Re: Cable Multiservice Operators [7:5246]
Inline - Original Message - From: Curtis A. Rose To: Donald B Johnson jr ; Sent: Thursday, May 24, 2001 10:24 AM Subject: Re: Cable Multiservice Operators [7:5246] It appears he is suggesting OPEN ACCESS agreement whereas the customer is allowed to choose which company they want to get their news, email, and service from. Currently which MSO is implementing this. The CMTS belongs to whichever cable company installed it. If they are utilizing Cisco GSRs and UBRs, they will most likely be using MPLS and VPN to accomplish this. I would check to see what the downstream and upstream are running. Big difference between QPSK, QAM 16 and QAM 64. Yeah, Cisco has to put a router in everything, but they forgot the up-converter:), still I took it that he meant doing VPNs on the RF network, not to my knowledge. Could you explain. Since DOCSIS is an end-to-end IP solution you can do anything with the data coming out the NSI. Does the UBR do 256QAM. They will not be overbuilding the CMTS to accomplish this. You Bet!!! Actually wouldn't it be the plant, anyway. The service company brings in their connection to the HeadEnd (OC3, OC12 whatever). Seems to me that they want to provide an end-to-end solution over a cable network, else why would they care about renting a frequency range. If the Cable Operator dumps data out the NSI of a CMTS then this ISP wouldn't need any Frequency If your company wants to overbuilding the CMTS you are talking about alot of work and money. I do not know what cable company you are dealing with but I doubt they would just give away channels as they lose revenue with TV when doing so. You are taking a channel away both in the upstream and downstream. In a sub-split systen there are no channels in the upstream, I believe the first channel, channel 2 is 54.25 MHz, in a standard plant and 52.25 in a (HRC plant, not many of those left), the North American DOCSIS standard goes to 42 MHz should be plenty of room for a upstream carrier. You are right though they are not going to give away bandwidth. Up and down you'll be charged. The billing will be the service provider's issues. The cable company will charge for the bandwidth utilized. (depending upon the agreement). As this is a shared network, I would check the numbers of homespassed per node. This can range from 75 to 3000. Cablelabs recommends 500 homes passed per node. I would also check the number of subscribers per Blade card on the UBR. Cisco recommends not to exceed 1000 customers per blade. The cablemodem receives the permission to come on line from a LDAP server and usually uses a 10.X.X.X IP address and the customer will receive an IP from the Whom The cable company or the service provider? This as well needs to be reviewed. I know that cable companies are striving to achieve QOS but right now it is best effort. In your readings I would recommend Michael Adams book OpenCable Architecture from CiscoPress. There is also the DOCSIS spec available on Cablelabs page. A definite for anyone running DOCSIS. I would also look at the Service Level Agreement with the cable company you are dealing with. It is amazing what happens when they change the cable plant around and not tell you what they are doing. I hope this helps. Curtis - Original Message - From: Donald B Johnson jr To: Sent: Wednesday, May 23, 2001 9:23 AM Subject: Re: Cable Multiservice Operators [7:5246] Couple of questions; Do you want to run DOCSIS? What do you mean the cable infrastructure is Cisco? Aren't you going to provide your own gear. Then you can combine/split the signal at the headend. What do you mean they are going to sell you a frequency range? You should have only one DOCSIS downstream QAM per physical plant, hence only one frequency is needed not a range. It should be a standard 6 MHz ntsc channel. Start at 555 MHz and count 6 MHz either way and these are your center frequencies. EX 549, 555, 561, 567 etc... Or if you are not in North America you probally run an 8 MHz carrier. Never worked with Euro-DOCSIS, but it aint much different. You will also need a frequency for the upstream somewhere between 5 and 42 MHz, look for something 30 MHz and above. This will give you the friendliest environment for running the wide-boy 3.2 Mhz in the upstream. DOCSIS is a shared medium, this PVC MPLS-VPN you are talking about are ATM technologies (I Think) you can't run them on a DOCSIS network, security is provided through BPI or BPI+. Physical seperation means a separate cable plant, a cable company is not going to overbuild on themself just to provide DOCSIS which runs on one of many frequencies. Can't do guaranteed service or QOS until DOCSIS 1.1. I would check into that first and make sure all your gear is 1.1 compliant or else no QOS or BPI+. If you want give me a call if I haven't answered your questions fully. We will be offering
Re: Cable Multiservice Operators [7:5246]
It appears he is suggesting OPEN ACCESS agreement whereas the customer is allowed to choose which company they want to get their news, email, and service from. The CMTS belongs to whichever cable company installed it. If they are utilizing Cisco GSRs and UBRs, they will most likely be using MPLS and VPN to accomplish this. I would check to see what the downstream and upstream are running. Big difference between QPSK, QAM 16 and QAM 64. They will not be overbuilding the CMTS to accomplish this. The service company brings in their connection to the HeadEnd (OC3, OC12 whatever). If your company wants to overbuilding the CMTS you are talking about alot of work and money. I do not know what cable company you are dealing with but I doubt they would just give away channels as they lose revenue with TV when doing so. You are taking a channel away both in the upstream and downstream. The billing will be the service provider's issues. The cable company will charge for the bandwidth utilized. (depending upon the agreement). As this is a shared network, I would check the numbers of homespassed per node. This can range from 75 to 3000. Cablelabs recommends 500 homes passed per node. I would also check the number of subscribers per Blade card on the UBR. Cisco recommends not to exceed 1000 customers per blade. The cablemodem receives the permission to come on line from a LDAP server and usually uses a 10.X.X.X IP address and the customer will receive an IP from the Whom The cable company or the service provider? This as well needs to be reviewed. I know that cable companies are striving to achieve QOS but right now it is best effort. In your readings I would recommend Michael Adams book OpenCable Architecture from CiscoPress. I would also look at the Service Level Agreement with the cable company you are dealing with. It is amazing what happens when they change the cable plant around and not tell you what they are doing. I hope this helps. Curtis - Original Message - From: Donald B Johnson jr To: Sent: Wednesday, May 23, 2001 9:23 AM Subject: Re: Cable Multiservice Operators [7:5246] Couple of questions; Do you want to run DOCSIS? What do you mean the cable infrastructure is Cisco? Aren't you going to provide your own gear. Then you can combine/split the signal at the headend. What do you mean they are going to sell you a frequency range? You should have only one DOCSIS downstream QAM per physical plant, hence only one frequency is needed not a range. It should be a standard 6 MHz ntsc channel. Start at 555 MHz and count 6 MHz either way and these are your center frequencies. EX 549, 555, 561, 567 etc... Or if you are not in North America you probally run an 8 MHz carrier. Never worked with Euro-DOCSIS, but it aint much different. You will also need a frequency for the upstream somewhere between 5 and 42 MHz, look for something 30 MHz and above. This will give you the friendliest environment for running the wide-boy 3.2 Mhz in the upstream. DOCSIS is a shared medium, this PVC MPLS-VPN you are talking about are ATM technologies (I Think) you can't run them on a DOCSIS network, security is provided through BPI or BPI+. Physical seperation means a separate cable plant, a cable company is not going to overbuild on themself just to provide DOCSIS which runs on one of many frequencies. Can't do guaranteed service or QOS until DOCSIS 1.1. I would check into that first and make sure all your gear is 1.1 compliant or else no QOS or BPI+. If you want give me a call if I haven't answered your questions fully. We will be offering voice soon on our DOCSIS networks, also. Don - Original Message - From: Alec Smiths To: Donald B Johnson jr Sent: Tuesday, May 22, 2001 11:34 PM Subject: Re: Cable Multiservice Operators [7:5246] Hi Don, We have a CATV partner. We will begin to give cable internet services very soon. I want to ask about logical and physical seperation issues. My company wants to rent a frequency range from CATV operator, so we will be able to operate on that freq. range. We want to control our own customers. We want to give guaranteed bandwidth. We try to find a way that they shouldn't sell the same frequency range lots of ISPs. We don't care about the extra investments, we have enough budget. Cable Internet infrastructure is totally Cisco. I read a document from Cisco and it says some tradeoffs about physical seperation. But they do not say technically impossible, they just say it's not recommended. I want to know what are the real difficulties about physical seperation, instead of having a PVC or MPLS VPN through CMTS network. --- Donald B Johnson jr wrote: Yeah what do you want to know. I work for an MSO running DOCSIS. Don - Original Message - From: Alec Smiths To: Sent: Monday, May 21, 2001 7:01 AM Subject: Cable Multiservice Operators [7:5246] Hi
Cable Multiservice Operators [7:5246]
Hi group, I need to speak with a networker who has cable operator experience. My company (ISP) will become a partner with a CATV operator and will begin to give data services over CATV network. But I have some questions to discuss with group members who are experienced about this type of network. please reply if you have something to say about Cable Multiservice Operations. Cheers, Alec __ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=5246t=5246 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
