The MM722 BRI media module provides two 4-wire S/T ISDN BRI 2B+D access ports with RJ-45 jacks. Each port interfaces to the central office at the ISDN T reference point. Data is transmitted in the same way as for the MM720 media module.
Note:
The MM722 media module does not support BRI stations or combining both B channels together to form a 128-kbps channel.