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1  VSAT technology and installation / iDirect Forum: hubs and terminals / Re: iDirect PP Blade
 on: Aug 6th, 2018 at 8:05pm 
Started by hamoz13 | Post by Admin1  
I am not expert on this but here some guesses / thoughts.

60 Mbits upstream traffic.

Set your remote uplink bit rate according to remote BUC power, remote dish size and link budget. Example 5 Mbit/s

Make some assumption about uplink TDMA efficiency. Say 50%

You need 24 TDMA receivers at the hub and  24 frequency slots, each good for a 5 MBit TDMA carrier.

I would think in terms of one transponder for one big 85 Mbit download carrier operated close to but not at saturation, plus another transponder for all the return link carriers, operating backed off for multi carrier operation, perhaps with higher gain step setting.

I suggest you contact iDirect for their advice.

Read here: http://www.idirect.net/Network-Design-Class-Listing.aspx



2  Service Providers / TooWay and KA-SAT satellite / Re: Cable attenuation problems?
 on: Aug 6th, 2018 at 7:41pm 
Started by correze19 | Post by Admin1  
Observe the screen display of cable ohms resistance and dB attenuation while waggling the coax cable connectors in an attempt to identify where is the poor connection. I would expect both ohms resistance and dB attenuation to jump about together if there is a bad connection.

The fault could be at either end or at both ends!!

The F type centre pin should be about 1.5 mm proud of the rim. The outer foil sheath and braid wires must make good contact also. Beware that the centre pin must go in smoothly and not 'push back' as the outer is screwed in.

If moisture has got into the outdoor end then 8 weeks is plenty of time for severe corrosion to have set in. The combination of DC power current and moisture can make the pin burn away and the foil sheath to turn to dust.

Further thought. Coax cable must be bent gradually. If bent at a very sharp angle the foil sheath inside can crack across. Since the radio signal goes via the foil sheath and the DC current via the braid wires you might see dB attenuation variations only.

3  Service Providers / TooWay and KA-SAT satellite / Cable attenuation problems?
 on: Aug 6th, 2018 at 2:28pm 
Started by correze19 | Post by correze19  
Hi, Wonder if anyone can help. About 8 weeks ago we installed a new satellite kit and the first few days it worked great.
Since then we have had endless problems with the internet being really slow. Everything seems at the correct levels except the cable attenuation. It jumps from around 4.db up to 15.db constantly. I presume it should stay at roughly one level? I have seen that it is advised to have the coaxial just right and I have changed that on the modem end carefully 3 times now -makes no difference Embarrassed  The cable is new, it came with the kit and the coaxial came fitted for the Tria end, which looks ok as well.
Really not sure what to do now. Any advice would be great thanks as I seem to spend more time trying to sort this out than anything!!

4  VSAT technology and installation / iDirect Forum: hubs and terminals / iDirect PP Blade
 on: Aug 4th, 2018 at 11:10am 
Started by hamoz13 | Post by hamoz13  
Does any one have an idea about how many PP Blades (Dell Power-edge R610)  do I need for an iDirect network with 300 remotes, about 85 Mbps downstream traffic and about 60 Mbps upstream traffic?

Best Regards,
Hrq

5  Service Providers / TooWay and KA-SAT satellite / Re: Low RX SNR
 on: Aug 1st, 2018 at 2:33pm 
Started by SandFish | Post by Admin1  
Perhaps a case of "If it works, don't fix it" !

I think there are four downlink carriers to customers per beam.
.  It is normal the carrier levels and C/N to vary due to rain and other factors at the uplink gateway site.
.  During any level degradation event at either the gateway or individual customer site the system incorporates automatic adaptive compensation to maintain the service. For example, a customer might, in clear sky, receive 20 Mbit in one second, made up of stream of short bursts each at 125 Mbit/s, the gaps in the whole second being filled with traffic for other customers. During rain the 20 Mbit in one whole second can be achieved by using more rugged bursts at say 62.5 Mbit/s, but still leaving gaps in the whole second for other customers. This variable burst bit rate is called adaptive modulation and coding, using MODCODs varying from highly efficient but delicate 8PSK 0.8FEC to very rugged QPSK 0.5FEC.  If a site is at beam edge or mispointed it is relatively degraded but the customer will notice no difference as it makes no difference to the end to end 20 Mbit per whole second. Similarly a site at beam centre with good pointing gets the highest feasible burst bit rate, but still gets 20 Mbits total per second leaving more time for other customers.

Tech note: The 'bursts' referred to above are actually different MODCOD frames within the DVB-S2 carrier frame structure. The carrier has a constant symbols per second rate. The outlink download carriers to the customers are continuous, not TDMA.

A typical DVB-S2 carrier has a constant symbol rate and a structure made up a blocks of different bit rates and modulation/coding types, say 64, 50 and 21 Mbit/s, and the proportion of each type, say 0.95 8PSK, 3/4 8PSK, 1/2 QPSK, will depend on the distribution of types of weather across the beam coverage.

Tooway : My guess as to how it works !

6  Service Providers / TooWay and KA-SAT satellite / Re: Low RX SNR
 on: Aug 1st, 2018 at 9:26am 
Started by SandFish | Post by SandFish  
Hi Eric,  Thanks for your detailed response.  I think I've been abandoned by the company so will be sorting this myself!  On the subject of the beam, I also do not understand the drop, nor why I can't, with careful adjustment, get it up.  However since last week AND not having touched the dish, today it is up to and steady at 11.2dB, so there is something going on that I can't understand.  The dish is solid and does not move.  It is high summer, with a daily max of 35C.  I even wondered if it was due to metal expansion?

As for the earth cable, I also have never seen that kind of failure.  The dish was installed by a company installer.  When he put it up, on the gable end of a stone building, I asked about the earth, and the need to connect it to "Ground" but he said it wasn't necessary.

Yes, we get a lot of thunderstorms, but have had no nearby strikes.  The dish is below the roof top and well below the mains electricity pole on the end of the house, which does have ground protection.  So while the TRIA is (or was) bonded to the dish frame, the frame is just bolted to the wall, without any further bonding.  The rubber sleeve/heat shrink is still in place at both ends |(moisture ingress protection?) and the damage is limited to the vertical wire run close to the frame.  It almost looks as though it has been eaten?

As the coax is in its own, separate conduit from the outside wall to the internet distribution box in the hall, where the satellite modem is, I'm not sure how main current would get into the sheathing?  I think I need to check the coax at the TRIA when I do the replacement work.

I haven't touched the earth, as I am aware of the potential for it to carry current, and will turn the system off and unplug, as you suggest before replacing it.  The danger is magnified when you are at the top of a ladder!! Kiss

I don't have a PME.  This is southern Europe, where there is no earth on the incoming power, instead every property has it's own, sometimes, with mine, the earth from the consumer unit goes via the meter box to the underground steel rising water main.

Norman

7  Service Providers / TooWay and KA-SAT satellite / Re: Low RX SNR
 on: Jul 30th, 2018 at 10:48am 
Started by SandFish | Post by Admin1  
I can't think of good idea why the RX SNR has gone a bit low. If you are the middle of a beam you should stay in that beam.  If you are where beams overlap it is possible that your tuning and polarisation might jump from one beam to another and so give different readings.

The damage to the earth cable is interesting.  It looks as though the copper cores have disappeared.  Have you had any thunderstorms ? There may have been severe corrosion caused by moisture aggravated by steady long term electric current flow.

There should be no current flow in the earth wire. But there is, sometimes, due to 1) poor connection of the coax (The DC supply current to the LNB/BUC then goes via the earth wire rather than the coax sheath)  2) due to mains current from the house going via coax sheath rather than the house earth/neutral.

The earth wire provides some protection against electric shock and fire in the house if you have lightning strike and is a legal requirement in some places.

If you have earth wire and metal pole into real ground then the outdoor end is truly earthed. An electrician should be consulted if you have have 'PME' system.   The coax cable from outdoor to indoors can provide a connection between the house earth or neutral mains connection and the real earth.  Here there is hazard in some places. The house neutral or earth wiring may be floating at some voltage above the true ground outside and the coax provides a true current path to ground.   

There is a real hazard if a house or block of flats develops a an open circuit neutral fault as the entire house domestic mains supply current then flows to ground via your earth cable.

If I was replacing your earth cable I would first unplug the indoor equipment completely from the mains sockets.

I never hold the outdoor end of a coax until I have measured the voltage between the end of the coax and the local ground! Should be zero AC and DC.  Take care.

Best regards, Eric

8  Service Providers / TooWay and KA-SAT satellite / Low RX SNR
 on: Jul 28th, 2018 at 10:19am 
Started by SandFish | Post by SandFish  
I'm having trouble peaking up my Tooway system.  My reseller is unresponsive to emails and phone calls, so I'm on my own.

I'm on an island in the Adriatic, in the centre of Blue 1.  From installation I've had a maximum of 13.5dB, but recently this has dropped.  I did a re swing of the dish and the best I can now receive is 10.5dB.

I found when I was up the ladder the the earth lead has disintegrated in the high UV here.  Can that cause TRIA problems?

There are lots of mention of Peaking up but no descriptions of how to do it.  I don't have a meter, so use the TRIA tones with a portable wifi device showing the INSTALL page readings to help and very small changes to the bolts, but still can't get above 10.5.

I don't know why the RX SNR has changed.  Any advice would be appreciated.

9  VSAT technology and installation / iDirect Forum: hubs and terminals / Re: Why are Direct X1 LEDs flashing ?
 on: Jul 26th, 2018 at 5:48pm 
Started by Admin1 | Post by Gigi  
Thank you

Helpfull.

I will tell you !

10  VSAT technology and installation / Hub and VSAT satellite equipment for sale and wanted / Re: 5W BUC AVAILABLE AT THE BEST PRICE
 on: Jul 19th, 2018 at 7:56am 
Started by Raji Israel | Post by Raji Israel  
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