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Home > Archive > alt.certification.cisco > February 2004 > Fractional T-1 circuit
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Fractional T-1 circuit
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| I'm looking for a information on how a fractional T-1 circuit put in place
by the provider:
is the "fraction" created by:
Adjusting the CIR
or
When the line is provisioned only a 'fraction" of the eligible timeslots ae
activated
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| Bernie 2004-02-19, 9:24 am |
| On Wed, 18 Feb 2004 21:46:11 -0800, "NoEcm"
<No_ECM@hotmail.com.NoSpam> wrote:
>I'm looking for a information on how a fractional T-1 circuit put in place
>by the provider:
>
>is the "fraction" created by:
>
>Adjusting the CIR
>
>or
>
>When the line is provisioned only a 'fraction" of the eligible timeslots ae
>activated
The latter is correct.
--Bernie
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There are 2 ways of providing a Frac-T1.
1) A Full T1 is delivered and the timeslots are capped
at whatever the Frac-T1 service is. T1-768 is 12 Timeslots.
That can be done by the Telco or the ISP (depending).
(NOTE; a T1 has 24 Channels).
2) The second way is to adjust the CIR. That can be done
by the ISP or Telco, depending on how the circuit was
designed. If its "real" Frame Relay or Point-to-Point with
FrameRelay Encaps.
Overall, your getting a T1 that is just being tiered so you don't
get more bandwidth than what your paying for. If you wish to
increase your bandwidth, its a quick upgrade.
"NoEcm" <No_ECM@hotmail.com.NoSpam> wrote in message
news:n4YYb.153$TL5.149414@news.uswest.net...
> I'm looking for a information on how a fractional T-1 circuit put in place
> by the provider:
>
> is the "fraction" created by:
>
> Adjusting the CIR
>
> or
>
> When the line is provisioned only a 'fraction" of the eligible timeslots
ae
> activated
>
>
| |
| Hansang Bae 2004-02-19, 3:26 pm |
| In article <n4YYb.153$TL5.149414@news.uswest.net>,
No_ECM@hotmail.com.NoSpam says...
> I'm looking for a information on how a fractional T-1 circuit put in place
> by the provider:
>
> is the "fraction" created by:
>
> Adjusting the CIR
>
> or
>
> When the line is provisioned only a 'fraction" of the eligible timeslots ae
> activated
The latter.
--
hsb
"Somehow I imagined this experience would be more rewarding" Calvin
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| codectide 2004-02-21, 4:24 pm |
| CIR is a mechanism to relieve congestion in a frame network. A Frac-T1 at
768k could have 0k CIR or 768k CIR but it would still be delivered as 12
timeslots. So, to echo what everyone else is saying, a Frac-T1s 768k
bandwidth is based on timeslots not CIR. CIR will determine how much of the
768k is guaranteed during times of congestion.
RCD
"Alby" <something@nowhere.com> wrote in message
news:49mdndr4SN5FaandRVn-sA@giganews.com...
>
>
> There are 2 ways of providing a Frac-T1.
>
> 1) A Full T1 is delivered and the timeslots are capped
> at whatever the Frac-T1 service is. T1-768 is 12 Timeslots.
> That can be done by the Telco or the ISP (depending).
> (NOTE; a T1 has 24 Channels).
>
> 2) The second way is to adjust the CIR. That can be done
> by the ISP or Telco, depending on how the circuit was
> designed. If its "real" Frame Relay or Point-to-Point with
> FrameRelay Encaps.
>
> Overall, your getting a T1 that is just being tiered so you don't
> get more bandwidth than what your paying for. If you wish to
> increase your bandwidth, its a quick upgrade.
>
>
>
>
> "NoEcm" <No_ECM@hotmail.com.NoSpam> wrote in message
> news:n4YYb.153$TL5.149414@news.uswest.net...
place[color=blue]
> ae
>
>
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| Bernie 2004-02-21, 10:24 pm |
| On Sat, 21 Feb 2004 14:23:53 -0600, "codectide"
<daugh4remove@charter.netthis> wrote:
>CIR is a mechanism to relieve congestion in a frame network. A Frac-T1 at
>768k could have 0k CIR or 768k CIR but it would still be delivered as 12
>timeslots. So, to echo what everyone else is saying, a Frac-T1s 768k
>bandwidth is based on timeslots not CIR. CIR will determine how much of the
>768k is guaranteed during times of congestion.
I'm surprised that no one has pointed out the more fundamental
difference between CIR and Fractional T1. One applies to a physical
circuit, and the other applies to a virtual circuit. And along lines
of how that applies to the above discussion, the CIR does not come
into play on your local loop Fractional T1. You aren't sharing that
particular circuit, so you can't have congestion on it. However, if
you are using FR, then your circuit terminates into the edge of a FR
cloud at a FR switch. The cloud is where you might have congestion
and CIR come into play. Your local loop is just your access link into
the network. So the physical link is how much possible bandwidth you
have in/out of the FR network, the CIR is how much guaranteed
bandwidth you have *through* the FR network.
>"Alby" <something@nowhere.com> wrote in message
>news:49mdndr4SN5FaandRVn-sA@giganews.com...
>place
>
--Bernie
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