DS-3 extended demarc photos

Following photos are from a customer's frac DS-3 (BW capped at 12mbps at
the DSU). The ISP is Sprint the LEC is SBC.

http://arneill-py.sacramento.ca.us/photos/ds3demarc-lr.jpg
This is the actual demarc; this is the back of the NIU, the two black
cables in slot 1 on the right go to CPE. There is no jack of course, as
the DS-3 uses a pair of 75-ohm cables. This would be a good reason why
it is improper to call a NIU a "smart jack", as this semantic
transgression only applies to T1 circuits mostly on the east coast.

http://arneill-py.sacramento.ca.us/photos/ds3niu-lr.jpg
The other side of it. There is only one ds-3 circuit so there is only
one card in the NIU chassis.

http://arneill-py.sacramento.ca.us/photos/ds3niu2-lr.jpg
A wider view where you can see the entire NIU chassis as well as the
fiber distribution panel. This is a 23-inch rack, not 19-inch.

http://arneill-py.sacramento.ca.us/photos/ds3optical-lr.jpg
This is an extended demarc, here you can see the equipment the LEC
brought into the customer's data room. They spliced the fiber in the
MPOE and installed their own 23-inch rack in the customer's room; this
is the preferred way of extending the demarc: move the NIU into
customer's territory. The optical platform is a Nortel OPTera Metro
3400.

Interesting points:
- This is a 1-tenant building, which helps a lot in having the demarc
extended. What also helps moving the demarc is a 120 degrees F
temperature in the MPOE and 68 degrees in the data room :smiley:
- The LEC brought an OC-12 ring (600 mbps) although the customer is
using only 12 mbps; room to grow.
- The equipment can't be powered by the span (power-over-fiber,
anyone?). The phone company does not trust anyone for power and even
though the entire room is on UPS and the customer also has a huge diesel
generator, they bring batteries. Note that like most telco gear
everything runs on redundant 48VDC power.

Michel.

Hi-res here:

http://arneill-py.sacramento.ca.us/photos/ds3demarc-hr.jpg
http://arneill-py.sacramento.ca.us/photos/ds3niu-hr.jpg
http://arneill-py.sacramento.ca.us/photos/ds3niu2-hr.jpg
http://arneill-py.sacramento.ca.us/photos/ds3optical-hr.jpg

In a message written on Fri, Jul 30, 2004 at 09:02:38AM -0700, Michel Py wrote:

- The equipment can't be powered by the span (power-over-fiber,
anyone?). The phone company does not trust anyone for power and even
though the entire room is on UPS and the customer also has a huge diesel
generator, they bring batteries. Note that like most telco gear
everything runs on redundant 48VDC power.

With Verizon I know you can have them use your -48VDC power. This
requires them to come out and inspect your power plant, and for you
to sign a couple of legal forms that amount to "we have no liability
if the power fails". MFS has used building power on several occasions
with just an inspection of the site.

Of course, this requires you to have -48VDC with batteries. If all
you have is AC, no matter how redundant, or DC with is fed directly
from rectifiers (no batteries on the -48VDC side) they will probably
still insist on batteries in their own rack.

So, it's not quite a "does not trust anyone", but for practical matters
in non-(telco)datacenter buildings that is true.