Nortel Networks Circuit Card - Manual (Page 831)

NTRB21 DTI/PRI/DCH TMDI card Page 831 of 906
Circuit Card Description and Installation
Software description
Changes from the NTAK09 are required for the new trunk card and License
parameters are n service change and maintenance overlays. There is a change
to CardLAN to introduce a new CardLAN ID. The download of PSDL data
is also changed to handle a 32 bit download as well as existing 16 bit.
Hardware description
NTRB21 TMDI card
The NTRB21 TMDI card provides 1.5 MBits Digital Trunk Interface or
Primary Rate Interface functionality. It also has a built-in downloadable
D-channel.
The NTRB21 can be used with the NTAK09 DTI/PRI card (with the
NTBK51 downloadable D-channel daughterboard).
Figure 178 on page 832 shows a faceplate of the NTRB21 TMDI card.
Architecture
Signaling interface
The signaling interface performs an 8 Kbps signaling for all 24 channels and
interfaces directly to the DS-30X link. Messages transmitted in both
directions are three bytes long.
Interconnection
The interconnection to the carrier is by NTBK04, a 1.5 Mb 20 ft. carrier cable.
The NT8D97AX, a fifty-foot extension cable, is also available.