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We appreciate your understanding as we do our part to keep everyone healthy, while ensuring that we are supporting our current and future customers.


Demarcation and Extensions

When you order a T1 circuit a telco tech will come out to your building demarc and connect the circuit up to some point of demarcation.  That being said demarcation can mean a lot of different things.  Lots of demarc rooms have telco equipment on one side of the room and then a wall of blocks and biscuit jacks that have all of the circuits on them.  A typical T1 install involves installing the T1 card and patching the connection to it.  Then they’ll patch the circuit from the T1 card either to a 66 block or a RJ48x jack.  In a large building you’ll see the circuit being terminated on 66 blocks where the tech will ‘loop and tag’ the circuit.  They’ll usually leave excess wire on the loop and tie the circuit ID tag onto the loop wire.  Then when you come into the picture you can pull off the loop wire and extended the circuit from the 66 block to house pairs going to your suite where you can terminate in a RJ48x jack. 

If you don’t already have house pairs running to where you want to terminate the circuit and you aren’t low voltage certified call a wiring contractor.  There are all kinds of things to take into account when extending a circuit such as wire type, extension length, interference, binder groups, etc..   

T1 Pinouts and Wiring

Pin – Description
1 – RX Ring
2 – RX Tip
4 – TX Ring
5 – TX Tip

Default Programming Settings For Serial T1s
The default settings for T1s are as follows
Framing = ESF
Linecode = B8ZS
Encapsulation = HDLC (Cisco) 
Keepalives = 10 seconds
Timeslots = 24 timeslots at 64 
If you would like any of these settings changed, please contact the Network Operations Center or your Salesperson. 
T1 Loopback Wiring
Pin 1 needs to connect to Pin 4
Pin 2 needs to connect to Pin 5 
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