[79801] in North American Network Operators' Group
RE: Anyone familiar with the SBC product lingo?
daemon@ATHENA.MIT.EDU (Hannigan, Martin)
Fri Apr 15 08:04:30 2005
Date: Fri, 15 Apr 2005 08:00:14 -0400
From: "Hannigan, Martin" <hannigan@verisign.com>
To: <Michael.Dillon@radianz.com>, <nanog@merit.edu>
Errors-To: owner-nanog@merit.edu
> -----Original Message-----
> From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu]On Behalf Of
> Michael.Dillon@radianz.com
> Sent: Friday, April 15, 2005 6:34 AM
> To: nanog@merit.edu
> Subject: Re: Anyone familiar with the SBC product lingo?
>=20
>=20
>=20
> > you'll never get better redundancy than having more than=20
> one carrier.
>=20
> On the contrary, you get better redundancy by sticking to=20
> one carrier and making sure that they really provide
> separacy though the entire span of the circuit. If you
> have two carriers running fibre to yoiur building down
> the same conduit, then you do NOT have separacy and as
> a result, the redundancy is not there.
Which is the case in about 99% of the commercial buildings
providers serve. Unless you're designed as a carrier hotel
or a colo (even some colos aren't diverse entrance facility),
this is the de-facto standard. The reason why is carriers
et. al. must pay for conduit access to a building and it=20
impacts pricing, especially if you're not servicing a huge
load of service to the building. From the entrace facilities,
carriers typically also pay riser conduit fees.=20
Service delivery inside of the prem is insidiously complicated
unless you understand a little RE and how OSP is linked to
the ISP (in side plant).
>=20
> Of course, you can get separacy with two carriers but
> it is generally more work to verify that the two companies
> do not share fibre or conduit or tunnels.
Im a metro loop, they are almost certainly going to share
the same path. It is less certain that they will share a
conduit. This is standard if you have the route diversity,
which is why you want the provider diversity to make it=20
all work.=20
Hope that helps.
-M<
