SatSig topic:

iSCPC network configuration

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May 28^th, 2009 at 10:38am

Hi,

Understand that iDirect can set a iSCPC link and I want to install a remote-to-remote iSCPC link.

Questions:

1) Can this iSCPC link between 2 remotes iDirect modem directly w/o going thr' iSCPC Line Card?

2) Do i still need a iSCPC Line Card?

Best Regards,

May 28^th, 2009 at 12:10pm

Someone with a little more experience with iDirect iSCPC should probably confirm this, but I am pretty sure that iDirect has always been capable of terminating iSCPC links - remote to remote. Only recently (7 or 8.x) iDirect modified their software iDS to terminate to the Line card. I would recommend checking with iDirect (TAC) just to make sure what I am putting out is accurate but I am pretty certain that is the case.

Anyone out there running iSCPC? If so, please enlighten us on how you are doing business.

Jun 8^th, 2009 at 3:29pm

You can run iSCPC between two 5000 series satellite routers (but not the 3100s). You don't need an iSCPC card or a hub for that matter. You do need to make sure you download and install the iSCPC software on the remotes. There is also an installation guide available form the iDirect TAC.

Jun 9^th, 2009 at 2:07am

most of the iSCPC's circuits we have done are using verions 8.0.2.5. Just make sure that you have 2 modems that have the iSCPC software installed in them.
Also make sure that you make the frame sizes the same on both ends.

Jul 10^th, 2009 at 4:24pm

The 5100 is a great iSCPC modem/router since it has all the "stuff" built in that you need to run a good IP circuit - routing, TCP/HTTP Acceleration, QoS, etc. However it's important to understand that it has limited throughput capabilities. It is not a replacement for Comtech, Paradise or similar SCPC modems for larger circuits.

The 5100 is advertised as supporting something like 20 x 6.5 Mbps, but this kind of throughput is only possible with maximum sized packets (1500 bytes). Very few sites, if any, transmit everything in 1500 byte packets.

With current software, the forwarding rates are about 2300 PPS (packets per second). VoIP, like some other traffic, uses minimum sized (64 byte) packets. 2300 PPS x 64 bytes x 8 bits = 1.177 Mbps total throughput - so you could support a 588 x 588 Kbps circuit if all the packets are minimum sized packets.

Since most traffic is a combination of large and small packets, a reasonable application for the 5100 is perhaps 2 - 5 Mbps divided between download and upload. The more VoIP channels there are, the less the amount of bandwidth available for data. 18 - 23 VoIP lines (G.729 codec) is the most you can do, with nothing left over for data, so don't use a 5100 iSCPC solution to terminate E1's worth of VoIP. It won't work unless you're using some kind of packet aggregation appliances to combine lots of small packets into fewer large packets.

For smaller SCPC circuits, you can't beat the 5100 solution, but you have to really make sure you understand the traffic to make sure the 5100 supports it - otherwise you end up with lots of dropped packets and you pay for bandwidth you can't use.

By the way, the limitation is a result of the VLAN feature built into the iDirect solution. If the VLAN feature was removed, the throughput could be significantly increased. Hopefully iDirect will give us a high performance version some day.

Pat

Business Satellite Solutions, LLC
www.bsatellite.com

Nov 17^th, 2009 at 12:42pm

even though it is an old issue but i do not understand why people keep trying to use idirect modems for their SCPC links? they are plenty of other SCPC modems in the market much cheaper than iDirect 5000 series but at the same time they can provide even wider range of facilities than iDirect 5000 can do.

Nov 17^th, 2009 at 3:10pm

Cant argue with that...unless they wanted to terminate that iSCPC link to a Line Card on their hub.

Nov 23^rd, 2009 at 7:34pm

I do not think the 5000 iSCPC is that bad idea.
The 5000 has TCP acceleration, QoS, built-in switch and more.

Nov 24^th, 2009 at 12:53am

I don't know of any SCPC modem cheaper than i5100 that has an IP router and QoS built in, has no IP interoperability issues and supports 8PSK and TPC.

Nov 30^th, 2009 at 2:00pm

I think there is but as i don't want to advertise for anyone here, if you are interested please email me on sinsatellite@gmail.com so I can guide you through this. there is at least one other SCPC modem in that has embedded router, support 8PSK and TPC and even cheaper than iDirect 5000.

Dec 3^rd, 2009 at 11:09pm

You have to look at the space segement also.

The modem is cheaper than most yes and comes with a in built router but does not come with all the MODCOD options other SCPC modems have.

Some other modems may be able to save you money monthly on space segment costs that may outweight the costs of a more expensive modem, router and switch for example.

Best to look at all options available.

ScotlandTDMA

Dec 8^th, 2009 at 1:29pm

Hi all ! I just bought two pices of INFINITY 5100 and I want to run them in iSCPC mode. Can somebody provide software updates because I don't have acces to TAC suport. Is TAC support free and if is can somebody tell me how to register... My modems are not bought directly from iDirect and maybe this will be a problem with the support.
Thanks in advice !!!!

Dec 8^th, 2009 at 3:15pm

Quote:

Hi all ! I just bought two pices of INFINITY 5100 and I want to run them in iSCPC mode. Can somebody provide software updates because I don't have acces to TAC suport. Is TAC support free and if is can somebody tell me how to register... My modems are not bought directly from iDirect and maybe this will be a problem with the support.
Thanks in advice !!!!

Hi TG,
you will have to go to your retailer for the SW, iDirect support access is not free, and iDirect do not enter in to support agreements with individuals or end user companies. iDirect will support the reseller, or service provider. I don't know where you purchased the modems from, but if it was a reseller of iDirect, they should be able to give you the required SW, both the operate on the modems and assist you in configuring the modems also.
I would recommend approaching the person who sold the units to you.
when you bought the units, did you specify the use? what SW has already been loaded on the units? what SW were you given when you purchased the units?
idirect modems are not simple plug and play devices, they have pretty complex configurations and it needs to be understood exactly how to build them, but then you get what is in my opinion a second to none system.
You can always contact iDirect TAC, they will ask you to verify where the units are from and I hope assist you in understanding who to approach to assist in the configuration. you can email them, or call. the details are on their website. never hurts to call and ask, at least tell them you bought the units and would like to understand how to get help configuring them. they may point you in the right direction.

Dec 11^th, 2009 at 1:21pm

Thanks a lot Scout for the info. Last day i had some time to play with my configuration files. Once with iSite once on hand with the console. I made some changes but I can't understand are they real !!! In TX configuration I had changed the symbol rate, the mod and fec types some times(just to try if it works) but on the output I aways have the same result. I have no errors messages when the falcon_idirect service starts but still have no different results!!
Any help will be good for me.....