IP over in-ground cable applications.
Greetings, Can anyone recommend a method for integrating TCP/IP with an existing analog cable television network. The cable companies do this quite well; however, it's not immediately clear to me how I would multiplex the IP traffic and the existing video and deliver it to a home. My current thoughts on this are to digitize the satellite video into mpeg2 and deliver it over TCP/IP through the in-ground cable. This way, integrating the video and data portion are easy, however the resident would need to buy a mpeg2 set-top-box to split out the video and internet. Thank you very much for your consideration. Regards, Christopher J. Wolff, CIO Broadband Laboratories, Inc. http://www.bblabs.com
On Thu, 12 Sep 2002, Christopher J. Wolff wrote:
Greetings,
Can anyone recommend a method for integrating TCP/IP with an existing analog cable television network. The cable companies do this quite well; however, it's not immediately clear to me how I would multiplex the IP traffic and the existing video and deliver it to a home.
Ya, build a new two-way HFC network.
My current thoughts on this are to digitize the satellite video into mpeg2 and deliver it over TCP/IP through the in-ground cable. This way, integrating the video and data portion are easy, however the resident would need to buy a mpeg2 set-top-box to split out the video and internet. Thank you very much for your consideration.
The issue is you only have 125 CMTS channels to deal with and most network have way to many homes passed per head end to make mpeg2 over IP practical solution.
<> Nathan Stratton nathan at robotics.net http://www.robotics.net
Nathan, If your MPEG2 video were multicast streams, wouldn't that be a much more effective utilization of bandwidth? Regards, Christopher J. Wolff, CIO Broadband Laboratories, Inc. http://www.bblabs.com -----Original Message----- From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of Nathan Stratton Sent: Thursday, September 12, 2002 11:29 AM To: Christopher J. Wolff Cc: nanog@merit.edu Subject: Re: IP over in-ground cable applications. On Thu, 12 Sep 2002, Christopher J. Wolff wrote:
Greetings,
Can anyone recommend a method for integrating TCP/IP with an existing analog cable television network. The cable companies do this quite well; however, it's not immediately clear to me how I would multiplex the IP traffic and the existing video and deliver it to a home.
Ya, build a new two-way HFC network.
My current thoughts on this are to digitize the satellite video into mpeg2 and deliver it over TCP/IP through the in-ground cable. This way, integrating the video and data portion are easy, however the resident would need to buy a mpeg2 set-top-box to split out the video and internet. Thank you very much for your consideration.
The issue is you only have 125 CMTS channels to deal with and most network have way to many homes passed per head end to make mpeg2 over IP practical solution.
<> Nathan Stratton nathan at robotics.net http://www.robotics.net
You would need multicast speakers (routers, etc) along the cable route to effectively multiple your bandwidth at all. Since cable is already multicasting (1 stream to many/all) I don't think I see any advantage. Unless, of course, you expect cable customers to be broadcasting to other cable customers (say their own home video content)... Then MPEG2 Multicast would be your friend. Deepak
-----Original Message----- From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu]On Behalf Of Christopher J. Wolff Sent: Thursday, September 12, 2002 2:34 PM To: 'Nathan Stratton' Cc: nanog@merit.edu Subject: RE: IP over in-ground cable applications.
Nathan,
If your MPEG2 video were multicast streams, wouldn't that be a much more effective utilization of bandwidth?
Regards, Christopher J. Wolff, CIO Broadband Laboratories, Inc. http://www.bblabs.com
-----Original Message----- From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of Nathan Stratton Sent: Thursday, September 12, 2002 11:29 AM To: Christopher J. Wolff Cc: nanog@merit.edu Subject: Re: IP over in-ground cable applications.
On Thu, 12 Sep 2002, Christopher J. Wolff wrote:
Greetings,
Can anyone recommend a method for integrating TCP/IP with an existing analog cable television network. The cable companies do this quite well; however, it's not immediately clear to me how I would multiplex the IP traffic and the existing video and deliver it to a home.
Ya, build a new two-way HFC network.
My current thoughts on this are to digitize the satellite video into mpeg2 and deliver it over TCP/IP through the in-ground cable. This way, integrating the video and data portion are easy, however the resident would need to buy a mpeg2 set-top-box to split out the video and internet. Thank you very much for your consideration.
The issue is you only have 125 CMTS channels to deal with and most network have way to many homes passed per head end to make mpeg2 over IP practical solution.
<> Nathan Stratton nathan at robotics.net http://www.robotics.net
On Thu, Sep 12, 2002 at 03:04:35PM -0400, Deepak Jain mooed:
You would need multicast speakers (routers, etc) along the cable route to effectively multiple your bandwidth at all. Since cable is already multicasting (1 stream to many/all) I don't think I see any advantage.
Unless, of course, you expect cable customers to be broadcasting to other cable customers (say their own home video content)... Then MPEG2 Multicast would be your friend.
I don't think the answer is as simple as that. It really depends on the number of subscribers per last-hop multicast box, and on the number of channels you offer / popularity distribution of the channels. If you've got 5 channels and 10,000 subscribers per box, multicast saves you nothing. If you've got 1000 channels and 100 subscribers per box, ... -Dave -- work: dga@lcs.mit.edu me: dga@pobox.com MIT Laboratory for Computer Science http://www.angio.net/ I do not accept unsolicited commercial email. Do not spam me.
It is not quite clear to me what you have in mind - do you want to send exclusively IP television over the cable system, or do you want to fit IP into an existing system ? Current cable systems have separate parts of the spectrum reserved for analogue or digital television channels and the inbound and outbound IP. DOCSIS is a standard for sending data over a HFC system - see http://www.cablemodem.com/ There is lots of hardware for this from different vendors. If you want a new technology system, I would recommend multicast IP MPEG-2 over EPON - maybe in conjunction with MPLS - see http://www.iec.org/online/tutorials/epon/topic04.html If you are interested in setting up these multicasts or for content to put inside of this walled garden, please let me know :) I do not think that this is really germane to NANOG. Regards Marshall Eubanks Christopher J. Wolff wrote:
Nathan,
If your MPEG2 video were multicast streams, wouldn't that be a much more effective utilization of bandwidth?
Regards, Christopher J. Wolff, CIO Broadband Laboratories, Inc. http://www.bblabs.com
-----Original Message----- From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of Nathan Stratton Sent: Thursday, September 12, 2002 11:29 AM To: Christopher J. Wolff Cc: nanog@merit.edu Subject: Re: IP over in-ground cable applications.
On Thu, 12 Sep 2002, Christopher J. Wolff wrote:
Greetings,
Can anyone recommend a method for integrating TCP/IP with an existing analog cable television network. The cable companies do this quite well; however, it's not immediately clear to me how I would multiplex the IP traffic and the existing video and deliver it to a home.
Ya, build a new two-way HFC network.
My current thoughts on this are to digitize the satellite video into mpeg2 and deliver it over TCP/IP through the in-ground cable. This way, integrating the video and data portion are easy, however the resident would need to buy a mpeg2 set-top-box to split out the video and internet. Thank you very much for your consideration.
The issue is you only have 125 CMTS channels to deal with and most network have way to many homes passed per head end to make mpeg2 over IP practical solution.
<>
Nathan Stratton nathan at robotics.net http://www.robotics.net
-- T.M. Eubanks Multicast Technologies, Inc. 10301 Democracy Lane, Suite 410 Fairfax, Virginia 22030 Phone : 703-293-9624 Fax : 703-293-9609 e-mail : tme@multicasttech.com http://www.multicasttech.com Test your network for multicast : http://www.multicasttech.com/mt/ Status of Multicast on the Web : http://www.multicasttech.com/status/index.html
On Thu, Sep 12, 2002 at 11:24:15AM -0700, Christopher J. Wolff wrote:
The cable companies do this quite well; however, it's not immediately clear to me how I would multiplex the IP traffic and the existing video and deliver it to a home.
Well, the traditional solutions involve some combination of digital TV (which you allude to in the next paragraph) and/or frequency division multiplexing, which has existed for quite some time. Note that FDM is what makes cable TV possible to begin with. As far as the cable is concerned, there isn't much of a difference between another TV channel and data.
My current thoughts on this are to digitize the satellite video into mpeg2 and deliver it over TCP/IP through the in-ground cable. This way, integrating the video and data portion are easy, however the resident would need to buy a mpeg2 set-top-box to split out the video and internet. Thank you very much for your consideration.
I'm not sure this is really any easier than existing analog FDM techniques. --msa
"Christopher J. Wolff" wrote:
My current thoughts on this are to digitize the satellite video into mpeg2 and deliver it over TCP/IP through the in-ground cable. This way, integrating the video and data portion are easy, however the resident would need to buy a mpeg2 set-top-box to split out the video and internet. Thank you very much for your consideration.
Most satellite video is already mpeg2, why would you want to touch the bitstream? all you need is add the IP headers. Pete
participants (7)
-
Christopher J. Wolff -
David G. Andersen -
Deepak Jain -
Majdi S. Abbas -
Marshall Eubanks -
Nathan Stratton -
Petri Helenius