I am investigating options for terminating many T1's with an objective
of high-density and easy scaleability. I am curious how others are
approaching this. Possible scenarios:
1. Cisco serial ports and rack CSU/DSU's. Exspensive. Lot of space.
2. MAX TNT for T1's connecting to a backbone Cisco. Theoretically up to 140
T1's in 1 small box with built-in CSU/DSU's. Unproven?
3. Cascade. Similair to TNT approach, very exspensive untill you reach
70+ T1's in a chassis.
4. Chanellized DS3. Don't know anything about it - can MFS provide circuits
this way via a DS3 handoff? No CSU/DSU required? Any other costs/issues?
Thanks for any ideas and experiences!
--stb
1. Cisco serial ports and rack CSU/DSU's. Exspensive. Lot of space.
Cisco has a channelized DS3 card. Wire once to dacs and provision in
software only.
2. MAX TNT for T1's connecting to a backbone Cisco. Theoretically up to 140
T1's in 1 small box with built-in CSU/DSU's. Unproven?
3. Cascade. Similair to TNT approach, very exspensive untill you reach
70+ T1's in a chassis.
Cascade has a channelized DS3 card as well. Good for combining many
customers who have a physical T1. Split out at the dacs.
4. Chanellized DS3. Don't know anything about it - can MFS provide circuits
this way via a DS3 handoff? No CSU/DSU required? Any other costs/issues?
Channelized DS3 stuff only seems to be useful for putting mulitple
customers on a single physical circuit. You need to be able to break it
out to the DS1 level for each customer. Perhaps MFS, PacBell, etc can do
this? It's probably just a matter of them defining that "product".
(I.E. Feed MFS a DS3 and they give a T1 to each of your customers.)
--Ben Kirkpatrick
Data Products, Electric Lightwave, NOC= 800.622.4354
-not speaking for ELI, not even speaking-
"Consciousness: that annoying time between naps."
> 1. Cisco serial ports and rack CSU/DSU's. Exspensive. Lot of space.
Cisco has a channelized DS3 card. Wire once to dacs and provision in
software only.
> 2. MAX TNT for T1's connecting to a backbone Cisco. Theoretically up to 140
> T1's in 1 small box with built-in CSU/DSU's. Unproven?
Vary.
> 3. Cascade. Similair to TNT approach, very exspensive untill you reach
> 70+ T1's in a chassis.
Cascade has a channelized DS3 card as well. Good for combining many
customers who have a physical T1. Split out at the dacs.
Yes tend to be big bucks, but is not that bad if you have many T1s to
terminate.
> 4. Chanellized DS3. Don't know anything about it - can MFS provide circuits
> this way via a DS3 handoff? No CSU/DSU required? Any other costs/issues?
Channelized DS3 stuff only seems to be useful for putting mulitple
customers on a single physical circuit. You need to be able to break it
out to the DS1 level for each customer. Perhaps MFS, PacBell, etc can do
this? It's probably just a matter of them defining that "product".
(I.E. Feed MFS a DS3 and they give a T1 to each of your customers.)
Yes, the Cascade and Cisco CT3 have a built in M13 built in. All you need
to do is order a DS3 HUB into the providers you want. What we do is run a
few DS3s into the COs in our area. You may want to run a DS3 into a few
telcos also. They can you get the best price for your customers.
DS3 HUBs can be a little on the high side, but they more then pay for
themselves. Say you run a DS3 HUB into Bell Atlantic, you spend around 3K
for the HUB. When you order your customers T1s you only order a 1/2
channel term. So you can more then pay for it with around 9 - 13 DS1s.
Nathan Stratton President, NetRail,Inc.
Actually, up in Boston, MFS derives all their pricing by taking the Nynex
end-to-end price and subtracting a certain percentage (at least 10%). I
may be mistaken but, I think they still do this even with the DS3 Hub.
You still pay two chan terms. A Nynex chan term is about $200 so this
ends up being quite an expense. The overall savings still makes it worth
while if you are going to sell a lot of T1s - if only for the headache,
you only need two aspirin at the end of the day instead of four.
Brian
US West !nterprise sells such a service, only for frame relay connections.
If you are in US West territory, or in a city where !nterprise has service,
then they can provision it (they are also the only carrier so far that does
not tarrif or sell Frame Relay based on CIR, simply port speed and local loop
only).
Operationally, I have typically experienced under 30 minute FR circuit
turn up times, from when I call the engineer. My current employer is not
a US West customer, but we will be in the future. Their engineers also are
not just familiar with the parameters you need to know to provision/configure
just Cisco equipment, a situation I have experienced with other carriers at
times (I've been told, "What do you NEED to know the DLCI for?", carrier
name with-held).
David Mercer
InfiNETways, Inc.
Tucson, AZ
Not quite true. We have two CT3's on order from USWest (not !nterprize)
for plain-ol' T1 aggragation...this in the WA/OR area.
TE
And, if you get this service over a SHNS (Self Healing Network Service)
ring that you can also get from USWest, you have extremely reliable links.
Dave.