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Dear All,
Thanks for your help, ideas, suggestions, etc.
We are using SDM-300 Sat modems with a UB-530 interface board. This has an EI-530 interface which can be wired to V.35 standards. We have our core routers at the SES (only < .5 mtr away) and using Ethernet take it to the distribution/access network where one is 500mtrs and another is 2km. We keep the internet traffic on a separate VLAN to distribute it. This way you need not have to run it into a Mux or converter... Saves you money.
We use the same setup at the moment (with 3/2 down/up) but I was wondering if we could increase the length of the V.35 link so we can move the router to our computer room from the earth station for ease of maintenance, etc.
I look through the blackbox site and they had converters, extenders, etc but with max of 2mbps.
Regards
Our link is presently configured to work at 3M down and 1M up. I know that V.35 can go up to 5Mbps after that we will shift to HSSI or Ethernet interface on the sat modems.
Alex
-----Original Message----- From: pacnog-bounces@pacnog.org [mailto:pacnog-bounces@pacnog.org] On Behalf Of Philip Smith Sent: Thursday, 18 May 2006 2:52 a.m. To: Mr. Siumafua Moala Cc: PacNOG Subject: Re: [pacnog] Router & Sattelite modem connection
Hi,
Mr. Siumafua Moala said the following on 17/5/06 12:52:
We just finish upgrading one of our internet link and have to move our router to the earth station so that we can connect it to the sat. modem v.35 port. Before the modem was connected via coax to a DXC (convert from coax to v.35) and then to the router in our computer room. The problem with the DXC is that its limited to 2mbps link.
I am wondering how we can extend our connection so that we can move our router back to our computer room for easier maintenance, etc.
Short of upgrading your DXC to support speeds above 2Mbps, the only other options would be to have a small router used as "media" convertor at the earth-station (V.35 one side, ethernet the other), connecting to your main router back at the office by ethernet (up to 100 metres) or by fibre. What speed are you trying to support?
Or get some device that will extend >2Mbps circuit over fibre... I started browsing through RAD's website, and maybe something like http://www.rad-direct.com/Application-t3-extender-fiber.htm could work. This particular one won't as it only supports T3s.
Sorry, I don't have much idea otherwise... :-( Upgrading the DXC seems easiest if you can't leave the router at the earth-station.
philip
pacnog mailing list pacnog@pacnog.org http://mailman.apnic.net/mailman/listinfo/pacnog
On 18-May-2006, at 17:23, Mr. Siumafua Moala wrote:
Thanks for your help, ideas, suggestions, etc.
We are using SDM-300 Sat modems with a UB-530 interface board. This has an EI-530 interface which can be wired to V.35 standards. We have our core routers at the SES (only < .5 mtr away) and using Ethernet take it to the distribution/access network where one is 500mtrs and another is 2km. We keep the internet traffic on a separate VLAN to distribute it. This way you need not have to run it into a Mux or converter... Saves you money.
We use the same setup at the moment (with 3/2 down/up) but I was wondering if we could increase the length of the V.35 link so we can move the router to our computer room from the earth station for ease of maintenance, etc.
I look through the blackbox site and they had converters, extenders, etc but with max of 2mbps.
About eight years ago, before southern cross was lit and as the Internet in New Zealand was having one of its little growth spurts, we landed a 10Mbit/s carrier from Intelsat 177E to an earthstation in Carlaw Park in Auckland. The uplink was from Steel Valley in California, which was operated by Vyvx.
I just found one of the test traces we ran, as we were testing the carrier.
http://www.patho.gen.nz/~jabley/pix/cn_beg.gif
We used an SDM-2020 modulator in California and the corresponding demod in Auckland, each of which presented HSSI interfaces to a cisco router (a 7204 and a 7505, respectively). Since this was a unidirectional US -> NZ link we had to mangle some $150 cisco cables and loop various conductors within them to convince the routers in each site that the interfaces were actually up.
We would have liked to avoid putting what (at the time) were expensive routers in the earthstations, but we had great trouble finding a good alternative: we couldn't extend them using sync telco circuits because we kept running into sync/clocking issues: it was (fairly obviously) next to impossible to arrange for the achieved signal rate over the bird to match any of the available transmission rates of any DSU we could buy.
When it came to troubleshooting transmission problems through either earthstation, it was very handy to have a local router there to diagnose problems. The more boxes there are between your antenna and your router, the harder it is to know whether you need to be talking to the uplink operator, the satellite operator, the earthstation operator or the person providing transmission from the earthstation back to your main site. Unless you have good, hard evidence as to what is going on, they will all just keep pointing fingers at each other and whistling, innocently.
So, I would say that having routers close to your antennas is a good idea.
Joe