Okay here we go....
The first thing you need is to get the proper equipment. Any M13 mux will break out the individual t1’s from the ds3. The Adtran MX2800 should be okay but it will need the proper configuration. Unless you have a DC power plant you will want the AC power model. I would suggest you put it on an UPS also. You also want to get the M13 control card not the STS-1. You will be using M13 framing on the DS3 not C-bit. The DS3 side of the circuit is referred to as the high-speed side. The t1 side is referred to as the low-speed side. On the t1 side you will need to physically breakout the t1’s. For the MX2800 it appears you will need a couple of accessories. It looks like you will want to get the 64-pin amp cable to the RJ48 patch panel. Your t1’s will appear on the patch panel in order, DSX-1 channels 1-28.
The t1’s are individuals and need their framing and coding set for the type of t1 on a particular channel. For instance; channel 1 on the ds3 is an sf/ami t1 so you set the mux channel 1 for sf/ami. Channel 2 is esf/b8zs so you set channel 2 for esf/b8zs, etc……….. TL1 commands are pretty basic but can get complicated very quickly. Not all mux’s use TL1 but it looks like the MX2800 does. The Manual with the mux should have the commands in it.
Basically it’s fairly simple. You have a DS3 signal on two coax cables, TX and RX. Those cables will plug in to the DS3 mux. The mux will break out the T1’s respectively to the DSX-1 panel.
This is a T3 not a bunch of t’1s. Remember, your t1 orders are ordered to arrive to you on the DS3. When you order a t1, it’s CFA (carrier facility assignment) is ordered on your DS3 and mapped on the DLR (design layout record).
Good luck
