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 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 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
> > > > >
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