Model 

Description                  

Direction

Channels

Fibers

PDF

 DL401/402

 T1/E1 Transceiver

1

 1 or 2

 PDF

 DL403/403A

 4 Channel T1/E1 Transceiver

4

 1 or 2

 PDF

 DL404/404A

 T3/E3 Transceiver

1

 1 or 2

 PDF