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NTRB21 DTI/PRI/DCH TMDI card Page 457 of 544
Option 11C and 11C Mini Technical Reference Guide
• echo canceler interface
• integrated trunk access (both D-channel and in-band A/B signaling can
be mixed on the same PRI)
• faceplate monitor jacks for T-1 interface
• configurable D-channel data rate with 64 Kbps, 56 Kbps or 64 Kbps
inverted.
• self-test
Software description
Changes from the NTAK09 are required for the new trunk card and ISM
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 on the Option 11C. The NTRB21 has a
built-in downloadable D-channel, and may occupy card slots 1-9 on the
Option 11C main cabinet.
Note 1: For CISPR B group cabinets, the active Clock Controller
(NTAK20) can only occupy slots 1-3. For FCC and/or CISPR A group
cabinets, this limitation does not exist - the Clock Controller can occupy
any available slot 1-9.
Note 2: The NTRB21 TMDI card requires that the Option 11C be
loaded with at least Release 24 software. If an Option 11C switch is
loaded with Release 24 (or later) software, the NTRB21 can be equipped
together with the NTAK09 DTI/PRI card (with the NTBK51
downloadable D-channel daughterboard).
Figure 57 on page 458 shows a faceplate of the NTRB21 TMDI card.