Direct Inward Dialing (DID).
Will reproduce on-hook battery reversal for line maintenance.
The Station side card can only be powered locally, and provides 60 mA between the TX and RX pair to the Station side equipment. This power source provides no more than -48 Vdc.
On the CO side, the Central Office provides 60 mA DC current between the TX and RX pair to the CO unit, and is used to power the unit. As an alternative, power the card locally using a strapping.
Both line coding “AMI” and “B8ZS” are supported