Two digital lines (see DASS) It is possible with the BRA service to use both lines at the same time with each line carrying up to 64kbits of information; the overall bandwidth used in this service being 128K.
BRA provides ISDN users with access to two 64Kbit/s data channels, It is defined in ITU-TS Recommendation I.420 which covers a 2B + D-channel where the B channel is a 64Kbit/s channel, and the D-channel is a 16Kbit/s signaling channel.
Basic Rate Access. One physical ISDN line providing two 64kbps B channels and one 16 kbps D channel.
An integrated services digital network (ISDN) connection consisting of two independent B channels (each 64 Kbps) and one D channel (16 Kbps). The basic rate access connection is given the notation (2B+D).
Basic Rate Access of ISDN; it implements two 64 kbps B channels + one 16 kbps D channel (2B+D), carrying user traffic and signaling information respectively to the user via twisted pair local loop.