T1 short-haul vs. long-haul

Michel Py michel at arneill-py.sacramento.ca.us
Fri Jul 23 04:15:53 UTC 2004


> Christopher Woodfield wrote:
> In the interest of complicating things further, I think
> you have NIU and smartjack backwards in your explanation

You think, which is a good beginning. Seeing it with your own eyes might
be of some interest, NTM that doing it for a living for 20+ years may
give new an entire new outlook on it.

For the entertainment of non-american readers, wannabes, and rookies I
stopped by a T1 MPOE on my way home and took a few photos.

http://arneill-py.sacramento.ca.us/photos/smartjack1_lr.jpg
These are smartjacks, RJ48. Two are connected (grey cable, on the right,
going directly to the CSU/DSU). The red/violet pairs on the right come
from the NIU.

http://arneill-py.sacramento.ca.us/photos/smartjack2_lr.jpg
A little more detailed. As you can see, there is nothing smart about
these, it's a glorified patch panel.

http://arneill-py.sacramento.ca.us/photos/smartjack3_lr.jpg
>From a distance. The white punch blocks are called "66 blocks".

http://arneill-py.sacramento.ca.us/photos/smartjack4_lr.jpg
Sometimes the LEC does not install a smartjack, leaving the customer
and/or contractor to punch it, which typically produces a smartjack like
this :-)

http://arneill-py.sacramento.ca.us/photos/niu1_lr.jpg
A very common NIU with the Adtran modules. Each board is basically an
HDSL "modem", has lights and can be looped. Also present an RS-232 port
for configuring it with a laptop and the drop banana jacks to plug your
BERT tester.

http://arneill-py.sacramento.ca.us/photos/niu2_lr.jpg
Another variation of NIU, very common too. Both NIUs receive power from
the telco. 

Here are the hires:
http://arneill-py.sacramento.ca.us/photos/smartjack1_hr.jpg
http://arneill-py.sacramento.ca.us/photos/smartjack2_hr.jpg
http://arneill-py.sacramento.ca.us/photos/smartjack3_hr.jpg
http://arneill-py.sacramento.ca.us/photos/smartjack4_hr.jpg
http://arneill-py.sacramento.ca.us/photos/niu1_hr.jpg
http://arneill-py.sacramento.ca.us/photos/niu2_hr.jpg

If I have time tomorrow I will post some pictures of an extended DS-3
demarc at a remote site.

Michel.
 



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