I have a 3640 with 2 modules added providing 4 additional serial ports each. So the total number of serial ports is 10. There is one more slot available. Is there anything I would need to consider before adding another 4-port serial module? Such as memory or cpu utilization. I guess I'm asking if I max out this device using all 14 serial ports, would it overload?
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3640 limitations 2
- Thread starter ilpadrino
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I currently only have 7 of the max 14 in use for T1's. As far as CPU usage, this router is our primary router handling those 7 T1's in addition to the local network. All servers are on the loacl network. I'm measuring the CPU load at an average of 2%.
If you've got 14 T1's I'd also be looking at getting a mux'ed DS3 piped in instead of T1's.. and also I'd be looking at a more redundant router than a 3640.. You're putting too many eggs into one basket. CPU wise you look okay though..
BuckWeet
BuckWeet
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Because even though its T1 going to the remote site, the telco would MUX all of those T1's into a DS3 coming into your site and then you would demux it in the router..
Depending on the telco, it'd be cheaper for them to offer you that connection because it takes less facilities to bring you that than say 14 seperate T1's..
BuckWeet
Depending on the telco, it'd be cheaper for them to offer you that connection because it takes less facilities to bring you that than say 14 seperate T1's..
BuckWeet
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IllegalOperation
Technical User
Its called a DS3 fan-out.
As mentioned, your provider drops you a DS3 at your main site....and muxes them down to however T1's you want at each remote site. The multiplexing is taken care of by your provider on their side, so all you would see on your end is the DS3 at the main site, and the individual T1's at your remote sites.
I never heard of a provider only giving away a fractional point-to-point DS3 - so the full circuit will run you around $1,200 (approximately, give or take a few). As far as the remote site circuits cost, the provider will only charge you for the distance between your remote site and its closest CO office. That comes up to be somewhere around $150, give or take a few depending mostly on distance. Another words, depending on which provider you go with, you will start saving money after around your 7th or 8th remote site link.....
As mentioned, your provider drops you a DS3 at your main site....and muxes them down to however T1's you want at each remote site. The multiplexing is taken care of by your provider on their side, so all you would see on your end is the DS3 at the main site, and the individual T1's at your remote sites.
I never heard of a provider only giving away a fractional point-to-point DS3 - so the full circuit will run you around $1,200 (approximately, give or take a few). As far as the remote site circuits cost, the provider will only charge you for the distance between your remote site and its closest CO office. That comes up to be somewhere around $150, give or take a few depending mostly on distance. Another words, depending on which provider you go with, you will start saving money after around your 7th or 8th remote site link.....
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IllegalOperation
Technical User
Yes, I believe the most common termination is with a HSSI card/adapter....
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IllegalOperation
Technical User
"When you talk about "fan-out", is this similar to fractionalizing a T-1?"
In a way, yes. There shouldnt be any fractionalizing at all when it comes to point-to-point circuits, however. There really are no fractional point-to-point DS3's or a fractional point-to-point DS1's if an ISP is smart. They would just be wasting bandwidth then. However, your main DS3 at your main site will be muxed down to FULL DS1's for each remote sites. In other words, you cant tell your provider to give you a 256K link at a remote site if you are using a DS3 fan out. It will be the full 1.544Mbps. If you need more bandwidth at a remote site, you cant ask them to "fractionalize" your DS3 for that site. What they will do is just add more FULL DS1's to the remote site as you need them. So instead of having a 3Mbps fractional DS3 at your remote site, you will get two DS1's. With the DS3 fan out, you will have a total of 28 DS1's to use for your remote sites....distributed however you like (you dont have to use them all).
"Can you get a DS3 and fan-out to remote offices as well as receive internet from the ISP?"
No. It is strictly point-to-point. You will need a seperate circuit for that, which is known in the ISP world as the DIA....
In a way, yes. There shouldnt be any fractionalizing at all when it comes to point-to-point circuits, however. There really are no fractional point-to-point DS3's or a fractional point-to-point DS1's if an ISP is smart. They would just be wasting bandwidth then. However, your main DS3 at your main site will be muxed down to FULL DS1's for each remote sites. In other words, you cant tell your provider to give you a 256K link at a remote site if you are using a DS3 fan out. It will be the full 1.544Mbps. If you need more bandwidth at a remote site, you cant ask them to "fractionalize" your DS3 for that site. What they will do is just add more FULL DS1's to the remote site as you need them. So instead of having a 3Mbps fractional DS3 at your remote site, you will get two DS1's. With the DS3 fan out, you will have a total of 28 DS1's to use for your remote sites....distributed however you like (you dont have to use them all).
"Can you get a DS3 and fan-out to remote offices as well as receive internet from the ISP?"
No. It is strictly point-to-point. You will need a seperate circuit for that, which is known in the ISP world as the DIA....
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This is usually called a channelized DS-3 in the Telco world. Every channelized DS1 is made up of 24 timeslots called DS0's. A channelized DS3 is made up of channelized DS1 which can be muxed down to an individual DS0. This continues in the Sonet world like OC3. I dont remmeber off the top of my head how many DS1 are in a DS3 or DS0. Sorry.
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