage of the installed twisted pairs, Defective patch cords. For all these reasons, it is essential to have every data network certified.
The dimension of the modules of a rack is stated in "heights". One "height" is equivalent to 43.5 mm. For example, a 19" sub-rack ", ref. 5301, is 5 "heights" (217.5 mm).
All. We should be meticulous when performing the connector termination, and be careful not to make loops and reels too tight. When building the connectors, the unwinding of the different cable pairs should be handled with special care not to unwind too big a portion of the cable pair.
Not always. Among the devices provided with the Dinova antenna, there is actually a power supply unit. In case of an installation that includes distribution, an active power supply may be required, since the gain it provides allows for the distribution of the signal towards multiple reception points. However, for installations involving just a receiver and an adapter (portable installations), a zAs adapter could power the Dinova antenna without the need for an extra power supply.
Operators frequently change frequencies and other transmission parameters. As a result, the new transponders and their associated parameters need to be memorized again in the receiver's memory. To do this, make an automatic search with the help of the equipment's instructions manual. If the new frequency was not stored in the receiver's database, a manual search for the specific frequency will have to be carried out.
The solution to this problem is a firmware update. The download link is :http://www.televes.com/es/content/7118-tlv0323-problema-reinicio-astra https://www.televes.com/es/7118-rsd.html
Receivers equipped with an internal modulator are not currently available in the market. To implement the above mentioned installation, the DTT receiver has to be linked to an A/V modulator.
There are 2 possible causes for this: the module itself could be damaged or the external power supply could be damaged. To know which is the case, the module should be powered with a 12 V 1,500 mA power supply.
Receivers are equipped with an active stage at the signal input. If the signal level in a given channel is too high, the saturation of this stage causes image distortion. The solution involves either including an attenuator at the antenna input, thus reducing the input level, or act upon the level of the external amplifier (if there is one) to reduce its gain.
Yes. Given the current price of energy, knowing the exact equipment power consumption is important, both for stand-by mode and for working mode. We have carried out a market research and analysed 4 DTT receivers, taking our zAs HD ref.5124 receiver as a reference; average working times were 4.5 hours a day, with 19.5 hours a day in stand-by. The results are described below: Receiver 1: power consumption is 6.56 times the power consumed by zAs HD. Receiver 2: power consumption is twice the power consumed by zAs HD. Receiver 3: power consumption is 1.18 times the power consumed by zAs HD. In short, buying low power consumption receivers is important (despite being more expensive at initial purchase), since they are cheaper in the long run.
The only items you need are: A TV outlet in the room. 1 Coaxdata in the TV outlet where your main PC is plugged. 1 Coaxdata in the TV outlet where your secondary PC is plugged. You will not have to open your PC; neither will you need any HUBs or selector switches. The installation is plug&play.
Almost always, the expression "save a penny, spend a dollar" is really true.
The inclusion of an O-ring in the F connectors prevents the risk of "flooding" of the connection. The effects can be quite disastrous and can range from degradation of the frequency response of the network to expensive breakdowns in remotely powered elements.
For this reason, and in at least outdoor cable runs, it is very convenient to always use connectors with O-ring. In indoor facilities, although the risk of water entering in the network is smaller, the O-ring can prevent the undesirable effects of condensation.
Photo of the F connector F where the O-ring is visible.
The Gateway needs to be configured to be detected by a CoaxManager.
The Gateway (Ref. 769301) is very particular type of slave. Its internal configuration has two independent blocks: a CoaxData slave with a coaxial interface (WAN) and a LAN interface which has two different interfaces: ethernet and WiFi.
In the installation and testing process the CoaxManager is executed by an ethernet port of the Gateway. When doing this, it is important to bridge the ethernet interface with the Coaxdata slave. This means that the Gateway should be previously configured in “AP Bridge”. If not CoaxManager will not be able to access the coaxial part of the device.
Once the installation and network optimization are set up, the initial configuration Router mode needs to be restored, as well as adjusting it depending on the final configuration required.
The GPON standard (providing services to the users) is defined by its class (A, B, C, B+, and C+). They differ in the transmitting power and the receiving sensitivity. Most common classes B+ (OLT/ONT) powers lie in the 1.5 dBm - 5 dBm / 0.5 dBm - 5 dBm ranges respectively. Receiving sensitivities <28 dBm / <27dBm respectively. Most common classes C+ (OLT/ONT)powers lie in the 3 dBm - 7 dBm / 0.5 dBm - 5 dBm ranges respectively. Receiving sensitivities <32 dBm / <30 dBm respectively.
The Ethernet standard (data sharing) was developed in order to share information among multiple devices with large capacity. This type of network does not have fixed transmission speeds and wavelengths like GPON networks. One of the most popular standards for Gigabit Ethernet (1000 Mbits) over optical fibre is 1000BASE-LX (1260 nm... 1360 nm,up to 10 km, single mode). For 10 Gigabit Ethernet the most popular standard is 10GBASE-LR (1310 nm, up to 10 km, single mode). In addition, most popular standards for twisted pair (up 100 m) are 1000BASE-T (CAT5, CAT5e or CAT6), and 1000BASE-TX (CAT6 or CAT7).
There was a need to create a device capable of sending/receiving and managing information from a single equipment called transceiver. The most widely used format is SFP (Small Form-factor Pluggable).
Currently, Televes provides two SFP for Gigabit Ethernet (fibre and twisted pair), one SFP+ for 10Gigabit Ethernet (fibre), and two SFP for GPON:
In some cases, the transmodulation of specific satellite channels into COFDM will probably not be enough; this is why the option is available to add the IF of a satellite polarity to the COFDM signal flow. Furthermore, that signal flow may be transmitted over optical fibre by means of an appropriate low-loss optical transmitter, thus allowing to reach longer distances.
The reason is that in satellite reception there are multiple working bands (4 voltage combinations - 13 V and 18 V - and tones - 0 KHz and 22 KHz -) that cannot share the same cable. The mentioned bands are: Low Vertical Band (13 V + 0 KHz), High Vertical Band (13 V + 22 KHz), Low Horizontal Band (18 V + 0 KHz), High Horizontal Band (18 V + 22 KHz). In order to select one of them, the appropriate voltage and tone have to be sent to the LNB. In a conventional installation it is up to the satellite receiver to perform this task.
When the installation has a single satellite receiver, it is the receiver itself which requests the desired band at any time and no collisions take place. Conversely, if several receivers are installed and each of them requests a different working band, the LNB will only take the higher voltage and higher tone into account. In other words, if a receiver is sending 18 V + 22 KHz (High Horizontal Band) and another one is sending 13 V + 0 KHz (Low Vertical Band), only the receiver requesting the High Horizontal Band - the highest of the requested bands - will work properly.
One solution would be to install an IF multiband amplifier like Ref. 5363. It would feed the LNB with a fixed voltage and a fixed tone so that multiple receivers could access the appropriate channels for the selected band