[164415] in North American Network Operators' Group
Re: Typical link speeds between COs
daemon@ATHENA.MIT.EDU (Jared Mauch)
Thu Jul 11 15:26:27 2013
From: Jared Mauch <jared@puck.nether.net>
In-Reply-To: <51DEFC08.1020609@vaxination.ca>
Date: Thu, 11 Jul 2013 15:25:54 -0400
To: Jean-Francois Mezei <jfmezei_nanog@vaxination.ca>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Jul 11, 2013, at 2:40 PM, Jean-Francois Mezei =
<jfmezei_nanog@vaxination.ca> wrote:
> What are the typical speeds used on fibre links between COs in North
> American and elsewhere ?
So, with a single pair of fiber, you can easily purchase a system =
(including amps) to do 40x10G.
How far you it reaches all depends on the equipment you use.
> I realise that there are special cases, such as Shaw using WDM to =
reach
> 400gigabits/sec in a link in Western Canada. But what are the most
> common speeds ?
Most common increment these days is OTU2 or ~10G client side. You can =
get 100G solutions from vendors as well.
> Is WDM in common use to multiplex multiple 10gbps, 40gbps links ? Or =
is
> that used mostly for intercity trunks and intra-city trunks tend to =
not
> bother with WDM because of ample supply of fibre ?
Much of this depends on the existing services on a path, what's in-use, =
etc.
> Do telcos typically quickly upgrade fibre strands to newer speeds, or
> are there still many strands handling only 100mbps or 1gbps between =
COs
> because telcos never got around to upgrading legacy equipment/services
> (such as ATM etc) ?
I'm sure there are plenty of legacy services out there. I've seen =
pricing of ethernet-over-copper services for 5-10megs that are the same =
as existing T1 pricing. Carriers like to move away from the T1/DS1/DS3 =
business as it's lower cost and typically unregulated.
> Also in terms of costing WDM, would one typically have a card that has
> the multiple colours in the card and outputs a single multi-colour
> signal or would one typically have separate cards for each colour and
> then use a WDM "filter" to combine/separate colours onto the single =
strand ?
This depends on many things. I've seen people doing all variants of =
this, and they work with varying degrees depending on the equipment =
involved. You also will see that within datacenters or buildings where =
you may hit 1km, 2km or even 10km limits on a campus.
There should be plenty of vendors that will be happy to talk to you =
about active/passive cwdm/dwdm systems.
- Jared=
