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VSAT technology and installation >> iDirect Forum: hubs and terminals >> Decreasing Power of a RxTX Line Card
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Message started by samiraaaa on Oct 12th, 2011 at 8:41am

Title: Decreasing Power of a RxTX Line Card
Post by samiraaaa on Oct 12th, 2011 at 8:41am
Hi,
Could you please let me know how I can decrease the power of a Downstream Carrier (TX HLC) in iBuilder. It can be increased, but no decreased.
please let me know if it dependents on other parameters...

Title: Re: Decreasing Power of a RxTX Line Card
Post by vsat_new on Oct 12th, 2011 at 9:36am
Hi Hana,

Have you tried to telnet the HLC card and the you can decrease/increase the power from there

regards.

Title: Re: Decreasing Power of a RxTX Line Card
Post by Hana on Oct 12th, 2011 at 9:47am
hi, thnx for reply,

yes, I know I can change it by telnet. But when HLC is resetting, it starts with the power which set in HLC Config in iBuilder. I want to change this initial power.
For example, tx power in its config is -35, I want to change it to -38 forever.

Title: Re: Decreasing Power of a RxTX Line Card
Post by vsat_new on Oct 12th, 2011 at 10:04am
Hi Hana,

the minimum power on HLC card is -35dBm.
You cannot decrease anymore. If you want to reduce your carrier, you can put 3 dB attenuator in your TX chain.

thanks.

Title: Re: Decreasing Power of a RxTX Line Card
Post by Hana on Oct 12th, 2011 at 10:08am
Hi Dear,

How can I put 3 dB attenuator in my TX chain?

Title: Re: Decreasing Power of a RxTX Line Card
Post by vsat_new on Oct 12th, 2011 at 10:18am
put it in the TX port of your Idirect Chassis

Title: Re: Decreasing Power of a RxTX Line Card
Post by Hana on Oct 12th, 2011 at 10:34am
please guide me exactly to put the number in TX port. I cann't find it...

Title: Re: Decreasing Power of a RxTX Line Card
Post by vsat_new on Oct 12th, 2011 at 10:51am
actually i dont know also, which port you keep M1D1  card.

i just sent my YM ID to your inbox, please add me and i will help u if i can


thanks.

Title: Re: Decreasing Power of a RxTX Line Card
Post by Hana on Oct 12th, 2011 at 11:48am
I talked to iDirect Support,
They told that -35 is the minimum value and can not save a number larger than it as initial power, as you mentioned.
For increasing the tx power after resetting, it should be done via telnet.
thanks a lot for your help.

Title: Re: Decreasing Power of a RxTX Line Card
Post by husker on Dec 4th, 2011 at 1:56pm
Physically pad the tx cable with a few db of attenuation. Then call you sat controller to re-commision your carrier so you can provide sufficent outbound carrier for your customers. Also sometimes when you do this you will find your outbound runs more efficently.

V/R

Title: Re: Decreasing Power of a RxTX Line Card
Post by Eric Johnston on Dec 4th, 2011 at 6:58pm

wrote on Oct 12th, 2011 at 10:04am:
Hi Hana,

the minimum power on HLC card is -35dBm.
You cannot decrease anymore. If you want to reduce your carrier, you can put 3 dB attenuator in your TX chain.

thanks.


I would suggest a 10 or 15 dB in-line pad. Then adjust the HLC line card up by 7 or 12 dB.

Modems and line cards all operate best when power levels are not near either extreme low or extreme high levels. This also gives you scope for wider in-service adjustments.

In large dish earth stations or ones with very high power amplifiers it is also a lot safer to have fixed attenuators on the inputs to amplifiers in the transmit chain so that modems operate near, but not at, the upper end of their output range. This minimises the effect of a modem being accidentally configured to maximum output and otherwise saturating the satellite transponder.

Best regards, Eric.

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