[Asterisk-Users] Where's the Fiber

[Jason Lixfeld]

A T1 or E1 or PRI are all made up of copper, at least the last mile  
is; that is the last portion between the Telco Demark and the CPE.  A  
T1 or E1 or PRI can be multiplexed into higher capacity circuits such  
as DS3, or OCx and run over transports like ATM and/or SONET.  These  
higher capacity circuits generally run over fiber at some point  
between point A and point Z.

On 17-Jun-06, at 7:29 PM, <dthurn at tstt.net.tt> <dthurn at tstt.net.tt>  
wrote:

> Where's the Fiber?
> I was reading about T1 lines and came across this statement.. It  
> basically said T1's are made up of copper...Wasn't T1 made up of  
> Fiber? Is the new trend to move T1 away from fiber and use copper?
>
> "
> http://www.pulsewan.com/data101/pdfs/t1basics.pdf#search='t1%20via% 
> 20copper'
>
> page 4
>
> T1 Physical Characteristics
>
> A T1 is physically made up of two balanced pairs of copper wire  
> (commonly known
>
> as twisted pair). The pairs are used in a full duplex configuration  
> where one pair
>
> transmits information and the other pair receives information.  
> Customer Premises
>
> Equipment (CPE) typically terminate a T1 with a RJ-48C jack. The  
> following
>
> illustration shows a typical T1 cable and interface."
>
>
>
>
>
> ----- Original Message ----- From: <dthurn at tstt.net.tt>
> To: "Asterisk Users Mailing List - Non-Commercial Discussion"  
> <asterisk-users at lists.digium.com>
> Sent: Saturday, June 17, 2006 5:08 AM
> Subject: Re: [Asterisk-Users] T1 Copper or T1 Fiber Line
>
>
>> Thanks for the inso...
>>
>> So T1 lines in the United States also use copper lines from the  
>> company to the telephone exchange in some installations?
>>
>> What's the benefit to the subscriber to this?
>>
>>
>> ----- Original Message ----- From: "Andrew Kohlsmith" <akohlsmith- 
>> asterisk at benshaw.com>
>> To: <asterisk-users at lists.digium.com>
>> Sent: Friday, June 16, 2006 9:11 AM
>> Subject: Re: [Asterisk-Users] T1 Copper or T1 Fiber Line
>>
>>
>>
>>> Any T1 I've seen in the last 3 years has actually been DS1-over- 
>>> HDSL2. What
>>> comes in to the building is a single pair of copper into the  
>>> smartjack, and
>>> then you have a traditional DSX1 to plug in to.  I don't think  
>>> "real" T1s (in
>>> the physical sense) have existed for years.
>>>
>>> Before DS1-over-HDSL2 the ones I had provisioned were DS1-over- 
>>> HDSL (2 copper
>>> pairs)... never had a real, genuine T1.
>>>
>>> But again... you don't get to play with that side of it.  You  
>>> order a T1, you
>>> get a smartjack that has a T1 jack (DSX1) on it and what's on the  
>>> other side
>>> is irrelevant.
>>>
>>> -A.
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